2006 Chevrolet Corvette Z06

2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

2006 ACCESSORIES & EQUIPMENT

Instrument Panel, Gages, and Console - Corvette

SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS

Fastener Tightening Specifications

Specification
Application Metric English
Air Distribution Duct Retaining Screws 1.8 N.m 16 lb in
AMP Module Retaining Bolts 2.5 N.m 22 lb in
Center Air Outlet Retaining Screws 1.7 N.m 15 lb in
Console Door Hinge Retaining Nuts 2.4 N.m 21 lb in
Console Door Retaining Screws 1.9 N.m 17 lb in
Console Retaining Nuts 10 N.m 89 lb in
DIC Switch Retaining Screws 1.5 N.m 13 lb in
Driver Knee Bolster Bracket Retaining Screws 1.9 N.m 17 lb in
Floor Air Outlet Duct Retaining Screws 1.6 N.m 14 lb in
Head-Up Display Retaining Nuts 5 N.m 44 lb in
Head-Up Display-to-Steering Column Bracket
3 N.m 27 lb in
Retaining Screw
HVAC Control Retaining Screws 1.9 N.m 17 lb in
IPC to Steering Column Bracket Retaining Screws 1.5 N.m 13 lb in
I/P Cluster Retaining Screws 3 N.m 27 lb in
I/P Dimmer Switch Retaining Screws 1.5 N.m 13 lb in
I/P Pad to Driver Knee Bolster Outer Bracket
1.9 N.m 17 lb in
Screw
I/P Pad to I/P Center Support Screws 1.9 N.m 17 lb in
I/P Pad to LH and RH Hinge Pillar Screws 2.5 N.m 22 lb in
I/P Pad to Windshield Defroster Duct Screws 1.9 N.m 17 lb in
I/P Passenger Compartment Lower Retaining Bolts 12 N.m 106 lb in
I/P Passenger Compartment Side Retaining Screw 1.9 N.m 17 lb in
I/P Passenger Compartment Upper Retaining Screw 1.9 N.m 17 lb in
Negative Battery Cable Bolt 15 N.m 11 lb ft
Passenger Air Outlet Retaining Screws 1.7 N.m 15 lb in
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 2006 Chevrolet Corvette Z06
2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Passenger Knee Bolster Bracket Retaining Bolts 12 N.m 106 lb in

Passenger SIR Bracket Mounting Bolts 10 N.m 89 lb in
Passenger SIR Module Retaining Nuts 12 N.m 106 lb in
Radio Control Retaining Screws 2.5 N.m 22 lb in
Steering Column Bracket Mounting Bolts 10 N.m 89 lb in
Windshield Defroster Duct Retaining Screws 10 N.m 89 lb in

FUEL LEVEL SPECIFICATIONS

The information in this table is intended for use with the J 33431-C Signal Generator and
Instrument Panel Tester. See Special Tools. The fuel level sensor values represent the test values
to be used on the Signal Generator to drive the fuel gage display to the indicated positions.
Vehicles that require more than one fuel level sensor calculate gage position from many possible
resistance combinations of fuel levels between the two tanks. Therefore, the values in the table
may not correlate directly to readings taken from the vehicle primary or secondary sending units.

The values in the table are approximate values based on information obtained from properly
operating vehicles. Actual results may vary slightly.

Fuel Level Specifications

Fuel Level Sensor Fuel Level Sensor Left Fuel Level
Fuel Gage Right - Primary - Secondary Remaining
Display Resistance Volts Resistance Volts Fuel Level Parameter
3.8L (1.0
E 64.1 ohms 0.99 V 64.3 ohms 0.99 V 1.0 Gallons
gal)
22.3L (5.9
1/4 87.4 ohms 1.33 V 88.3 ohms 1.33 V 5.9 Gallons
gal)
37.5L (9.9
1/2 133.7 ohms 1.78 V 135.3 ohms 1.78 V 9.9 Gallons
gal)
14.1 53.4L (14.1
3/4 183.1 ohms 2.16 V 183.2 ohms 2.16 V
Gallons gal)
68.1-75.7L
225.1-248.5 2.41-2.50 225.2-248.5 2.41-2.50 18-20
F (18.0-20.0
ohms V ohms V Gallons
gal)

SCHEMATIC AND ROUTING DIAGRAMS

INSTRUMENT CLUSTER SCHEMATICS

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 2006 Chevrolet Corvette Z06
2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Fig. 1: Power, Ground, DLC and Indicators - Wiring Diagram

Courtesy of GENERAL MOTORS CORP.

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 2006 Chevrolet Corvette Z06
2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Fig. 2: Gages - Wiring Diagram

Courtesy of GENERAL MOTORS CORP.

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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Fig. 3: Messages - Wiring Diagram

Courtesy of GENERAL MOTORS CORP.

HEAD UP DISPLAY SCHEMATICS

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 2006 Chevrolet Corvette Z06
2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Fig. 4: Head Up Display - Wiring Diagram

Courtesy of GENERAL MOTORS CORP.

AUDIBLE WARNINGS SCHEMATICS

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 2006 Chevrolet Corvette Z06
2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Fig. 5: Audible Warnings - Wiring Diagram

Courtesy of GENERAL MOTORS CORP.

COMPONENT LOCATOR
INSTRUMENT PANEL, GAGES, AND CONSOLE COMPONENT VIEWS

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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Fig. 6: I/P Console Component View

Courtesy of GENERAL MOTORS CORP.

Callouts For Fig. 6

Callout Component Name
1 Head Up Display (HUD) (UV6)
2 Driver Information Center (DIC) Switch
3 Sunload Sensor Assembly
4 Hazard Switch
5 Radio
6 HVAC Control Module
7 Inflatable Restraint I/P Module Disable Switch
8 I/P Compartment Lamp
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 2006 Chevrolet Corvette Z06
2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

9 Heated Seat Switch - Passenger

10 Suspension Control Switch
11 Inflatable Restraint I/P Module Disable Switch LED
12 Auxiliary Power Outlet
13 Traction Control Switch
14 Cigar Lighter
15 Heated Seat Switch - Driver
16 Footwell Courtesy Lamp - Left
17 Ignition Mode Switch
18 Air Temperature Sensor - Inside
19 Inflatable Restraint Steering Wheel Module
20 Rear Compartment Lid Release Switch - Interior
21 Fuel Door Release Switch
22 I/P Dimmer Switch
23 Folding Top Control Switch (CM7)
24 Head Up Display (HUD) Switch (UV6)
25 Instrument Panel Cluster (IPC)

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 2006 Chevrolet Corvette Z06
2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Fig. 7: Lower Left Side of Engine

Courtesy of GENERAL MOTORS CORP.

Callouts For Fig. 7

Callout Component Name
1 Engine Oil Level/Temperature Sensor

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 2006 Chevrolet Corvette Z06
2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Fig. 8: Identifying Engine Components

Courtesy of GENERAL MOTORS CORP.

Callouts For Fig. 8

Callout Component Name
1 Fuel Injector 7
2 Ignition Coil 7
3 Fuel Injector 5
4 Ignition Coil 5
5 Fuel Injector 3
6 Ignition Coil 3
7 Fuel Injector 1
8 Ignition Coil 1
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 2006 Chevrolet Corvette Z06
2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

9 Engine Coolant Temperature (ECT) Sensor

10 Fuel Injector 2
11 Ignition Coil 2
12 Ignition Coil 4
13 Fuel Injector 4
14 Ignition Coil 6
15 Fuel Injector 6
16 Ignition Coil 8
17 Fuel Injector 8
18 Engine Oil Pressure (EOP) Sensor

Fig. 9: Fuel Tank

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 2006 Chevrolet Corvette Z06
2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Courtesy of GENERAL MOTORS CORP.

Callouts For Fig. 9

Callout Component Name
1 Fuel Tank - Left
2 Fuel Tank - Right
3 Evaporative (EVAP) Canister Vent Solenoid
4 Fuel Tank Pressure (FTP) Sensor
5 Fuel Level Sensor - Right
6 Fuel Pump and Sender Assembly
7 Fuel Level Sensor - Left

INSTRUMENT PANEL, GAGES, AND CONSOLE CONNECTOR END VIEWS

Driver Information Center (DIC) Switch

OEM: 12064871
Connector Part Information
Service: See Catalog

10-Way F Metri-Pack 150 Series (BU)

Pin Wire Color Circuit No. Function

A-B - - Not Used
C PU - DIC Fuel Switch Signal
D - - Not Used
Instrument Panel Lamps Supply
E OG -
Voltage

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 2006 Chevrolet Corvette Z06
2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

F YE - Ground
G D-BU - DIC Reset Switch Signal
H D-GN - DIC Gages Switch Signal
J WH - DIC Trip Switch Signal
K BN - DIC Options Switch Signal

Engine Oil Level/Temperature Sensor

OEM: 15326808
Connector Part Information
Service: 15306388

3-Way F GT 150 Series, Sealed (BK)

Pin Wire Color Circuit No. Function

A BN 1174 Oil Level Switch Signal
B D-GN/WH 357 Oil Temperature Sensor Signal
C TN 470 Low Reference

Engine Oil Pressure (EOP) Sensor

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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

OEM: 15477863
Connector Part Information
Service: 88988301

3-Way F GT 150 Series, Sealed (BK)

Pin Wire Color Circuit No. Function

1 BK 2755 Oil Pressure Sensor Low Reference
2 GY 2705 Oil Pressure Sensor 5-Volt Reference
3 TN/WH 331 Oil Pressure Sensor Signal

Fuel Level Sensor - Right

OEM: 15324862
Connector Part Information
Service: 15306441

4-Way F Metri-Pack 150.2 Series (BK)

Pin Wire Color Circuit No. Function

1 L-BU 1937 Fuel Level Sensor Signal
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

2 - - Not Used
3 BK/WH 850 Ground
4 BK 808 Low Reference

Fuel Pump and Sender Assembly

OEM: 15324862
Connector Part Information
Service: 15306441

4-Way F Metri-Pack 150.2 Series (BK)

Pin Wire Color Circuit No. Function

1 D-BU 1936 Fuel Level Sensor Signal - Secondary
2 GY 120 Fuel Pump Supply Voltage
3 BK 9531 Ground
4 BK 808 Low Reference

Head Up Display (HUD) (UV6)

OEM: 15394151
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Service: See Catalog

Connector Part Information

16-Way F Micro 64 (BN)

Pin Wire Color Circuit No. Function

1 RD/WH 1140 Battery Positive Voltage
2 YE 1127 HUD Class 2 Serial Data
3 D-GN/WH 817 Vehicle Speed Signal
4 WH 121 Engine Speed Signal
5 - - Not Used
6 BK 1450 Ground
7 BN 2383 HUD Image Up Signal
8 PK 2384 HUD Image Down Signal
9 BN 622 HUD Page Signal
10 TN 876 HUD Data Signal
11 L-GN 880 HUD Dimming Up Signal
12 YE 879 HUD Dimming Down Signal
13-16 - - Not Used

Head Up Display Switch (UV6)

OEM: 12064871
Connector Part Information
Service: 12101832

10-Way F Metri-Pack 150 Series (BU)

Pin Wire Color Circuit No. Function

A-B - - Not Used
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

C L-GN 880 HUD Dimming Up Signal

D YE 879 HUD Dimming Down Signal
Instrument Panel Lamp Supply Voltage
E BN 1244
-2
F BK 1450 Ground
G TN 876 HUD Data Signal
H BN 622 HUD Page Signal
J BN 2383 HUD Image Up Signal
K PK 2384 HUD Image Down Signal

Instrument Panel Cluster (IPC) C1

OEM: 15394150
Connector Part Information
Service: See Catalog

16-Way F Micro 64 (BK)

Pin Wire Color Circuit No. Function

Instrument Panel Lamp Dimming
1 BN/WH 230
Control
Instrument Panel Lamp Supply Voltage
2 BN 1244
-2
3-4 - - Not Used
5 GY 1036 IPC Class 2 Serial Data
6 - - Not Used
7 TN 470 Low Reference

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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

8 - - Not Used
9 BN 27 Hazard Flasher Signal
10-11 - - Not Used
Instrument Panel Lamps Dimmer
12 D-BU/WH 1495
Switch Down Signal
Instrument Panel Lamps Dimmer
13 D-GN 44
Switch Up Signal
14 PK/BK 1597 Dome Lamp Switch Signal
15 - - Not Used
16 D-GN/WH 357 Oil Temperature Sensor Signal

Instrument Panel Cluster (IPC) C2

OEM: 15394149
Connector Part Information
Service: See Catalog

16-Way F Micro 64 (GY)

Pin Wire Color Circuit No. Function

1 BK 1450 Ground
2 - - Not Used
3 RD/WH 1140 Battery Positive Voltage
4 - - Not Used
5 WH 121 Engine Speed Signal
6 D-GN/WH 817 Vehicle Speed Signal
7 BN 9 Park Lamp Supply Voltage
Windshield Washer Fluid Level Sensor
8 TN/WH 99
Signal
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

9-13 - - Not Used

14 BN/WH 419 Check Engine Indicator Control
15 L-BU 1134 Park Brake Switch Signal
16 PU 333 Brake Fluid Level Sensor Signal

DIAGNOSTIC INFORMATION AND PROCEDURES

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

DTC Description
DTC B0540 Speedometer Circuit
DTC B0560 Tachometer Circuit
DTC B3619 Head-Up Display (HUD) Change Page Switch Circuit
DTC B3620 Head Up Display (HUD) Information Up Switch Circuit
DTC B3621 DTC B3620 Head Up Display (HUD) Information Down
Switch Circuit
DTC B3634 Head Up Display (HUD) Dimming (Up) Switch Circuit
DTC B3659 Head Up Display (HUD) Dimming Down Switch Circuit
DTC B3744 Head Up Display (HUD) Mode Switch Circuit
DTC P0461 Fuel Level Sensor Performance
DTC P0462 Fuel Level Sensor 1 Circuit Low Voltage
DTC P0463 Fuel Level Sensor 1 Circuit High Voltage
DTC P0464 Fuel Level Sensor Circuit Intermittent
DTC P0521 Engine Oil Pressure (EOP) Sensor Performance
DTC P0522 Engine Oil Pressure (EOP) Sensor Circuit Low Voltage
DTC P0523 Engine Oil Pressure (EOP) Sensor Circuit High Voltage
DTC P0608 Vehicle Speed Output Circuit
DTC P0654 Engine Speed Output Circuit
DTC P1617 Engine Oil Level Switch Circuit
DTC P2066 Fuel Level Sensor 2 Performance
DTC P2067 Fuel Level Sensor 2 Circuit Low Voltage
DTC P2068 Fuel Level Sensor 2 Circuit High Voltage

DIAGNOSTIC STARTING POINT - INSTRUMENT PANEL, GAGES AND CONSOLE

Begin the instrument panel (I/P) system diagnosis with the appropriate Diagnostic System Check
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

- Vehicle. Refer to Diagnostic System Check - Vehicle in Vehicle DTC Information.

The Diagnostic System Check - Vehicle will provide the following information:

The identification of the control modules which command the system

The ability of the control modules to communicate through the serial data circuit

The identification of any stored DTCs and their status

The use of the Diagnostic System Check - Vehicle will identify the correct procedure for
diagnosing the system and where the procedure is located.

SCAN TOOL OUTPUT CONTROLS

Instrument Panel Cluster (IPC) Scan Tool Output Controls

Scan Tool Output Additional Menu
Control Selection(s) Description
The instrument panel cluster (IPC) dims the
Dimming Special Functions indicators, the odometer segments and the PRNDL
segments when you select dimming
The instrument panel cluster (IPC) illuminates the
Display(s) Test Special Functions indicators, the PRNDL segments, the odometer
segments when you select On.
The scan tool commands the IPC to sweep the
Coolant Gauge
Special Functions coolant gage between minimum and maximum when
Sweep Test
selected.
The scan tool commands the IPC to sweep the fuel
Fuel Gauge Sweep
Special Functions gage between minimum and maximum when
Test
selected.
The scan tool commands the IPC to sweep the oil
Oil Gauge Sweep
Special Functions gage between minimum and maximum when
Test
selected.
The scan tool commands the IPC to sweep the
Speedometer
Special Functions speedometer between minimum and maximum when
Gauge Sweep Test
selected.
The scan tool commands the IPC to sweep the
Tachometer Gauge
Special Functions tachometer between minimum and maximum when
Sweep Test
selected.
Special Functions The scan tool commands the IPC to sweep the volts
Volts Gauge gauge between minimum and maximum when
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Sweep Test selected.

Engine Control Module (ECM) Scan Tool Output Controls

Scan Tool Additional Menu
Output Control Selection(s) Description
Engine Output
MIL
Control The ECM illuminates the MIL when selected.

SCAN TOOL DATA LIST

The scan tool data lists contain all the instrument panel, gage, and console related parameters that
are available on the scan tool. The parameters in the list are arranged in alphabetical order. The
data list column indicates the location of the parameter within the scan tool menu selections.

Use the scan tool data lists as directed by a diagnostic table or in order to supplement the
diagnostic procedures. Begin all of the diagnostic procedures with Diagnostic System Check -
Vehicle in Vehicle DTC Information.

Use the scan tool data lists only after the following is determined:

There is no published DTC procedure nor published symptom procedure for the customer
concern.

The DTC or symptom procedure indicated by the diagnostic system check does not resolve
the customer concern.

The typical data values are obtained from a properly operating vehicle under the conditions
specified in the first row of the scan tool data list table. Comparison of the parameter values from
the suspect vehicle with the typical data values may reveal the source of the customer concern.

Engine Control Module (ECM)

Typical Data
Scan Tool Parameter Data List Units Displayed Value
Operating Conditions: Engine Idling/Normal Operating Temperature
Change Engine Oil Indicator
IPC ECM Data On/Off Off
Command
Inactive / Active /
Cruise Control Active IPC ECM Data Inactive
Invalid
Celsius 85-105°C (185-
ECT IPC ECM Data
(Fahrenheit) 220°F)
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Engine Oil Level Switch IPC ECM Data Ok/Low Ok

Varies w/oil
Engine Oil Pressure Sensor IPC ECM Data kPa (psi)
pressure
Engine Oil Temperature Celsius Varies w/oil
IPC ECM Data
Calculated (Fahrenheit) temperature
+/-100 RPM from
Engine Speed IPC ECM Data RPM
Desired Idle Speed
SHORT
GND/OPEN /
Engine Speed Circuit Status IPC ECM Data Ok
INCOMPLETE /
SHORT B+ / OK
Fuel Level Sensor - Left Tank IPC ECM Data Volts Varies w/fuel level
Fuel Level Sensor - Right Tank IPC ECM Data Volts Varies w/fuel level
Fuel Tank Level Remaining IPC ECM Data Liters (Gallons) Varies w/fuel level
Ignition Accessory Signal IPC ECM Data On/Off On
Ignition 1 Signal IPC ECM Data Volts 9-18 V
Low Engine Oil Level Indicator
IPC ECM Data On/Off Off
Command
Low EOP Indicator Command IPC ECM Data On/Off Off
SHORT
GND/OPEN /
MIL Circuit Status IPC ECM Data Ok
INCOMPLETE /
SHORT B+ / OK
MIL Command IPC ECM Data On/Off Off
Non-Driven Wheel Speed IPC ECM Data Km/h (mph) Varies
Odometer IPC ECM Data km/miles Varies
Skip Shift Lamp Command (If
IPC ECM Data On/Off Off
Equipped)
OK / SHORT
GND / SHORT
Vehicle Speed Circuit Status IPC ECM Data
B+ /
INCOMPLETE
kilometers per hour
Vehicle Speed Sensor IPC ECM Data 0 km/h (0 mph)
(miles per hour)

Instrument Panel Cluster (IPC)

Typical Data
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Scan Tool Parameter Data List Units Displayed Value

Operating Conditions: Ignition ON/Engine OFF/Park Brake Unapplied
1-4 Shift Lamp IPC Input/Output Off/On Off
ABS Telltale IPC Input/Output Off/On Off
Air Bag Indicator Command IPC Input/Output Off/On Off
Average Fuel Economy IPC Data 2 Liters (Gallons) Varies
Average Speed IPC Data 1 Km/h (mph) Km/h (mph)
Battery Voltage Signal IPC Data 1 Volts 9-18 Volts
Brake Fluid Level Switch IPC Input/Output Off/On Off
Brake Warning Indicator
IPC Input/Output Off/On Off
Command
Dim Down Switch IPC Input/Output Inactive/Active Inactive
Dim Up Switch IPC Input/Output Inactive/Active Inactive
Dome Lamp Switch IPC Input/Output Off/On Off
ECT IPC Data 1 °C (°F) Varies
Engine Oil Life IPC Data 1 0-100% Varies w/oil life
Varies w/oil
Engine Oil Pressure IPC Data 1 kPa (psi)
pressure
+/-100 RPM from
Engine Speed Signal IPC Data 1 RPM Desired Idle
Speed
Front Fog Indicator Command IPC Input/Output Off/On Off
Fuel Gauge Select Sw. IPC Input/Output Released/Depressed Released
Varies w/fuel
Fuel Level IPC Data 1 0-100%
level
Fuel Range IPC Data 2 Kilometers (Miles) Varies
Gauge Switch IPC Input/Output Inactive/Active Inactive
Headlamps On Indicator IPC Input/Output Off/On Off
High Beam Indicator Command IPC Input/Output Off/On Off
Inst. Fuel Economy IPC Data 2 Liters (Gallons) Varies
Left Turn Signal IPC Input/Output Off/On Off
Varies w/tire
LF Tire Pressure IPC Data 1 kPa (psi)
pressure
Low Tire Press. Lamp IPC Input/Output Off/On Off
Low Traction Lamp Command IPC Input/Output Off/On Off
Varies w/tire
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

LR Tire Pressure IPC Data 1 kPa (psi) pressure

Options Switch IPC Input/Output Inactive/Active Inactive
Odometer IPC Data 2 Kilometers (Miles) Varies (0-99,999)
Park Brake Switch IPC Input/Output Released/Applied Released
Park Lamps Signal IPC Input/Output Off/On Off
Rear Fog Indicator Command IPC Input/Output Off/On Off
Reset Switch IPC Input/Output Inactive/Active Inactive
Varies w/tire
RF Tire Pressure IPC Data 1 kPa (psi)
pressure
Right Turn Signal IPC Input/Output Off/On Off
Varies w/tire
RR Tire Pressure IPC Data 1 kPa (psi)
pressure
Seat Belt Indicator Command IPC Input/Output Off/On Off
Security Indicator Command IPC Input/Output Off/On Off
Trip Odometer A/B Switch IPC Input/Output Off/On Off
Trip Odometer A IPC Data 2 Kilometer/Miles Varies
Trip Odometer B IPC Data 2 Miles Varies
Trip Odometer A IPC Data 2 Kilometers Varies
Trip Odometer B IPC Data 2 Kilometers Varies
kilometers per hour
Vehicle Speed Signal IPC Data 1 0 km/h (0 mph)
(miles per hour)
Windshield Washer Fluid
IPC Input/Output Low Fluid/Ok Ok
Switch

HUD
Typical Data
Scan Tool Parameter Data List Units Displayed Value
Operating Conditions: Ignition ON/Engine OFF/Park Brake Unapplied
Adjust Display Down Switch IPC HUD Data Inactive/Active Inactive
Adjust Display Up Switch IPC HUD Data Inactive/Active Inactive
Battery Voltage Signal IPC HUD Data Volts 9-16 V
English Metric Status IPC HUD Data English/Metric English
English, French,
German, Italian,
Language IPC HUD Data Varies w/selection
Spanish, or
Japanese
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Not Present /
Navigation Present IPC HUD Data Not Present
Present
Page Switch IPC HUD Data Inactive/Active Inactive

SCAN TOOL DATA DEFINITIONS

1-4 Shift (Manual Trans Only)

The scan tool displays On/Off. This is the status of the manual transmission range as
determined by the engine control module (ECM).

ABS Telltale

The scan tool displays On/Off. This is the state of the ABS telltale as commanded by the
instrument panel cluster (IPC).

Adjust Display Down Switch

The scan tool displays Inactive/Active. This is the state of the HUD Display Down Switch.
Active is displayed when switch is selected.

Adjust Display Up Switch

The scan tool displays Inactive/Active. This is the state of the HUD Display Up Switch. The
scan tool displays Inactive/Active.

Air Bag Indicator Command

The scan tool displays On/Off. This is the state of the air bag indicator as commanded by the
sensing and diagnostic module (SDM).

Average Fuel Economy

The scan tool displays Liters (Gallons). This is the average fuel economy information as
calculated by the ECM.

Average Speed

The scan tool displays Km/h (mph). This is the average vehicle speed information as
calculated by the IPC in miles travelled per hour of ignition-on time.

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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Battery Voltage Signal

The scan tool displays 0-19 volts. This is the voltage measured at the battery positive
voltage circuit of the HUD.

Battery Voltage Signal

The scan tool displays 0-19 volts. This is the voltage measured at the battery positive
voltage circuit of the IPC.

Brake Fluid Level Switch

The scan tool displays On/Off. This is status of brake fluid level switch as monitored by the
IPC

Brake Warning Indicator Command

The scan tool displays Off/On. This is the state of the brake warning indicator as
commanded by the IPC.

Change Engine Oil Indicator

The scan tool displays On/Off. This is the state of the change engine oil indicator as
commanded by the IPC. The IPC receives a class 2 message from the ECM indicating the
engine oil life.

Cruise Control Active

The scan tool displays Inactive/Active. This is the state of the cruise control switch as
determined by the ECM.

Dim Down Switch

The scan tool displays Inactive/Active. The scan tool displays the state of the Dimmer Down
Switch as commanded by the IPC.

Dim Up Switch

The scan tool displays Inactive/Active. The scan tool displays the state of the Dimmer Up
Switch as commanded by the IPC.

Dome Lamp Switch

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The scan tool displays On/Off. The IPC receives a class 2 message from the BCM indicating
the dome lamp switch status.

ECT

The scan tool displays -40 to 151°C (-40 to +304°F). The ECM monitors the voltage at the
signal circuit of the engine coolant temperature sensor. The voltage is inversely proportional
to the engine coolant temperature.

ECT

The scan tool displays °Celsius (°Fahrenheit). The IPC displays the engine coolant
temperature as determined by the ECM. The ECM sends a class 2 message to the IPC
indicating the engine coolant temperature.

Engine Oil Level Switch

The scan tool displays Ok/Low. The ECM monitors the engine oil level switch. The IPC
receives a serial data message from the ECM indicating the engine oil level.

Engine Oil Life

The scan tool displays 0-100%. This is the engine oil life index as calculated by the ECM.

Engine Oil Pressure Sensor

The scan tool displays kPa or psi. The scan tool displays the current engine oil pressure as
calculated by the ECM.

Engine Oil Pressure

The scan tool displays kPa (psi). The scan tool displays the IPC engine oil pressure
information. The IPC receives a class 2 message from the IPC indicating the engine oil
pressure.

English Metric Status

The scan tool displays English or Metric. The scan tool displays vehicle information in
English or Metric system as selected from the IPC.

Engine Oil Temperature Calculated

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The scan tool displays Celsius or Fahrenheit. The scan tool displays the current engine oil
temperature as calculated by the ECM.

Engine Speed Circuit Status

The scan tool displays SHORT GND/OPEN, INCOMPLETE, SHORT B+, OK. This is the
status of the engine speed signal circuit as monitored by the ECM.

Engine Speed

The scan tool displays 0-9999 RPM. Engine speed is computed by the ECM from the
ignition reference input. It should remain close to desired idle under various engine loads
with the engine idling.

Engine Speed Signal

The scan tool displays 0-9999 RPM. Engine speed is computed by the IPC via a discrete
input from the ECM.

Front Fog Indicator Command

The scan tool displays On/Off. This is the state of the fog lamp indicator as commanded by
the IPC.

Fuel Gauge Select Sw

The scan tool displays Released/Depressed. This is the state of the fuel gauge select switch
as controlled from the switch.

Fuel Level

The scan tool displays 0-100%. The IPC displays the approximate value of fuel remaining in
the gas tank. The ECM calculates the amount of fuel in the gas tank based on the fuel level
sensors and sends the information via class 2 to the IPC.

Fuel Level Sensor - Left Tank

The scan tool displays 0-5 volts. The scan tool displays the voltage at the signal circuit of
the left fuel level sensor as calculated by the ECM.

Fuel Level Sensor - Right Tank

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The scan tool displays 0-5 volts. The scan tool displays the voltage at the signal circuit of
the right fuel level sensor as calculated by the ECM.

Fuel Range

The scan tool displays Km/h (mph). The IPC displays the approximate range of the fuel
remaining in the gas tank. The ECM calculates the distance of the remaining fuel in the gas
tank based on the fuel level sensor information.

Fuel Tank Level Remaining

The scan tool displays the approximate value of fuel remaining in the gas tank in liters or
gallons. The ECM calculates the amount of fuel remaining in the tanks based on the signal
circuits of the fuel level sensors.

Gauge Switch

The scan tool displays Inactive/Active. This is the status of the gage switch as determined by
the IPC.

Headlamps On Indicator

The scan tool displays On/Off. This is the status of the headlamps indicator as determined by
the IPC. The IPC illuminates the indicator when the park lamps are On.

High Beam Indicator Command

The scan tool displays On/Off. This is the status high beam indicator as determined by the
IPC. The IPC receives a class 2 message from the BCM indicating the high beam status.

Ignition Accessory Signal

The scan tool displays Off/On. The scan tool displays the ignition accessory signal status of
the ECM.

Ignition 1 Signal

The scan tool displays Volts. The scan tool displays the ignition 1 input voltage to the ECM.

Inst. Fuel Economy

The scan tool displays Liters (Gallons). This is the Inst. Fuel Economy information as
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calculated by the ECM.

Language

The scan tool displays English, French, German, Italian, Spanish or Japanese. This is the
language selected for the HUD.

Left Turn Signal

The scan tool displays On/Off. This is the state of the left turn indicator as determined by the
IPC. The IPC receives a class 2 message from the BCM indicating the status of the left turn
indicator.

LF Tire Pressure

The scan tool displays kPa (psi). This is the left front tire pressure information received
class 2 by the IPC from the tire pressure module.

Low Engine Oil Level Indicator Command

The scan tool displays On/Off. This is the state of the low engine oil indicator as determined
by the IPC. The IPC receives a class 2 message indicating the engine oil level.

Low EOP Indicator Command

The scan tool displays On/Off. This is the state of the low EOP indicator as determined by
the IPC. The IPC receives a class 2 message from the ECM indicating the engine oil
pressure.

Low Tire Press. Lamp

The scan tool displays On/Off. This is the state of the low tire pressure lamp as commanded
by the IPC.

Low Traction Lamp Command

The scan tool displays On/Off. This is the state of the low traction lamp as commanded by
the IPC.

LR Tire Pressure

The scan tool displays kPa (psi). This is the left rear tire pressure information received class
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2 by the IPC from the tire pressure module.

MIL Circuit Status

The scan tool displays SHORT GND/OPEN, INCOMPLETE, SHORT B+, OK. The scan
tool will display the status of the MIL circuit as commanded by the ECM.

MIL Command

The scan tool displays Off/On. This is the commanded state of the malfunction indicator
lamp (MIL) by the ECM. The malfunction indicator lamp should be On when the scan tool
indicates the MIL Command is On.

Navigation Present

The scan tool displays Present/Notpresent. This is the state of the vehicle navigation system
as determined by the IPC.

Non - Driven Wheel Speed

The scan tool displays Km/h (miles). This is the vehicle non-driven wheel speed as
determined by the ECM.

Odometer

The scan tool displays kilometers or miles. This is the total accumulated miles of the vehicle
as calculated by the ECM.

Odometer

The scan tool displays kilometers or miles. This is the total accumulated miles of the vehicle
as displayed by the IPC.

Options Switch

The scan tool displays Inactive/Active. This is the state of the DIC Option Switch as
detected by the IPC.

Page Switch

The scan tool displays Inactive/Active. This is the state of the HUD page switch detected by
the IPC.
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Park Brake Switch

The scan tool displays Released/Applied. This is the state of the park brake switch as
detected by the IPC.

Park Lamps Signal

The scan tool displays On/Off. This is the state of the park lamps signal as detected by the
IPC.

Rear Fog Indicator Command

The scan tool displays On/Off. This is the state of the rear fog indicator as detected by the
IPC.

Reset Switch

The scan tool displays Inactive/Active. This is the state of the DIC reset switch as detected
by the IPC.

RF Tire Pressure

The scan tool displays kPa (psi). This is the right front tire pressure information received
class 2 by the IPC from the tire pressure module.

RR Tire Pressure

The scan tool displays kPa (psi). This is the right rear tire pressure information received
class 2 by the IPC from the tire pressure module.

Right Turn Signal

The scan tool displays On/Off. This is the state of the right turn indicator as determined by
the IPC. The IPC receives a class 2 message from the BCM indicating the status of the left
turn indicator.

Seat Belt Indicator Command

The scan tool displays On/Off. This is the state of the seat belt indicator as determined by
the SDM.

Security Indicator Command

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The scan tool displays On/Off. The IPC receives a class 2 message from the BCM requesting
the illumination of the security indicator.

Skip Shift Lamp Command

The scan tool displays On/Off. This is the state of the skip shift indicator as determined by
the ECM. The IPC receives a class 2 message requesting illumination.

Trip Odometer A/B Switch

The scan tool displays On/Off. This is the state of the trip odometer A/B switch of the IPC.

Trip Odometer A

The scan tool displays kilometers (miles). This is the total accumulated kilometers (miles) of
Trip Odometer A as displayed by the IPC.

Trip Odometer B

The scan tool displays kilometers (miles). This is the total accumulated kilometers (miles) of
Trip Odometer B as displayed by the IPC.

Vehicle Speed Sensor

The scan tool displays 0-255 km/h (0-155 mph). This is the vehicle speed as calculated from
the ECM.

Vehicle Speed Signal

The scan tool displays 0-255 km/h (0-155 mph). The IPC calculates the vehicle speed signal
via a discrete input from the ECM.

Windshield Washer Fluid Switch

The scan tool displays Low Fluid/Ok. This is the state of the windshield washer fluid as
detected by the IPC via discreet input.

DTC B0540

Circuit Description

The engine control module (ECM) creates the vehicle speed signal by pulsing the signal circuit to
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ground at a rate of 4K PPM. The instrument panel cluster (IPC) converts the 4K PPM signal to a
speedometer position. The IPC also receives a class 2 message from the ECM indicating the
vehicle speed. The IPC uses this class 2 message for diagnostic purposes.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B0540 Speedometer Circuit

Conditions for Running the DTC

The IPC receives a class 2 message from the ECM indicating that the vehicle speed is
greater than 10 km/h (6 mph).

The ignition voltage is between 9-18 volts.
Conditions for Setting the DTC

The IPC does not detect a 4K PPM signal on the vehicle speed signal circuit.

The condition above must be present for a minimum of 5 seconds.
Action Taken When the DTC Sets

The IPC stores a DTC B0540 in memory.

Conditions for Clearing the DTC

The history DTC clears after 100 malfunction free warm-up cycles.

The DTC becomes history when the conditions for setting the DTC are no longer present.

The IPC receives the clear code command from the scan tool.

DTC B0540
Step Action Values Yes No
Schematic Reference: Instrument Cluster Schematics
Connector End View Reference: Master Electrical Component List
Did you perform the Diagnostic System Go to
Check - Vehicle? Diagnostic
1 - System
Check -
Go to Step 2 Vehicle
1. Turn the ignition OFF.
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2. Disconnect the engine control

module (ECM) connector C1.
3. Turn the ignition ON, with the
engine OFF.
2 4. Measure the voltage from the vehicle 9V
speed signal circuit of the ECM to a
good ground.

Does the voltage measure greater than the

specified value? Go to Step 3 Go to Step 4
Test the vehicle speed signal circuit for a
short to voltage. Refer to Circuit Testing
3 -
and Wiring Repairs .
Did you find and correct the condition? Go to Step 9 Go to Step 5
Test the vehicle speed signal circuit for an
open or for a short to ground. Refer to
4 -
Circuit Testing and Wiring Repairs .
Did you find and correct the condition? Go to Step 9 Go to Step 6
Inspect for poor connections at the harness
connector of the ECM. Refer to Testing
5 for Intermittent Conditions and Poor -
Connections and Connector Repairs .
Did you find and correct the condition? Go to Step 9 Go to Step 7
Inspect for poor connection at the harness
connector of the instrument panel cluster
(IPC). Refer to Testing for Intermittent
6 -
Conditions and Poor Connections and
Connector Repairs .
Did you find and correct the condition? Go to Step 9 Go to Step 8
Replace the ECM. Refer to Control
Module References for replacement,
7 -
setup, and programming.
Did you complete the replacement? Go to Step 9 -
Replace the IPC. Refer to Control
Module References for replacement,
8 -
setup, and programming.
Did you complete the replacement? Go to Step 9 -
1. Use the scan tool in order to clear the
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DTCs.
2. Operate the vehicle within the
9 Conditions for Running this DTC. -

Does the DTC reset? Go to Step 2 System OK

DTC B0560

Circuit Description

The engine control module (ECM) creates the engine speed signal by pulsing the signal circuit to
ground at the rate of 2 pulses per engine revolution. The instrument panel cluster (IPC) converts
the signal to a tachometer position. The IPC also receives a class 2 message from the ECM
indicating the engine speed. The IPC uses this class 2 message for diagnostic purposes.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B0560 Tachometer Circuit

Conditions for Running the DTC

The IPC receives a class 2 message from the ECM indicating that the engine speed is greater
than 800 RPM.

The ignition voltage is between 9-18 volts.
Conditions for Setting the DTC

The IPC does not detect a 2 pulses per engine revolution signal on the engine speed signal
circuit.

The above condition is present for at least 5 seconds.
Action Taken When the DTC Sets

The IPC stores a DTC B0560 in memory.

Conditions for Clearing the DTC

A history DTC clears after 100 malfunction free warm-up cycles.

The DTC becomes history when the conditions for setting the DTC are no longer present.

The IPC receives the clear code command from the scan tool.
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DTC B0560
Step Action Values Yes No
Schematic Reference: Instrument Cluster Schematics
Connector End View Reference: Master Electrical Component List
Did you perform the Diagnostic System Go to
Check - Vehicle? Diagnostic
1 - System
Check -
Go to Step 2 Vehicle
1. Install a scan tool.
2. Start the engine.
3. With the scan tool, observe the
Engine Speed parameter in the Go to Testing
2 engine control module (ECM) - for
Engine Data 1 data list. Intermittent
Conditions
Does the Engine Speed parameter match and Poor
the tachometer display? Connections Go to Step 3
1. Turn the ignition OFF.
2. Disconnect the ECM connector C1.
3. Turn the ignition ON, with the
engine OFF.
3 4. Measure the voltage from the engine 9V
speed signal circuit of the ECM to a
good ground.

Does the voltage measure greater than the

specified value? Go to Step 4 Go to Step 5
Test the engine speed signal circuit for a
short to voltage. Refer to Circuit Testing
4 -
and Wiring Repairs .
Did you find and correct the condition? Go to Step 10 Go to Step 6
Test the engine speed signal circuit for an
open or for a short to ground. Refer to
5 -
Circuit Testing and Wiring Repairs .
Did you find and correct the condition? Go to Step 10 Go to Step 7
Inspect for poor connections at the
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harness connector of the ECM. Refer to

Testing for Intermittent Conditions
6 and Poor Connections and Connector -
Repairs .
Did you find and correct the condition? Go to Step 10 Go to Step 8
Inspect for poor connections at the
harness connector of the instrument panel
cluster (IPC). Refer to Testing for
7 -
Intermittent Conditions and Poor
Connections and Connector Repairs .
Did you find and correct the condition? Go to Step 10 Go to Step 9
Replace the ECM. Refer to Control
Module References for replacement,
8 -
setup, and programming.
Did you complete the replacement? Go to Step 10 -
Replace the IPC. Refer to Control
Module References for replacement,
9 -
setup, and programming.
Did you complete the replacement? Go to Step 10 -
1. Use the scan tool in order to clear
the DTCs.
10 2. Operate vehicle within the -
Conditions for Running this DTC.

Does the DTC reset? Go to Step 2 System OK

DTC B3619

Circuit Description

The head-up display (HUD) monitors the page switch signal circuit in order to perform the switch
functions. When the HUD page switch is depressed and the ignition is in the RUN position, the
switch signal to the HUD is low. When the HUD detects that the HUD page switch is low for
greater than 60 seconds, DTC B3619 sets.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3619 Head-Up Display (HUD) Change Page Switch Circuit

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Conditions for Running the DTC

The ignition is RUN.

Conditions for Setting the DTC

The HUD detects that the HUD page switch signal circuit is low for greater than 60 seconds.
Action Taken When the DTC Sets

The HUD ignores the malfunctioning switch circuit.

Conditions for Clearing the DTC

The current DTC clears when fault is no longer present but all history codes remain.

The HUD receives a clear code command from the scan tool.

DTC B3619
Step Action Yes No
Schematic Reference: Head Up Display Schematics
Did you perform the Diagnostic System Check Go to Diagnostic
1 - Vehicle? System Check -
Go to Step 2 Vehicle
1. Turn On the ignition, with the engine ON. Go to Testing
2. Press the HUD page switch to change for Intermittent
between modes displayed on the HUD. Conditions and
2
Poor
Does the HUD page switch operate correctly? Connections in
Wiring Systems Go to Step 3
1. Turn OFF the ignition.
2. Install a scan tool.
3. Turn ON the ignition, with the engine
OFF.
4. With the scan tool, observe the Page
3 Switch parameter in the IPC HUD Data
List.
5. Press and release the HUD page switch
and observe the Page Switch parameter
display ACTIVE and INACTIVE on the
scan tool when pressed and released.
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Does the HUD page switch parameter display

only ACTIVE when the page switch is pressed
and released?
Go to Step 4 Go to Step 6
Test the HUD page switch signal circuit for a
short to ground. Refer to Circuit Testing and
4
Wiring Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 5
Inspect for poor connections at the HUD
switch. Refer to Testing for Intermittent
5 Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 7
Inspect for poor connections at the HUD
module. Refer to Testing for Intermittent
6 Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 8
Replace the HUD switch. Refer to Switch
Replacement - Ignition and Start, DIC
7 -
Display and HUD Dimmer.
Did you complete the replacement? Go to Step 9
Replace the HUD. Refer to Control Module
References in Computer/Integrating Systems
8 -
for replacement, setup, and programming.
Did you complete the replacement? Go to Step 9
1. Use the scan tool in order to clear the
DTCs.
2. Operate the vehicle within the Conditions
9 for Running the DTC as specified in the
supporting text.

Does the DTC reset? System OK Go to Step 2

DTC B3620

Circuit Description

The head-up display (HUD) monitors the HUD information-up switch signal circuit in order to
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perform the switch functions. When the HUD information-up switch is depressed and the ignition
is in the RUN position, the switch signal to the HUD is low. When the HUD detects that the HUD
information-up switch signal is low for greater than 60 seconds, DTC B3620 sets.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3620 Head Up Display (HUD) Information Up Switch Circuit

Conditions for Running the DTC

The ignition is RUN.

Conditions for Setting the DTC

The HUD detects that the HUD information up switch signal circuit is low for greater than 60
seconds.
Action Taken When the DTC Sets

The HUD ignores the malfunctioning switch circuit.

Conditions for Clearing the DTC

The current DTC clears when fault is no longer present but all history codes remain.

The HUD receives a clear code command from the scan tool.

DTC B3620
Step Action Yes No
Schematic Reference: Head Up Display Schematics
Did you perform the Diagnostic System Check Go to Diagnostic
1 - Vehicle? System Check -
Go to Step 2 Vehicle
1. Turn On the ignition, with the engine ON. Go to Testing
2. Press the HUD image up switch to adjust for Intermittent
2 the HUD. Conditions and
Poor
Does the HUD image up switch operate Connections in
correctly? Wiring Systems Go to Step 3
1. Turn OFF the ignition.
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2. Install a scan tool.

3. Turn ON the ignition, with the engine
OFF.
4. With the scan tool, observe the HUD
Adjust Display Up Switch parameter in
the IPC HUD Data List.
3 5. Press and release the HUD image up
switch and observe the HUD Adjust
Display Up Switch parameter.

Does the HUD Adjust Display Switch

parameter display only ACTIVE on the scan
tool when the HUD image up switch is pressed
and released? Go to Step 4 Go to Step 6
Test the HUD image up switch signal circuit for
a short to ground. Refer to Circuit Testing and
4
Wiring Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 5
Inspect for poor connections at the HUD
switch. Refer to Testing for Intermittent
5 Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 7
Inspect for poor connections at the HUD
module. Refer to Testing for Intermittent
6 Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 8
Replace the HUD switch. Refer to Switch
Replacement - Ignition and Start, DIC
7 -
Display and HUD Dimmer.
Did you complete the replacement? Go to Step 9
Replace the HUD. Refer to Control Module
References in Computer/Integrating Systems
8 -
for replacement, setup, and programming.
Did you complete the replacement? Go to Step 9
1. Use the scan tool in order to clear the

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DTCs.
2. Operate the vehicle within the Conditions
9 for Running the DTC as specified in the
supporting text.

Does the DTC reset? System OK Go to Step 2

DTC B3621

Circuit Description

The head-up display (HUD) monitors the HUD information-down switch signal circuit in order to
perform the switch functions. When the HUD information-down switch is depressed and the
ignition is in the RUN position, the switch signal to the HUD is low. When the HUD detects that
the HUD information-down switch signal is low for greater than 60 seconds, DTC B3621 sets.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3620 Head Up Display (HUD) Information Down Switch Circuit

Conditions for Running the DTC

The ignition is RUN.

Conditions for Setting the DTC

The HUD detects that the HUD information down switch signal circuit is low for greater than 60
seconds.
Action Taken When the DTC Sets

The HUD ignores the malfunctioning switch circuit.

Conditions for Clearing the DTC

The current DTC clears when fault is no longer present but all history codes remain.

The HUD receives a clear code command from the scan tool.

DTC B3621
Step Action Yes No

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Schematic Reference: Head Up Display Schematics

Did you perform the Diagnostic System Check Go to Diagnostic
1 - Vehicle? System Check -
Go to Step 2 Vehicle
1. Turn On the ignition, with the engine ON. Go to Testing
2. Press the HUD image down switch to for Intermittent
2 adjust the HUD. Conditions and
Poor
Does the HUD image down switch operate Connections in
correctly? Wiring Systems Go to Step 3
1. Turn OFF the ignition.
2. Install a scan tool.
3. Turn ON the ignition, with the engine
OFF.
4. With the scan tool, observe the HUD
Adjust Display Down Switch parameter in
the IPC HUD Data List.
3 5. Press and release the HUD image down
switch and observe the HUD Adjust
Display Down Switch parameter in the
scan tool.

Does the HUD Adjust Display Down Switch

parameter display only ACTIVE on the scan
tool when the HUD image down switch is
pressed and released? Go to Step 4 Go to Step 6
Test the HUD image down switch signal circuit
for a short to ground. Refer to Circuit Testing
4
and Wiring Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 5
Inspect for poor connections at the HUD
switch. Refer to Testing for Intermittent
5 Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 7
Inspect for poor connections at the HUD
module. Refer to Testing for Intermittent
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Conditions and Poor Connections and

6 Connector Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 8
Replace the HUD switch. Refer to Switch
Replacement - Ignition and Start, DIC
7 -
Display and HUD Dimmer.
Did you complete the replacement? Go to Step 9
Replace the HUD. Refer to Control Module
References in Computer/Integrating Systems
8 -
for replacement, setup, and programming.
Did you complete the replacement? Go to Step 9
1. Use the scan tool in order to clear the
DTCs.
2. Operate the vehicle within the Conditions
9 for Running the DTC as specified in the
supporting text.

Does the DTC reset? System OK Go to Step 2

DTC B3634

Circuit Description

The head-up display (HUD) monitors the HUD dimming up switch signal circuit in order to
perform the switch functions. When the HUD dimming up switch is depressed and the ignition is
in the RUN position, the dimming switch signal to the HUD is low. When the HUD detects that
the HUD dimming switch signal is low for greater than 60 seconds, DTC B3634 sets.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3634 Head Up Display (HUD) Dimming (Up) Switch Circuit

Conditions for Running the DTC

The ignition is RUN.

Conditions for Setting the DTC

The HUD detects that the HUD dimming up switch signal circuit is low for greater than 60
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seconds.
Action Taken When the DTC Sets

The HUD ignores the malfunctioning switch circuit.

Conditions for Clearing the DTC

The current DTC clears when fault is no longer present but all history codes remain.

The HUD receives a clear code command from the scan tool.

DTC B3634
Step Action Yes No
Schematic Reference: Head Up Display Schematics
Did you perform the Diagnostic System Check Go to Diagnostic
1 - Vehicle? System Check -
Go to Step 2 Vehicle
1. Turn On the ignition, with the engine ON.
2. Adjust the HUD dim up switch to Go to Testing
maximum intensity and then to minimum for Intermittent
2 intensity. Conditions and
Poor
Does the HUD dim up switch operate Connections in
correctly? Wiring Systems Go to Step 3
1. Turn OFF the ignition.
2. Disconnect the HUD.
3. With the dim up switch adjusted to the
least minimum intensity, connect a test
lamp between the HUD dimming up
3 switch signal circuit and battery positive
voltage. Refer to Circuit Testing in
Wiring Systems.
4. Turn ON the ignition, with the engine ON.

Does the test lamp illuminate? Go to Step 4 Go to Step 6

Test the HUD dimming up switch signal circuit
for a short to ground. Refer to Circuit Testing
4
and Wiring Repairs in Wiring Systems.

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Did you find and correct the condition? Go to Step 9 Go to Step 5

Inspect for poor connections at the HUD
switch. Refer to Testing for Intermittent
5 Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 7
Inspect for poor connections at the HUD
module. Refer to Testing for Intermittent
6 Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 8
Replace the HUD switch. Refer to Switch
Replacement - Ignition and Start, DIC
7 -
Display and HUD Dimmer.
Did you complete the replacement? Go to Step 9
Replace the HUD. Refer to Control Module
References in Computer/Integrating Systems
8 -
for replacement, setup, and programming.
Did you complete the replacement? Go to Step 9
1. Use the scan tool in order to clear the
DTCs.
2. Operate the vehicle within the Conditions
9 for Running the DTC as specified in the
supporting text.

Does the DTC reset? System OK Go to Step 2

DTC B3659

Circuit Description

The head-up display (HUD) monitors the HUD dimming down switch signal circuit in order to
perform the switch functions. When the HUD dimming down switch is depressed and the ignition
is in the RUN position, the dimming down switch signal to the HUD is low. When the HUD
detects that the HUD dimming down switch signal is low for greater than 60 seconds, DTC
B3659 sets.
DTC Descriptor

This diagnostic procedure supports the following DTC:

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DTC B3659 Head Up Display (HUD) Dimming Down Switch Circuit

Conditions for Running the DTC

The ignition is RUN.

Conditions for Setting the DTC

The HUD detects that the HUD dimming down switch signal circuit is low for greater than 60
seconds.
Action Taken When the DTC Sets

The HUD ignores the malfunctioning switch circuit.

Conditions for Clearing the DTC

The current DTC clears when fault is no longer present but all history codes remain.

The HUD receives a clear code command from the scan tool.

DTC B3659
Step Action Yes No
Schematic Reference: Head Up Display Schematics
Did you perform the Diagnostic System Check Go to Diagnostic
1 - Vehicle? System Check -
Go to Step 2 Vehicle
1. Turn On the ignition, with the engine ON.
2. Adjust the HUD dim down switch to Go to Testing
maximum intensity and then to minimum for Intermittent
2 intensity. Conditions and
Poor
Does the HUD dim down switch operate Connections in
correctly? Wiring Systems Go to Step 3
1. Turn OFF the ignition.
2. Disconnect the HUD.
3. With the dim down switch adjusted to the
3 least minimum intensity, connect a test
lamp between the HUD dimming down
switch signal circuit and battery positive
voltage. Refer to Circuit Testing in
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Wiring Systems.
4. Turn ON the ignition, with the engine ON.

Does the test lamp illuminate? Go to Step 4 Go to Step 6

Test the HUD dimming down switch signal
circuit for a short to ground. Refer to Circuit
4 Testing and Wiring Repairs in Wiring
Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 5
Inspect for poor connections at the HUD
switch. Refer to Testing for Intermittent
5 Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 7
Inspect for poor connections at the HUD
module. Refer to Testing for Intermittent
6 Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 8
Replace the HUD switch. Refer to Switch
Replacement - Ignition and Start, DIC
7 -
Display and HUD Dimmer.
Did you complete the replacement? Go to Step 9
Replace the HUD. Refer to Control Module
References in Computer/Integrating Systems
8 -
for replacement, setup, and programming.
Did you complete the replacement? Go to Step 9
1. Use the scan tool in order to clear the
DTCs.
2. Operate the vehicle within the Conditions
9 for Running the DTC as specified in the
supporting text.

Does the DTC reset? System OK Go to Step 2

DTC B3744

Circuit Description

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The head-up display (HUD) monitors the HUD mode switch signal circuit in order to perform the
switch functions. When the HUD mode switch is depressed and the ignition is in the RUN
position, the mode switch signal to the HUD is low. When the HUD detects that the HUD mode
switch signal is low for greater than 60 seconds, DTC B3744 sets.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3744 Head Up Display (HUD) Mode Switch Circuit

Conditions for Running the DTC

The ignition is RUN.

Conditions for Setting the DTC

The HUD detects that the HUD mode switch signal circuit is low for greater than 60 seconds.
Action Taken When the DTC Sets

The HUD ignores the malfunctioning switch circuit.

Conditions for Clearing the DTC

The current DTC clears when fault is no longer present but all history codes remain.

The HUD receives a clear code command from the scan tool.

DTC B3744
Step Action Yes No
Schematic Reference: Head Up Display Schematics
Did you perform the Diagnostic System Check Go to Diagnostic
1 - Vehicle? System Check -
Go to Step 2 Vehicle
1. Turn On the ignition, with the engine ON. Go to Testing
2. Press and release the HUD mode switch to for Intermittent
2 change the modes displayed in the HUD. Conditions and
Poor
Does the HUD mode switch operate correctly? Connections in
Wiring Systems Go to Step 3
1. Turn OFF the ignition.
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2. Disconnect the HUD.

3. With the mode switch released, connect a
test lamp between the HUD data switch
signal circuit and battery positive voltage.
3 Refer to Circuit Testing in Wiring
Systems.
4. Turn ON the ignition, with the engine ON.

Does the test lamp illuminate? Go to Step 4 Go to Step 6

Test the HUD data switch signal circuit for a
short to ground. Refer to Circuit Testing and
4
Wiring Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 5
Inspect for poor connections at the HUD
switch. Refer to Testing for Intermittent
5 Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 7
Inspect for poor connections at the HUD
module. Refer to Testing for Intermittent
6 Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 8
Replace the HUD switch. Refer to Switch
Replacement - Ignition and Start, DIC
7 -
Display and HUD Dimmer.
Did you complete the replacement? Go to Step 9
Replace the HUD. Refer to Control Module
References in Computer/Integrating Systems
8 -
for replacement, setup, and programming.
Did you complete the replacement? Go to Step 9
1. Use the scan tool in order to clear the
DTCs.
2. Operate the vehicle within the Conditions
9 for Running the DTC as specified in the
supporting text.

Does the DTC reset? System OK Go to Step 2

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DTC P0461

Circuit Description

The primary (left) fuel level sender and the secondary (right) fuel level sender change resistance
in response to fuel level. The engine control module (ECM) monitors the signal circuit of the
primary (left) fuel level sender and the secondary (right) fuel level sender in order to determine
the fuel level. When the fuel tanks are full, the resistances of both fuel level senders are high, and
the ECM senses a high signal voltage on both the signal circuit of the primary (left) fuel level
sender and the signal circuit of the secondary (right) fuel level sender. When the fuel tanks are
empty, the resistances of the fuel level senders are low, and the ECM senses a low signal voltage.
The ECM uses the signal circuits of the primary (left) fuel level sender and the secondary (right)
fuel level sender in order to calculate the percentage of remaining fuel in the tanks. The ECM
sends the fuel level percentage via the class 2 serial data circuit to the instrument cluster in order
to control the fuel gage. The fuel level information is also used for misfire and evaporative
emission (EVAP) diagnostics.

This diagnostic tests for a stuck primary (left) fuel level sensor signal. The ECM sets this DTC if
the primary (left) fuel level sensor signal appears to be stuck based on a lack of signal variation
expected during normal operation.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0461 Fuel Level Sensor Performance

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The ECM does not detect a change in fuel level in the primary (left) fuel tank of at least 3 L (0.79
gal) over a distance of 320 km (200 mi).
Action Taken When the DTC Sets

The fuel gage defaults to empty.

The driver information center (DIC) displays the FUEL LEVEL LOW message.

The ECM records the operating conditions at the time that the diagnostic test fails. The
ECM displays the failure information in the Failure Records on the scan tool.
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Conditions for Clearing the DTC

The DTC becomes history when the conditions for setting the DTC are no longer present.

The history DTC clears after 40 malfunction-free warm-up cycles.

The ECM receives the clear code command from the scan tool.
Diagnostic Aids

Use the Freeze Frame/Failure Records data in order to locate an intermittent condition. If
you cannot duplicate the DTC, the information included in the Freeze Frame/Failure
Records data may help in determining the number of miles since the DTC set. The Fail
Counter and Pass Counter can also help in determining the number of ignition cycles that the
diagnostic test reported a pass and/or fail. Operate the vehicle within the same Freeze
Frame conditions, including those for RPM, for engine load, for vehicle speed, for
temperature, and for others. This will isolate at what point the DTC failed.

Refer to Testing for Intermittent Conditions and Poor Connections .

Check if DTC P2066 is also set. Both these codes will set simultaneously if the vehicle was
refueled with the engine ON.

DTC P0461
Step Action Yes No
Schematic Reference: Instrument Cluster Schematics
Connector End View Reference: Instrument Panel, Gages, and Console Component
Views, Engine Control Module (ECM) Connector End Views for the 6.0L engine or
Engine Control Module (ECM) Connector End Views for the 7.0L engine
Did you perform the Diagnostic System Check - Go to Diagnostic
1 Vehicle? System Check -
Go to Step 2 Vehicle
1. Remove the primary (left) fuel level
sender.
2. Inspect for the following items:

The fuel level sensor is stuck, perhaps
2 due to an interference with the fuel
strainer.

The fuel tank contains foreign
material, for instance, ice.

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Did you find and correct the condition? Go to Step 4 Go to Step 3

Replace the primary (left) fuel level sensor.
Refer to Fuel Level Sensor Replacement -
Left for the 6.0L engine or to Fuel Level
3 -
Sensor Replacement - Left for the 7.0L
engine.
Did you complete the replacement? Go to Step 4
1. Use the scan tool in order to clear the
DTCs.
2. Operate the vehicle within the Conditions
4 for Running the DTC as specified in the
supporting text.

Does the DTC reset? Go to Step 2 System OK

DTC P0462

Circuit Description

The primary (left) fuel level sensor measures fuel level changes within the primary (left) fuel tank
and changes resistance based on fuel level. The engine control module (ECM) monitors changes
in the resistance of the sensor to determine the fuel level.

When the fuel tank is full, the sensor resistance is high, and the ECM senses a high signal voltage.
When the fuel tank is empty, the sensor resistance is low, and the ECM senses a low signal
voltage.

The ECM uses inputs from the fuel level sensor to calculate the total fuel remaining in the fuel
tanks. This information is then sent to the instrument panel cluster (IPC) via the class 2 serial data
circuit.

When the ECM senses a signal voltage lower than the normal operating range of the sensor, DTC
P0462 sets.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0462 Fuel Level Sensor 1 Circuit Low Voltage

Conditions for Running the DTC
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The ignition is ON.

Conditions for Setting the DTC

Fuel level sensor voltage for the primary (left) fuel level sensor is below 0.5 volts.

The fuel level signal is less than 3.5 percent.

The above conditions are present for greater than 6 seconds.
Action Taken When the DTC Sets

The driver information center (DIC) displays the LOW FUEL message.

The fuel gage defaults to empty.

The ECM records the operating conditions at the time the diagnostic fails. The ECM
displays the failure information in the Failure Records on the scan tool.
Conditions for Clearing the DTC

The DTC becomes history when the conditions for setting the DTC are no longer present.

The history DTC clears after 40 malfunction free warm-up cycles.

The ECM receives the clear code command from the scan tool.
Diagnostic Aids

IMPORTANT: When inspecting for a deformed or a warped fuel tank, measure

the resistance of the suspect fuel level sensor at empty, with the
sensor in the fuel tank, and again with the sensor removed from
the fuel tank. The measured resistance values should be the
same at empty. If the measured resistance values are not the
same, refer to Fuel Tank Replacement - Left .

Use the Freeze Frame and/or Failure Records data in order to locate an intermittent
condition. If you cannot duplicate the DTC, the information included in the Freeze Frame
and/or Failure Records data may aid in determining the number of miles since the DTC set.

The Fail Counter and Pass Counter can also aid in determining the number of ignition cycles
that the diagnostic reported a pass and/or fail. Operate the vehicle within the same freeze
frame conditions (RPM, engine load, vehicle speed, temperature, etc.). This will isolate
when the DTC failed.

Refer to Testing for Intermittent Conditions and Poor Connections .

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Test Description

The number below refers to the step number on the diagnostic table.

3: Tests for the proper operation of the circuit in the high voltage range.

DTC P0462
Step Action Values Yes No
Schematic Reference: Instrument Cluster Schematics
Connector End View Reference: Instrument Panel, Gages, and Console Component
Views, Engine Control Module (ECM) Connector End Views for the 6.0L engine or
Engine Control Module (ECM) Connector End Views for the 7.0L engine
Did you perform the Diagnostic System Go to
Check - Vehicle? Diagnostic
1 - System
Check -
Go to Step 2 Vehicle
1. Install a scan tool.
2. Turn ON the ignition, with the
engine OFF.
3. With a scan tool, observe the Fuel
Level Sensor Left Tank parameter in
2 the engine control module (ECM) 0.5 V
evaporative emission (EVAP) data
list.

Does the scan tool indicate that the Fuel Go to

Level Sensor Left Tank parameter is less Diagnostic
than the specified value? Go to Step 3 Aids
1. Turn OFF the ignition.
2. Disconnect C420.
3. Turn ON the ignition, with the
engine OFF.
3 4. With a scan tool, observe the Fuel 4.5 V
Level Sensor Left Tank parameter.

Does the scan tool indicate that the Fuel

Level Sensor Left Tank parameter is
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greater than the specified value? Go to Step 5 Go to Step 4

Test the signal circuit of the fuel level
sender for a short to ground. Refer to
4 -
Circuit Testing and Wiring Repairs . Go to Step
Did you find and correct the condition? 10 Go to Step 7
Test the signal circuit of the fuel level
sensor for a short to ground between C420
5 and the fuel level sensor. Refer to Circuit -
Testing and Wiring Repairs . Go to Step
Did you find and correct the condition? 10 Go to Step 6
Inspect for poor connections at the harness
connector of the fuel level sensor. Refer to
Testing for Intermittent Conditions
6 -
and Poor Connections and Connector
Repairs . Go to Step
Did you find and correct the condition? 10 Go to Step 8
Inspect for poor connections at the harness
connector of the ECM. Refer to Testing
7 for Intermittent Conditions and Poor -
Connections and Connector Repairs . Go to Step
Did you find and correct the condition? 10 Go to Step 9
Replace the primary (left) fuel level
sensor. Refer to Fuel Level Sensor
Replacement - Left for the 6.0L engine
8 -
or to Fuel Level Sensor Replacement -
Left for the 7.0L engine. Go to Step
Did you complete the replacement? 10 -
Replace the ECM. Refer to Control
Module References for replacement,
9 -
setup, and programming. Go to Step
Did you complete the replacement? 10 -
1. Use the scan tool in order to clear the
DTCs.
10 2. Operate the vehicle within the -
Conditions for Running the DTC.

Does the DTC reset? Go to Step 2 System OK

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DTC P0463

Circuit Description

The primary (left) fuel level sensor measures fuel level changes within the primary (left) fuel tank
and changes resistance based on fuel level. The engine control module (ECM) monitors changes
in the resistance of the sensor to determine fuel level.

When the fuel tank is full, the sensor resistance is high, and the ECM senses a high signal voltage.
When the fuel tank is empty, the sensor resistance is low, and the ECM senses a low signal
voltage.

The ECM uses inputs from the fuel level sensor to calculate the total fuel remaining in the fuel
tanks. This information is then sent to the instrument panel cluster (IPC) via the class 2 serial data
circuit.

When the ECM senses a signal voltage higher than the normal operating range of the sensor, DTC
P0463 sets.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0463 Fuel Level Sensor 1 Circuit High Voltage

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

Fuel level sensor voltage for the primary (left) fuel level sensor is above 4.5 volts.

The fuel level signal is greater than 98 percent.

The above conditions are present for greater than 6 seconds.
Action Taken When the DTC Sets

The driver information center (DIC) displays a LOW FUEL message.

The fuel gage defaults to empty.

The ECM records the operating conditions at the time the diagnostic fails. The ECM
displays the failure information in the Failure Records on the scan tool.

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Conditions for Clearing the DTC

The DTC becomes history when the conditions for setting the DTC are no longer present.

The history DTC clears after 40 malfunction free warm-up cycles.

The ECM receives the clear code command from the scan tool.
Diagnostic Aids

IMPORTANT: When inspecting for a deformed or warped fuel tank, measure the
resistance of the suspect fuel level sensor at empty, with the
sensor in the fuel tank, and again with the sensor removed from
the fuel tank. The measured resistance values should be the
same at empty. If the measured resistance values are not the
same, refer to Fuel Tank Replacement - Left .

Use the Freeze Frame and/or Failure Records data in order to locate an intermittent condition. If
you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure
Records data may aid in determining the number of miles since the DTC set. The Fail Counter
and Pass Counter can also aid in determining the number of ignition cycles that the diagnostic
reported a pass and/or fail. Operate the vehicle within the same freeze frame conditions (RPM,
load, vehicle speed, temperature, etc.). This will isolate when the DTC failed.

Refer to Testing for Intermittent Conditions and Poor Connections .

Test Description

The number below refers to the step number on the diagnostic table.

3: Tests for the proper operation of the circuit in the low voltage range.

DTC P0463
Step Action Values Yes No
Schematic Reference: Instrument Cluster Schematics
Connector End View Reference: Instrument Panel, Gages, and Console Component
Views, Engine Control Module (ECM) Connector End Views for the 6.0L engine or
Engine Control Module (ECM) Connector End Views for the 7.0L engine
Did you perform the Diagnostic System
Check - Vehicle? Go to
1 - Diagnostic
System
Check -
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Go to Step 2 Vehicle
1. Install a scan tool.
2. Turn ON the ignition, with the
engine OFF.
3. With a scan tool, observe the Fuel
Level Sensor Left Tank parameter in
2 the engine control module (ECM) 4.5 V
enhanced evaporative emission
(EVAP) data list.

Does the scan tool indicate that the Fuel Go to

Level Sensor Left Tank parameter is Diagnostic
greater than the specified value? Go to Step 3 Aids
1. Turn OFF the ignition.
2. Disconnect C420.
3. Connect a 3-amp fused jumper
between the signal circuit of the fuel
level sensor and the low reference
circuit of the fuel level sensor, female
terminal side.
3 4. Turn ON the ignition, with the 0.5 V
engine OFF.
5. With a scan tool, observe the Fuel
Level Sensor Left Tank parameter.

Does the scan tool indicate that the Fuel

Level Sensor Left Tank parameter is less
than the specified value? Go to Step 6 Go to Step 4
Test the signal circuit of the fuel level
sensor for the following:

An open
4
A high resistance -

A short to voltage

Refer to Circuit Testing and Wiring

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Repairs . Go to Step
Did you find and correct the condition? 12 Go to Step 5
Test the low reference circuit of the fuel
level sensor for the following:

An open

A high resistance
5
A short to voltage -

Refer to Circuit Testing and Wiring

Repairs . Go to Step
Did you find and correct the condition? 12 Go to Step 9
Test the signal circuit of the fuel level
sensor for the following between C420
and the left fuel level sensor.

An open

A high resistance
6 -

A short to voltage

Refer to Circuit Testing and Wiring

Repairs . Go to Step
Did you find and correct the condition? 12 Go to Step 7
Test the low reference circuit of the left
fuel level sensor for the following between
C420 and the left fuel level sensor.

An open

A high resistance
7 -

A short to voltage

Refer to Circuit Testing and to Wiring

Repairs . Go to Step
Did you find and correct the condition? 12 Go to Step 8
Inspect for poor connections at the harness
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connector of the left fuel level sensor.

Refer to Testing for Intermittent
8 Conditions and Poor Connections and -
Connector Repairs . Go to Step
Did you find and correct the condition? 12 Go to Step 10
Inspect for poor connections at the harness
connector of the ECM. Refer to Testing
9 for Intermittent Conditions and Poor -
Connections and Connector Repairs . Go to Step
Did you find and correct the condition? 12 Go to Step 11
Replace the primary (left) fuel level
sensor. Refer to Fuel Level Sensor
Replacement - Left for the 6.0L engine
10 -
or to Fuel Level Sensor Replacement -
Left for the 7.0L engine. Go to Step
Did you complete the replacement? 12 -
Replace the ECM. Refer to Control
Module References for replacement,
11 -
setup, and programming. Go to Step
Did you complete the replacement? 12 -
1. Use the scan tool in order to clear the
DTCs.
12 2. Operate the vehicle within the -
Conditions for Running the DTC.

Does the DTC reset? Go to Step 2 System OK

DTC P0464

Circuit Description

The fuel level sensor changes resistance based on the fuel level. The engine control module
(ECM) monitors the signal circuit of the fuel level sensor in order to determine fuel level. When
the fuel tank is full, the sensor resistance is high and the ECM senses a high signal voltage. When
the fuel tank is empty, the sensor resistance is low and the ECM senses a low signal voltage. The
ECM uses the signal circuit of the fuel level sensor in order to calculate the total remaining fuel
percent in the tank. The ECM sends the fuel level message via the class 2 serial data circuit to the
instrument panel cluster (IPC) for the fuel gage display. The fuel level information is also used for
misfire and evaporative emission (EVAP) diagnostics.
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This diagnostic tests for an intermittent fuel level sensor signal. If a change in fuel level is
detected, the engine-off natural vacuum small leak test DTC P0442 is aborted due to a refueling
event. Before aborting DTC P0442 a refueling event test is executed to confirm that a refueling
event has occurred. If refueling is confirmed, the test is considered a pass. Otherwise, the DTC
P0464 sets indicating an intermittent signal problem. Refer to Fuel Level Specifications in
order to verify the correct fuel level sensor readings.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0464 Fuel Level Sensor Circuit Intermittent

Conditions for Running the DTC

The ignition is OFF.

DTC P0442 is running.
Conditions for Setting the DTC

The fuel level change is greater than 10 percent during engine off test.

The above condition is present for greater than 30 seconds.
Action Taken When the DTC Sets

DTC P0442 is aborted.

The ECM records the operating conditions at the time the diagnostic fails. The ECM
displays the failure information in the Failure Records on the scan tool.
Conditions for Clearing the DTC

The DTC becomes history when the conditions for setting the DTC are no longer present.

The history DTC clears after 40 malfunction free warm-up cycles.

The ECM receives the clear code command from the scan tool.
Diagnostic Aids

Use the Freeze Frame and/or Failure Records data in order to locate an intermittent
condition. If you cannot duplicate the DTC, the information included in the Freeze Frame
and/or Failure Records data may aid in determining the number of miles since the DTC set.
The Fail Counter and Pass Counter can also aid in determining the number of ignition cycles
that the diagnostic reported a pass and/or fail. Operate the vehicle within the same freeze
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

frame conditions, i.e. RPM, engine load, vehicle speed, temperature, etc. This will isolate
when the DTC failed.

Refer to Testing for Intermittent Conditions and Poor Connections .

If the DTC sets without a refueling event, refer to Fuel Gage Inaccurate or Inoperative.

DTC P0521

Circuit Description

The engine oil pressure (EOP) sensor changes resistance based on engine oil pressure. The engine
control module (ECM) monitors the signal circuit of the EOP sensor. When the oil pressure is
high, the sensor resistance is high, and the ECM senses a high signal voltage. When the oil
pressure is low, the sensor resistance is low, and the ECM senses a low signal voltage. The ECM
sends the engine oil pressure information to the instrument panel cluster (IPC) via the class 2
serial data circuit.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0521 Engine Oil Pressure (EOP) Sensor Performance

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

The ECM does not detect a change in the engine oil pressure of at least 34.5 kPa (5 psi) over a
predetermined variance of the engine speed.
Action Taken When the DTC Sets

The ECM records the operating conditions at the time the diagnostic test fails. The ECM
displays this information in the Failure Records on the scan tool.

The IPC illuminates the engine oil pressure indicator.
Conditions for Clearing the DTC

The DTC becomes history when the conditions for setting the DTC are no longer present.

The history DTC clears after 40 malfunction free warm-up cycles.
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The ECM receives a clear code command from the scan tool.
Diagnostic Aids

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate
the DTC, the information in the Failure Records can help determine how many miles since the
DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that
the diagnostic test reported a pass and/or a fail.

Refer to Testing for Intermittent Conditions and Poor Connections .

DTC P0521
Step Action Values Yes No
Schematic Reference: Instrument Cluster Schematics
Connector End View Reference: Instrument Panel, Gages, and Console Component
Views, Engine Control Module (ECM) Connector End Views for the 6.0L engine or
Engine Control Module (ECM) Connector End Views for the 7.0L engine
Did you perform the Diagnostic System Go to
Check - Vehicle? Diagnostic
1 - System
Check -
Go to Step 2 Vehicle
1. Install a scan tool.
2. Turn ON the ignition, with the
engine ON.
3. With the scan tool, observe the
Engine Oil Pressure Sensor
parameter in the engine control
2 module (ECM) instrument panel 0.7-2.5 V
cluster (IPC) Data list.

Does the Engine Oil Pressure Sensor

parameter display values that vary within Go to
the specified values when idling and Diagnostic
accelerating the engine? Aids Go to Step 3
Replace the engine oil pressure (EOP)
sensor. Refer to Engine Oil Pressure
3 Sensor and/or Switch Replacement for -
the 6.0L engine or Engine Oil Pressure
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Sensor and/or Switch Replacement for

the 7.0L engine.
Did you complete the replacement? Go to Step 4 -
1. Use the scan tool in order to clear
the DTCs.
4 2. Operate the vehicle within the -
Conditions for Running the DTC.

Does the DTC reset? Go to Step 2 System OK

DTC P0522

Circuit Description

The engine oil pressure (EOP) sensor changes resistance based on engine oil pressure. The engine
control module (ECM) monitors the signal circuit of the EOP sensor. When the oil pressure is
high, the sensor resistance is high, and the ECM senses a high signal voltage. When the oil
pressure is low, the sensor resistance is low, and the ECM senses a low signal voltage. The ECM
sends the engine oil pressure information to the instrument panel cluster (IPC) via the class 2
serial data circuit.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0522 Engine Oil Pressure (EOP) Sensor Circuit Low Voltage
Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

The ECM detects that the EOP sensor signal circuit is less than 0.4 volts.

The above condition is present for greater than 10 seconds.
Action Taken When the DTC Sets

The ECM records the operating conditions at the time the diagnostic test fails. The ECM
displays this information in the Failure Records on the scan tool.

The IPC illuminates the engine oil pressure indicator.

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Conditions for Clearing the DTC

The DTC becomes history when the conditions for setting the DTC are no longer present.

The history DTC clears after 40 malfunction-free warm-up cycles.

The ECM receives a clear code command from the scan tool.
Diagnostic Aids

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate
the DTC, the information in the Failure Records can help determine how many miles since the
DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that
the diagnostic test reported a pass and/or a fail.

Refer to Testing for Intermittent Conditions and Poor Connections .

Test Description

The number below refers to the step number on the diagnostic table.

3: This step tests for the proper operation of the circuit in the high voltage range.

DTC P0522
Step Action Values Yes No
Schematic Reference: Instrument Cluster Schematics
Connector End View Reference: Instrument Panel, Gages, and Console Component
Views, Engine Control Module (ECM) Connector End Views for the 6.0L engine or
Engine Control Module (ECM) Connector End Views for the 7.0L engine
Did you perform the Diagnostic System Go to
Check - Vehicle? Diagnostic
1 - System
Check -
Go to Step 2 Vehicle
1. Install a scan tool.
2. Turn ON the ignition, with the
engine OFF.
2 3. With the scan tool, observe the 0.4 V
Engine Oil Pressure Sensor
parameter in the engine control
module (ECM) instrument panel
cluster (IPC) Data, data list.
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Does the Engine Oil Pressure Sensor

parameter display less than the specified Go to
value? Diagnostic
Go to Step 3 Aids
1. Turn OFF the ignition.
2. Disconnect the engine oil pressure
(EOP) sensor.
3. Connect a 3-amp fused jumper
between the EOP sensor signal
circuit and the 5-volt reference
3 circuit of the EOP sensor. 4.6 V
4. With the scan tool, observe the
Engine Oil Pressure Sensor
parameter.

Does the Engine Oil Pressure Sensor

parameter display greater than the
specified value? Go to Step 8 Go to Step 4
Install a mechanical gage and start the
4 engine. -
Does the gage show oil pressure? Go to Step 8 Go to Step 5
1. Disconnect the fused jumper.
2. Measure the voltage between the 5-
volt reference circuit of the EOP
5 sensor and the low reference circuit 4.6 V
of the EOP sensor.

Does the voltage measure greater than the

specified value? Go to Step 7 Go to Step 6
Test the 5-volt reference circuit of the
EOP sensor for an open or for a high
6 resistance. Refer to Circuit Testing and -
Wiring Repairs . Go to Step
Did you find and correct the condition? 12 Go to Step 9
Test the EOP sensor signal circuit for an
open, a short to ground, or high resistance.
7 Refer to Circuit Testing and Wiring -
Repairs .
Go to Step
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Did you find and correct the condition? 12 Go to Step 9

Inspect for poor connections at the harness
connector of the EOP sensor. Refer to
Testing for Intermittent Conditions
8 -
and Poor Connections and Connector
Repairs . Go to Step
Did you find and correct the condition? 12 Go to Step 10
Inspect for poor connections at the harness
connector of the ECM. Refer to Testing
9 for Intermittent Conditions and Poor -
Connections and Connector Repairs . Go to Step
Did you find and correct the condition? 12 Go to Step 11
Replace the EOP sensor. Refer to Engine
Oil Pressure Sensor and/or Switch
Replacement for the 6.0L engine or
10 - -
Engine Oil Pressure Sensor and/or
Switch Replacement for the 7.0L engine. Go to Step
Did you complete the replacement? 12
Replace the ECM. Refer to Control
Module References for replacement,
11 - -
setup, and programming. Go to Step
Did you complete the replacement? 12
1. Use the scan tool in order to clear the
DTCs.
12 2. Operate the vehicle within the -
Conditions for Running the DTC.

Does the DTC reset? Go to Step 2 System OK

DTC P0523

Circuit Description

The engine oil pressure (EOP) sensor changes resistance based on engine oil pressure. The engine
control module (ECM) monitors the signal circuit of the EOP sensor. When the oil pressure is
high, the sensor resistance is high, and the ECM senses a high signal voltage. When the oil
pressure is low, the sensor resistance is low, and the ECM senses a low signal voltage. The ECM
sends the engine oil pressure information to the instrument panel cluster (IPC) via the class 2
serial data circuit.
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DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0523 Engine Oil Pressure (EOP) Sensor Circuit High Voltage
Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

The ECM detects that the EOP sensor signal circuit is greater than 4.6 volts.

The above condition is present for greater than 9 seconds.
Action Taken When the DTC Sets

The ECM records the operating conditions at the time that the diagnostic test fails. The ECM
displays this information in the Failure Records on the scan tool.
Conditions for Clearing the DTC

The DTC becomes history when the conditions for setting the DTC are no longer present.

The history DTC is cleared after 40 malfunction-free warm-up cycles.

The ECM receives the clear code command from the scan tool.
Diagnostic Aids

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate
the DTC, the information in the Failure Records can help in determining how many miles since
the DTC set. The Fail Counter and the Pass Counter can help determine how many ignition cycles
that the diagnostic test reported a pass and/or a fail.

Refer to Testing for Intermittent Conditions and Poor Connections .

Test Description

The number below refers to the step number on the diagnostic table.

3: This step tests for the proper operation of the circuit in the low voltage range.

DTC P0523
Step Action Values Yes No
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Schematic Reference: Instrument Cluster Schematics

Connector End View Reference: Instrument Panel, Gages, and Console Component
Views, Engine Control Module (ECM) Connector End Views for the 6.0L engine or
Engine Control Module (ECM) Connector End Views for the 7.0L engine
Did you perform the Diagnostic System Go to
Check - Vehicle? Diagnostic
1 - System
Check -
Go to Step 2 Vehicle
1. Install a scan tool.
2. Turn ON the ignition, with the engine
OFF.
3. With the scan tool, observe the
Engine Oil Pressure Sensor parameter
2 in the engine control module (ECM) 4.6 V
instrument panel cluster (IPC) Data,
data list.

Does the Engine Oil Pressure Sensor Go to

parameter display greater than the specified Diagnostic
value? Go to Step 3 Aids
1. Turn OFF the ignition.
2. Disconnect the engine oil pressure
(EOP) sensor.
3. With the scan tool, observe the
3 Engine Oil Pressure Sensor 0.4 V
parameter.

Does the Engine Oil Pressure Sensor

parameter display less than the specified
value? Go to Step 4 Go to Step 5
1. Turn OFF the ignition.
2. Disconnect the negative battery cable.
Refer to Battery Negative Cable
Disconnect/Connect Procedure
(7.0L) or Battery Negative Cable
Disconnect/Connect Procedure
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(6.0L) .
3. Measure the resistance from the low
reference circuit of the EOP sensor to
4 a good ground. 5 ohms

Is the resistance less than the specified

value? Go to Step 7 Go to Step 6
Test the EOP sensor signal circuit for a
short to voltage. Refer to Circuit Testing
5 -
and to Wiring Repairs . Go to Step
Did you find and correct the condition? 11 Go to Step 8
1. Disconnect the ECM.
2. Test the low reference circuit of the
EOP sensor for an open or for a high
6 resistance. Refer to Circuit Testing -
and to Wiring Repairs .
Go to Step
Did you find and correct the condition? 11 Go to Step 8
Inspect for poor connections at the harness
connector of the EOP sensor. Refer to
Testing for Intermittent Conditions and
7 -
Poor Connections and to Connector
Repairs . Go to Step
Did you find and correct the condition? 11 Go to Step 9
Inspect for poor connections at the harness
connector of the ECM. Refer to Testing
8 for Intermittent Conditions and Poor -
Connections and to Connector Repairs . Go to Step Go to Step
Did you find and correct the condition? 11 10
Replace the EOP sensor. Refer to Engine
Oil Pressure Sensor and/or Switch
Replacement for the 6.0L engine or
9 -
Engine Oil Pressure Sensor and/or
Switch Replacement for the 7.0L engine. Go to Step
Did you complete the replacement? 11 -
Replace the ECM. Refer to Control
10 Module References for replacement, -
setup, and programming.
Go to Step
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Did you complete the replacement? 11 -

1. Use the scan tool in order to clear the
DTCs.
11 2. Operate the vehicle within the -
Conditions for Running the DTC.

Does the DTC reset? Go to Step 2 System OK

DTC P0608

Circuit Description

The engine control module (ECM) creates the vehicle speed output signal by pulsing the circuit to
ground. The ECM monitors the voltage on the vehicle speed output circuit. If the ECM
determines that the voltage is out of the normal operating range, a DTC sets.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0608 Vehicle Speed Output Circuit

Conditions for Running the DTC

The engine speed is more than 400 RPM.

The ignition voltage is between 6-18 volts.
Conditions for Setting the DTC

The ECM detects that the commanded state of the driver and the actual state of the signal
circuit do not match.

The above condition must be present for a minimum of 5 seconds.
Action Taken When the DTC Sets

The ECM records the operating conditions at the time the diagnostic fails. The ECM displays the
failure information in the Failure Records on the scan tool.
Conditions for Clearing the MIL/DTC

The history DTC clears after 40 malfunction free warm-up cycles.

The DTC becomes history when the conditions for setting the DTC are no longer present.
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The powertrain control module (PCM) receives the clear code command from the scan tool.

DTC P0608
Step Action Yes No
Schematic Reference: Instrument Cluster Schematics
Connector End View Reference: Instrument Panel, Gages, and Console Connector
End Views, Engine Control Module (ECM) Connector End Views for the 6.0L engine
or Engine Control Module (ECM) Connector End Views for the 7.0L engine
Did you perform the Diagnostic System Check Go to Diagnostic
1 - Vehicle? System Check -
Go to Step 2 Vehicle
1. Install a scan tool.
2. Raise the vehicles drive wheels. Refer to
Lifting and Jacking the Vehicle .
3. Start the engine.
4. Place the transmission into drive.
2
5. With the scan tool, observe the Vehicle
Speed parameter in the engine control Go to Testing
module (ECM) Engine Data 2 data list. for Intermittent
Conditions and
Does the Vehicle Speed parameter match the Poor
speedometer display? Connections Go to Step 3
1. Turn OFF the ignition.
2. Disconnect the ECM connector C1.
3. Install one lead of the J 33431-C Signal
Generator and Instrument Panel Tester to
the vehicle speed signal circuit at the
ECM harness connector, and the other
3 lead to a good ground. See Special Tools.
4. Turn ON the ignition, with the engine
OFF.
5. Set the J 33431-C to generate a
speedometer signal. See Special Tools.

Does the vehicle speedometer indicate

approximately 55 MPH? Go to Step 5 Go to Step 4

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Test the vehicle speed signal circuit for the

following:

An open

A short to voltage
4
A short to ground

Refer to Circuit Testing and to Wiring

Repairs .
Did you find and correct the condition? Go to Step 9 Go to Step 6
Inspect for poor connections at harness
connector of the ECM. Refer to Testing for
5 Intermittent Conditions and Poor
Connections and to Connector Repairs .
Did you find and correct the condition? Go to Step 9 Go to Step 7
Inspect for poor connections at the harness
connector of the instrument panel cluster (IPC).
Refer to Testing for Intermittent Conditions
6
and Poor Connections and to Connector
Repairs .
Did you find and correct the condition? Go to Step 9 Go to Step 8
Replace the ECM. Refer to Control Module
References for replacement, setup, and
7
programming.
Did you complete the replacement? Go to Step 9 -
Replace the IPC. Refer to Control Module
References for replacement, setup, and
8
programming.
Did you complete the replacement? Go to Step 9 -
1. Use the scan tool in order to clear the
DTCs.
9 2. Operate vehicle within the Conditions for
Running this DTC.

Does the DTC reset? Go to Step 2 System OK

DTC P0654

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Circuit Description

The engine control module (ECM) creates the engine speed signal by pulsing the circuit to
ground. The ECM monitors the voltage on the engine speed signal circuit. If the ECM determines
that the voltage is not within the normal operating range, the ECM sets a DTC.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0654 Engine Speed Output Circuit

Conditions for Running the DTC

The engine speed is greater than 400 RPM.

The ignition voltage is greater than 6 volts, but less than 18 volts.
Conditions for Setting the DTC

The ECM detects that the commanded state of the driver and the actual state of the signal
circuit do not match.

The above condition exists for a minimum of 5 seconds.
Action Taken When the DTC Sets

The ECM stores the DTC information in memory when the diagnostic test runs and fails.

The malfunction indicator lamp (MIL) will not illuminate.

The ECM records the operating conditions at the time when the diagnostic test fails. The
ECM stores this information in the Failure Records.
Conditions for Clearing the MIL/DTC

The DTC becomes history when the conditions for setting the DTC are no longer present.

A history DTC is cleared after 40 consecutive malfunction free warm-up cycles.

The ECM receives the clear code command from the scan tool.

DTC P0654
Step Action Yes No
Schematic Reference: Instrument Cluster Schematics
Connector End View Reference: Instrument Panel, Gages, and Console Connector
End Views, Engine Controls Connector End Views for the 6.0L engine, or Engine
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Control Module (ECM) Connector End Views for the 7.0L engine
Did you perform the Diagnostic System Check Go to Diagnostic
1 - Vehicle? System Check -
Go to Step 2 Vehicle
1. Install a scan tool.
2. Start the engine.
3. With the scan tool, observe the Engine
Speed parameter in the engine control
2 module (ECM) instrument panel cluster Go to Testing
(IPC) data list. for Intermittent
Conditions and
Does the Engine Speed parameter match the Poor
tachometer display? Connections Go to Step 3
1. Turn the ignition OFF.
2. Disconnect the following ECM connector
C1.
3. Install one J 33431-C Signal Generator
and Instrument Panel Tester lead to the
engine speed signal circuit at the ECM
harness connector, and connect the other
3 lead to a good ground. See Special Tools.
4. Turn the ignition ON, with the engine
OFF.
5. Set the J 33431-C to generate a
tachometer signal. See Special Tools.

Does the vehicle tachometer indicate an RPM

reading? Go to Step 5 Go to Step 4
Test the engine speed signal circuit for a short
to voltage or for a short to ground. Refer to
4
Circuit Testing and to Wiring Repairs .
Did you find and correct the condition? Go to Step 9 Go to Step 6
Inspect for poor connections at the ECM
connector. Refer to Testing for Intermittent
5 Conditions and Poor Connections and to
Connector Repairs .
Did you find and correct the condition? Go to Step 9 Go to Step 7
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Inspect for a poor connection at the harness

connector of the instrument panel cluster (IPC).
Refer to Testing for Intermittent Conditions
6
and Poor Connections and to Connector
Repairs .
Did you find and correct the condition? Go to Step 9 Go to Step 8
Replace the ECM. Refer to Control Module
References for replacement, setup, and
7
programming.
Did you complete the replacement? Go to Step 9 -
Replace the IPC. Refer to Control Module
References for replacement, setup, and
8
programming.
Did you complete the replacement? Go to Step 9 -
1. Use the scan tool in order to clear the
DTCs.
9 2. Operate vehicle within the Conditions for
Running this DTC.

Does the DTC reset? Go to Step 2 System OK

DTC P1617

Circuit Description

The engine oil level switch grounds when the oil level is at the proper level. With the ignition
ON, and the engine OFF, the engine control module (ECM) should detect full oil level or a low
voltage on the signal circuit of the engine oil level switch. When the engine speed is at least 2,000
RPM, the ECM should detect a transition from a low voltage to a high voltage on the signal
circuit of the engine oil level switch.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P1617 Engine Oil Level Switch Circuit

Conditions for Running the DTC

The vehicle is travelling at a speed greater than 5 km/h (3 mph).

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The throttle position is greater than 5 percent.

The engine speed is at least 2,000 RPM.

The vehicle is cruising and is not accelerating.

The following DTCs are not set:
 P0122

 P0123

 P0506

 P0507

Conditions for Setting the DTC

The ECM does not detect a transition from a low voltage to a high voltage, when the engine
speed is at least 2,000 RPM.

The above condition is present for at least 5 minutes.

The condition may be present for up to 25 minutes before setting the DTC.
Action Taken When the DTC Sets

The ECM records the operating conditions at the time when the diagnostic test fails. The ECM
displays this information in the Failure Records on the scan tool.
Conditions for Clearing the DTC

The DTC becomes history when the conditions for setting the DTC are no longer present.

The history DTC is cleared after 40 malfunction free warm-up cycles.

The ECM receives the clear code command from the scan tool.
Diagnostic Aids

The Failure Records may help find an intermittent condition. If you cannot duplicate the DTC,
the information in the Failure Records can help determine how many miles since the DTC set.
The Fail Counter and the Pass Counter can also aid determining how many ignition cycles that the
diagnostic test reported a pass and/or a fail.

Refer to Testing for Intermittent Conditions and Poor Connections .

DTC P1617
Step Action Yes No
Schematic Reference: Instrument Cluster Schematics
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Connector End View Reference: Instrument Panel, Gages, and Console Connector
End Views, Engine Control Module (ECM) Connector End Views for the 6.0L engine
or Engine Control Module (ECM) Connector End Views for the 7.0L engine
Did you perform the Diagnostic System Check - Go to Diagnostic
1 Vehicle? System Check -
Go to Step 2 Vehicle
1. Install a scan tool.
2. Turn ON the ignition, with the engine
OFF.
3. With the scan tool, observe the Engine Oil
2 Level Switch parameter in the engine
control module (ECM) Engine Data 2
data list.

Does the Engine Oil Level Switch parameter Go to Diagnostic

display Low? Aids Go to Step 3
1. Turn OFF the ignition.
2. Disconnect the engine oil level switch.
3. Turn ON the ignition, with the engine
OFF.
3 4. With the scan tool, observe the Engine Oil
Level Switch parameter in the ECM
Engine Data 2 data list.

Does the Engine Oil Level Switch parameter

display Low? Go to Step 6 Go to Step 4
Test the signal circuit of the engine oil level
switch for a short to ground. Refer to Circuit
4
Testing and to Wiring Repairs .
Did you find and correct the condition? Go to Step 9 Go to Step 5
Inspect for poor connections at the harness
connector of the ECM. Refer to Testing for
5 Intermittent Conditions and Poor
Connections and to Connector Repairs .
Did you find and correct the condition? Go to Step 9 Go to Step 8
Inspect for poor connections at the harness
connector of the engine oil level switch. Refer
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to Testing for Intermittent Conditions and

Poor Connections and to Connector
6
Repairs .
Did you find and correct the condition? Go to Step 9 Go to Step 7
Replace the engine oil level switch. Refer to
Engine Oil Level Sensor and/or Switch
Replacement for the 6.0L engine or Engine
7
Oil Level Sensor and/or Switch
Replacement for the 7.0L engine.
Did you complete the replacement? Go to Step 9 -
Replace the ECM. Refer to Control Module
References for replacement, setup, and
8
programming.
Did you complete the replacement? Go to Step 9 -
1. Use the scan tool in order to clear the
DTCs.
9 2. Operate the vehicle within the Conditions
for Running the DTC.

Does the DTC reset? Go to Step 2 System OK

DTC P2066

Circuit Description

The primary (left) fuel level sender and the secondary (right) fuel level sender change resistance
in response to fuel level. The engine control module (ECM) monitors the signal circuit of the
primary (left) fuel level sender and the signal circuit of the secondary (right) fuel level sender in
order to determine the fuel level. When the fuel tanks are full, the resistances of both fuel level
senders are high, and the ECM senses a high signal voltage on both the signal circuit of the
primary (left) fuel level sender and the signal circuit of the secondary (right) fuel level sender.
When the fuel tanks are empty, the resistances of the fuel level senders are low, and the ECM
senses a low signal voltage. The ECM uses the signal circuits of the primary (left) fuel level
sender and the secondary (right) fuel level sender in order to calculate the percentage of
remaining fuel in the tanks. The ECM sends the fuel level percentage via the class 2 serial data
circuit to the instrument cluster in order to control the fuel gage. The fuel level information is also
used for misfire and evaporative emission (EVAP) diagnostics.

This diagnostic tests for a stuck secondary (right) fuel level sensor signal. The ECM sets this DTC
if the secondary (right) fuel level sensor signal appears to be stuck based on a lack of signal
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variation expected during normal operation.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P2066 Fuel Level Sensor 2 Performance

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The ECM does not detect a change in the secondary (left) fuel level of at least 3 L (0.79 gal) over
a distance of 320 km (200 mi).
Action Taken When the DTC Sets

The fuel gage defaults to empty.

The driver information center (DIC) illuminates the FUEL LEVEL LOW message.

The ECM records the operating conditions at the time that the diagnostic test fails. The
ECM displays the failure information in the Failure Records on the scan tool.
Conditions for Clearing the DTC

The DTC becomes history when the conditions for setting the DTC are no longer present.

The history DTC clears after 40 malfunction free warm-up cycles.

The ECM receives the clear code command from the scan tool.
Diagnostic Aids

Use the Freeze Frame/Failure Records data in order to locate an intermittent condition. If you
cannot duplicate the DTC, the information included in the Freeze Frame/Failure Records data
may help in determining the number of miles since the DTC set. The Fail Counter and Pass
Counter can also help in determining the number of ignition cycles that the diagnostic test
reported a pass and/or fail. Operate the vehicle within the same freeze frame conditions,
including those for RPM, for engine load, for vehicle speed, for temperature, and for others. This
will isolate at what point the DTC failed.

Refer to Testing for Intermittent Conditions and Poor Connections .

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DTC P2066
Step Action Yes No
Schematic Reference: Instrument Cluster Schematics
Connector End View Reference: Instrument Panel, Gages, and Console Connector
End Views, Engine Control Module (ECM) Connector End Views for the 6.0L engine
or Engine Control Module (ECM) Connector End Views for the 7.0L engine
Did you perform the Diagnostic System Check - Go to Diagnostic
1 Vehicle? System Check -
Go to Step 2 Vehicle
1. Remove the fuel level sender.
2. Inspect for the following items:

The fuel level sensor is stuck, perhaps
due to an interference with the fuel
2 strainer.

The fuel tank contains foreign
material, for instance, ice.

Did you find and correct the condition? Go to Step 4 Go to Step 3

Replace the secondary (right) fuel tank module.
Refer to Fuel Tank Module Replacement -
3 Right for the 6.0L engine or Filler Tube
Replacement for the 7.0L engine.
Did you complete the replacement? Go to Step 4 -
1. Use the scan tool in order to clear the
DTCs.
2. Operate the vehicle within the Conditions
4 for Running the DTC as specified in the
supporting text.

Does the DTC reset? Go to Step 2 System OK

DTC P2067

Circuit Description

The primary (left) fuel level sender and the secondary (right) fuel level sender change resistance
in response to the fuel level. The engine control module (ECM) monitors the signal circuit of the
primary (left) fuel level sender and the signal circuit of the secondary (right) fuel level sender in
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order to determine the fuel level. When the fuel tanks are full, the resistances of both fuel level
senders are high, and the ECM senses a high signal voltage on both the signal circuit of the
primary (left) fuel level sender and the signal circuit of the secondary (right) fuel level sender.
When the fuel tanks are empty, the resistances of the fuel level senders are low, and the ECM
senses a low signal voltage. The ECM uses the signal circuits of the primary (left) fuel level
sender and the secondary (right) fuel level sender in order to calculate the percentage of
remaining fuel in the tanks. The ECM sends the fuel level percentage via the class 2 serial data
circuit to the instrument cluster in order to control the fuel gage. The fuel level information is also
used for misfire and evaporative emission (EVAP) diagnostics. This diagnostic tests for a lower
than normal secondary fuel level sender signal.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P2067 Fuel Level Sensor 2 Circuit Low Voltage

Conditions for Running the DTC

The ignition is ON, with the engine ON.

Conditions for Setting the DTC

The secondary (right) fuel level signal is less than 0.5 volts.

The above condition is present for greater than 6 seconds.
Action Taken When the DTC Sets

The fuel gage reads inaccurately.

The driver information center (DIC) illuminates the FUEL LEVEL LOW message.

The ECM records the operating conditions at the time that the diagnostic test fails. The
ECM displays the failure information in the Failure Records on the scan tool.
Conditions for Clearing the DTC

The DTC becomes history when the conditions for setting the DTC are no longer present.

The history DTC clears after 40 malfunction free warm-up cycles.

The ECM receives the clear code command from the scan tool.
Diagnostic Aids

Use the Freeze Frame/Failure Records data in order to locate an intermittent condition. If you
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cannot duplicate the DTC, the information included in the Freeze Frame/Failure Records data
may help in determining the number of miles since the DTC set. The Fail Counter and Pass
Counter can also help in determining the number of ignition cycles that the diagnostic test
reported a pass and/or fail. Operate the vehicle within the same freeze frame conditions,
including those for RPM, for engine load, for vehicle speed, for temperature, and for others. This
will isolate at what point the DTC failed.

Refer to Testing for Intermittent Conditions and Poor Connections .

Test Description

The number below refers to the step numbers on the diagnostic table.

3: Tests for the proper operation of the circuit in the high voltage range.

DTC P2067
Step Action Value(s) Yes No
Schematic Reference: Instrument Cluster Schematics
Connector End View Reference: Instrument Panel, Gages, and Console Connector
End Views, Engine Control Module (ECM) Connector End Views for the 6.0 L engine
or Engine Control Module (ECM) Connector End Views for the 7.0 L engine or Inline
Harness Connector End Views
Did you perform the Diagnostic System Go to
Check - Vehicle? Diagnostic
1 - System
Check -
Go to Step 2 Vehicle
1. Install a scan tool.
2. Turn ON the ignition, with the
engine OFF.
3. With a scan tool, observe the Fuel
Level Sensor Right parameter in the
2 engine control module (ECM) 0.5 V
evaporative emission (EVAP) data
list.

Does the scan tool indicate that the Fuel Go to

Level Sensor Right parameter is less than Diagnostic
the specified value? Go to Step 3 Aids

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1. Turn OFF the ignition.

2. Disconnect C420.
3. Turn ON the ignition, with the
engine OFF.
3 4. With a scan tool, observe the Fuel 4.5 V
Level Sensor Right parameter.

Does the scan tool indicate that the Fuel

Level Sensor Right parameter is greater
than the specified value? Go to Step 5 Go to Step 4
Test the signal circuit of the secondary
(right) fuel level sensor for a short to
4 ground. Refer to Circuit Testing and to -
Wiring Repairs . Go to Step
Did you find and correct the condition? 10 Go to Step 7
Test the signal circuit of the secondary fuel
level sensor for a short to ground between
C101 and the secondary fuel level sensor.
5 -
Refer to Circuit Testing and to Wiring
Repairs . Go to Step
Did you find and correct the condition? 10 Go to Step 6
Inspect for poor connections at the harness
connector of the secondary fuel level
sensor. Refer to Testing for Intermittent
6 -
Conditions and Poor Connections and
to Connector Repairs . Go to Step
Did you find and correct the condition? 10 Go to Step 8
Inspect for poor connections at the harness
connector of the ECM. Refer to Testing
7 for Intermittent Conditions and Poor -
Connections and to Connector Repairs . Go to Step
Did you find and correct the condition? 10 Go to Step 9
Replace the secondary (right) fuel tank
module. Refer to Fuel Tank Module
Replacement - Right for the 6.0L engine
8 -
or Filler Tube Replacement for the 7.0L
engine. Go to Step
Did you complete the replacement? 10 -
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Replace the ECM. Refer to Control

Module References for replacement,
9 -
setup, and programming. Go to Step
Did you complete the replacement? 10 -
1. Use the scan tool in order to clear the
DTCs.
2. Operate the vehicle within the
10 Conditions for Running the DTC as -
specified in the supporting text.

Does the DTC reset? Go to Step 2 System OK

DTC P2068

Circuit Description

The primary (left) fuel level sender and the secondary (right) fuel level sender change resistance
in response to fuel level. The engine control module (ECM) monitors the signal circuit of the
primary (left) fuel level sender and the signal circuit of the secondary (right) fuel level sender in
order to determine the fuel level. When the fuel tanks are full, the resistances of both fuel level
senders are high, and the ECM senses a high signal voltage on both the signal circuit of the
primary (left) fuel level sender and the signal circuit of the secondary (right) fuel level sender.
When the fuel tanks are empty, the resistances of the fuel level senders are low, and the ECM
senses a low signal voltage. The ECM uses the signal circuits of the primary (left) fuel level
sender and the secondary (right) fuel level sender in order to calculate the percentage of
remaining fuel in the tanks. The ECM sends the fuel level percentage via the class 2 serial data
circuit to the instrument cluster in order to control the fuel gage. The fuel level information is also
used for misfire and evaporative emission (EVAP) diagnostics. This diagnostic tests for a higher
than normal secondary (right) fuel level sender signal.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P2068 Fuel Level Sensor 2 Circuit High Voltage

Conditions for Running the DTC

The ignition is ON, with the engine ON.

Conditions for Setting the DTC

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The secondary (right) fuel level signal is greater than 4.5 volts.

The above condition is present for greater than 6 seconds.
Action Taken When the DTC Sets

The fuel gage reads inaccurately.

The driver information center (DIC) illuminates the FUEL LEVEL LOW message.

The ECM records the operating conditions at the time that the diagnostic test fails. The
ECM displays the failure information in the Failure Records on the scan tool.
Conditions for Clearing the DTC

The DTC becomes history when the conditions for setting the DTC are no longer present.

The history DTC clears after 40 malfunction-free warm-up cycles.

The ECM receives the clear code command from the scan tool.
Diagnostic Aids

Use the Freeze Frame/Failure Records data in order to locate an intermittent condition. If you
cannot duplicate the DTC, the information included in the Freeze Frame/Failure Records data
may help in determining the number of miles since the DTC set. The Fail Counter and Pass
Counter can also help in determining the number of ignition cycles that the diagnostic test
reported a pass and/or fail. Operate the vehicle within the same Freeze Frame conditions,
including those for RPM, for engine load, for vehicle speed, for temperature, and for others. This
will isolate at what point the DTC failed.

Refer to Testing for Intermittent Conditions and Poor Connections .

Test Description

The number below refers to the step number on the diagnostic table.

3: This step tests for the proper operation of the circuit in the low voltage range.

DTC P2068
Step Action Value(s) Yes No
Schematic Reference: Instrument Cluster Schematics
Connector End View Reference: Instrument Panel, Gages, and Console Connector
End Views, Engine Control Module (ECM) Connector End Views for the 6.0L engine
or Engine Control Module (ECM) Connector End Views for the 7.0L engine or Inline
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Harness Connector End Views

Did you perform the Diagnostic System Go to
Check - Vehicle? Diagnostic
1 - System
Check -
Go to Step 2 Vehicle
1. Install a scan tool.
2. Turn ON the ignition, with the
engine OFF.
3. With a scan tool, observe the Fuel
Level Sensor Right parameter in the
2 engine control module (ECM) 4.5 V
evaporative emission (EVAP) data
list.

Does the scan tool indicate that the Fuel Go to

Level Sensor Right parameter is greater Diagnostic
than the specified value? Go to Step 3 Aids
1. Turn OFF the ignition.
2. Disconnect C420.
3. Connect a 3-amp fused jumper wire
between the signal circuit of the
secondary (right) fuel level sensor
and the low reference circuit of the
secondary (right) fuel level sensor on
the male terminal side of the
3 connector. 0.5 V
4. Turn ON the ignition, with the
engine OFF.
5. With a scan tool, observe the Fuel
Level Sensor Right parameter.

Does the scan tool indicate that the Fuel

Level Sensor Right parameter is less than
the specified value? Go to Step 6 Go to Step 4
Test the signal circuit of the secondary
(right) fuel level sensor for an open, high

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resistance, or a short to voltage. Refer to

4 Circuit Testing and Wiring Repairs . - Go to Step
Did you find and correct the condition? 12 Go to Step 5
Test the low reference circuit of the
secondary (right) fuel level sensor for an
5 open or high resistance. Refer to Circuit -
Testing and Wiring Repairs . Go to Step
Did you find and correct the condition? 12 Go to Step 9
Test the signal circuit of the secondary
(right) fuel level sensor for an open, high
resistance, or a short to voltage between
6 C101 and the secondary (right) fuel level -
sensor. Refer to Circuit Testing and
Wiring Repairs . Go to Step
Did you find and correct the condition? 12 Go to Step 7
Test the low reference circuit of the
secondary fuel level sensor for an open or
high resistance between C101 and the
7 -
secondary fuel level sensor. Refer to
Circuit Testing and Wiring Repairs . Go to Step
Did you find and correct the condition? 12 Go to Step 8
Inspect for poor connections at the harness
connector of the secondary (right) fuel
level sensor. Refer to Testing for
8 -
Intermittent Conditions and Poor
Connections and Connector Repairs . Go to Step
Did you find and correct the condition? 12 Go to Step 10
Inspect for poor connections at the harness
connector of the ECM. Refer to Testing
9 for Intermittent Conditions and Poor -
Connections and Connector Repairs . Go to Step
Did you find and correct the condition? 12 Go to Step 11
Replace the secondary (right) fuel tank
module. Refer to Fuel Tank Module
Replacement - Right for the 6.0L engine
10 - -
or Filler Tube Replacement for the 7.0L
engine. Go to Step
Did you complete the replacement? 12

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Replace the ECM. Refer to Control

Module References for replacement,
11 - -
setup, and programming. Go to Step
Did you complete the replacement? 12
1. Use the scan tool in order to clear the
DTCs.
2. Operate the vehicle within the
12 Conditions for Running the DTC as -
specified in the supporting text.

Does the DTC reset? Go to Step 2 System OK

SYMPTOMS - INSTRUMENT PANEL, GAGES AND CONSOLE

IMPORTANT: The following steps must be completed before using the symptom
diagnostic tables.

1. Before using the symptom diagnostic tables, perform the following tests in order to
determine that there are no DTCs set, and that the control modules can communicate via the
serial data link:

Diagnostic Starting Point - Vehicle

Diagnostic System Check - Vehicle

2. Review the system operation in order to understand the system functions. Refer to the
following description and operations:

Instrument Panel Cluster (IPC) Description and Operation

Indicator/Warning Message Description and Operation

Driver Information Center (DIC) Description and Operation

Head Up Display (HUD) Description and Operation

Audible Warnings Description and Operation

Visual/Physical Inspection

Inspect for aftermarket devices which can affect the operation of the instrument panel
cluster (IPC) or the audible warnings system. Refer to Checking Aftermarket
Accessories .

Inspect the accessible system components or the visible system components for obvious
damage or for obvious conditions which can cause the symptom.
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Inspect for the proper fluid levels.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to
Testing for Intermittent Conditions and Poor Connections .
Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the
symptom:

Gages

Engine Oil Pressure Gage Inaccurate or Inoperative

Fuel Gage Inaccurate or Inoperative

Speedometer and/or Odometer Inaccurate or Inoperative

Tachometer Inaccurate or Inoperative

Indicators

ABS Indicator Always On

ABS Indicator Inoperative

Air Bag Indicator Circuit Malfunction

Brake Warning Indicator Always On

Brake Warning Indicator Inoperative

Engine Oil Pressure Gage Inaccurate or Inoperative

Engine Oil Temperature Indicator Always On

Fog Lamp Indicator Always On

Fog Lamp Indicator Inoperative

High Beam Indicator Always On

High Beam Indicator Inoperative (Standard)

Low Engine Oil Level Indicator Always On

Low Engine Oil Level Indicator Inoperative

Malfunction Indicator Lamp (MIL) Inoperative for the 6.0L engine

Malfunction Indicator Lamp (MIL) Always On for the 6.0L engine

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Malfunction Indicator Lamp (MIL) Inoperative for the 7.0L engine

Malfunction Indicator Lamp (MIL) Always On for the 7.0L engine

Seat Belt Indicator Circuit Malfunction

Security Indicator Inoperative

Traction Control Indicator Always On

Traction Control Indicator Inoperative

Traction Off Indicator Always On

Traction Off Indicator Inoperative

Turn Signal Lamps and/or Indicators Always On or Flashing

Turn Signal Lamps and/or Indicators Inoperative
Driver Information Center

Driver Information Center (DIC) Switch(es) Inoperative

HUD

Head Up Display (HUD) Always On

Head Up Display (HUD) Inoperative

Head Up Display (HUD) Image Adjustment Inoperative

Head Up Display (HUD) Intensity Does Not Vary

Audible Warnings

Chime Always On

Chime Inoperative

ENGINE OIL PRESSURE GAGE INACCURATE OR INOPERATIVE

Engine Oil Pressure Gage Inaccurate or Inoperative

Step Action Yes No
Schematic Reference: Instrument Cluster Schematics
Did you perform the Diagnostic System Check Go to Diagnostic
- Vehicle? System Check -
1 Vehicle in
Vehicle DTC
Go to Step 2 Information
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1. Install a scan tool.

2. Start the engine.
3. With the scan tool, perform the instrument Go to Testing
2 panel cluster (IPC) Gages Oil Pressure for Intermittent
Gage Sweep Test. Conditions and
Poor
Does the engine oil pressure gage move up and Connections in
down when commanded? Wiring Systems Go to Step 3
Replace the IPC. Refer to Control Module
References in Computer/Integrating Systems
3
for replacement, setup, and programming.
Did you complete the replacement? Go to Step 4 -
Operate the system in order to verify the repair.
4
Did you correct the condition? System OK Go to Step 2

FUEL GAGE INACCURATE OR INOPERATIVE

Diagnostic Aids

Ensure that the fuel level is in the same range as the customer concern.

For intermittent diagnosis, refer to Testing for Intermittent Conditions and Poor
Connections .

Refer to Fuel Level Specifications in order to verify the correct fuel level sensor readings.
The Fuel Tank Level Remaining (%) parameter is available on the scan tool in the engine
control module (ECM) enhanced evaporative emission (EVAP) data list.

IMPORTANT: When inspecting for a deformed or warped fuel tank, measure the
resistance of the suspect fuel level sensor at empty, with the
sensor in the fuel tank, and again with the sensor removed from
the fuel tank. The measured resistance values should be the
same at empty. If the measured resistance values are not the
same, refer to Fuel Tank Replacement - Left or Fuel Tank
Replacement - Right for the 6.0L engine.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

3: This step tests for a high resistance in the signal circuit and the low reference circuit of
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the fuel level sensor.

13: DTCs will be set in the ECM when you perform this diagnostic table.

Fuel Gage Inaccurate or Inoperative

Step Action Value(s) Yes No
Schematic Reference: Instrument Cluster Schematics
Connector End View Reference: Instrument Panel, Gages, and Console Connector
End Views, Engine Control Module (ECM) Connector End Views for the 6.0L engine,
or Engine Control Module (ECM) Connector End Views for the 7.0L engine
Did you perform the Diagnostic System Go to
Check - Vehicle? Diagnostic
1 - System
Check -
Go to Step 2 Vehicle
1. Turn ON the ignition, with the
engine OFF.
2. Install a scan tool.
3. With the scan tool, perform the
Displays Test in the instrument panel
2 cluster (IPC) Special Functions -
Output Controls list.

Does the gage move from 0 to its

maximum value and back to 0 when you Go to Step
perform the Displays Test? Go to Step 3 16
1. Disconnect C420, the fuel level
sensor.
2. Connect the J 33431-C signal
generator and instrument panel tester
between the signal circuit of the Fuel
Level Sensor Signal Primary (left)
and the low reference circuit of the
fuel level sensors on the male
terminal side. See Special Tools.
3. Turn ON the ignition, with the
engine OFF.

IMPORTANT:
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Verify the J 33431-C resistance settings

with a DMM. See Special Tools.

4. Vary the resistance on the J 33431-C

from 40-250 ohms. See Special
Tools.
5. With the scan tool, observe the Fuel
Level Sensor Right Voltage
parameter in engine control module
3 0.7-2.5 V
(ECM) evaporative emission
(EVAP) Data list.
6. Refer to Fuel Level Specifications
in order to convert from resistance to
Fuel Level Sensor Right voltage.

Does the Fuel Level Sensor Right voltage

parameter change smoothly across the Go to Step
specified range? Go to Step 4 10
1. Connect the J 33431-C signal
generator and instrument panel tester
between the signal circuit of the fuel
level sensor signal secondary (right)
and the low reference circuit of the
fuel level sensors on the male
terminal side. See Special Tools.
2. Turn ON the ignition, with the
engine OFF.

4 IMPORTANT: 0.7-2.5 V
Verify the J 33431-C resistance settings
with a DMM. See Special Tools.

3. Vary the resistance on the J 33431-C

from 40-250 ohms. See Special
Tools.
4. With the scan tool, observe the Fuel
Level Sensor Left Voltage parameter
in ECM EVAP Data list.
5. Refer to Fuel Level Specifications
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in order to convert from resistance to

Fuel Level Sensor Left voltage.

Does the Fuel Level Sensor Left voltage

parameter change smoothly across the Go to Step
specified range? Go to Step 5 11
Inspect for the following items:

A poor connection at the harness

connector of the suspect fuel level
sensor-Refer to Testing for
Intermittent Conditions and Poor
Connections and Connector
Repairs .

A high resistance in the fuel level
sensor signal primary signal circuit
5 or the low reference circuit between -
the fuel level sensors and C420

A high resistance in the fuel level
sensor signal secondary signal circuit
or the low reference circuit between
the fuel level sensors and C420

A misaligned fuel level sender

A deformed fuel tank

Go to Step
Did you find and correct the condition? 18 Go to Step 6
1. Remove the primary (left) fuel level
sender.
2. Inspect for the following items:

A stuck fuel level sensor, for
example, the fuel strainer
6 interfering with the sender float -
arm

Foreign material in the fuel
tank, i.e. ice
Go to Step
Did you find and correct the condition? 18 Go to Step 7
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1. With the DMM, measure the

resistance of the primary (left) fuel
level sensor while moving the float
arm. 40-250
7 2. Observe both the analog and digital ohms
displays on the DMM.

Does the resistance change smoothly Go to Step

across the specified range? Go to Step 8 14
1. Remove the secondary (right) fuel
level sender.
2. Inspect for the following items:

A stuck fuel level sensor-For
example, the fuel strainer
8 interfering with the sender float -
arm

Foreign material in the fuel
tank, i.e. ice
Go to Step
Did you find and correct the condition? 18 Go to Step 9
1. With the DMM, measure the
resistance of the secondary (right)
fuel level sensor while moving the
float arm.
40-250
9 2. Observe both the analog and digital ohms
displays on the DMM.
Go to
Does the resistance change smoothly Diagnostic Go to Step
across the specified range? Aids 15
Test the primary fuel level sensor signal
circuit for a high resistance. Refer to
10 -
Circuit Testing and Wiring Repairs . Go to Step Go to Step
Did you find and correct the condition? 18 12
Test the secondary fuel level sensor signal
circuit for a high resistance. Refer to
11 -
Circuit Testing and Wiring Repairs . Go to Step Go to Step
Did you find and correct the condition? 18 13

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Test the low reference circuit of the fuel

level sensors for a high resistance. Refer to
12 -
Circuit Testing and Wiring Repairs . Go to Step Go to Step
Did you find and correct the condition? 18 13
Inspect for poor connections at the harness
connector of the ECM. Refer to Circuit
13 -
Testing and Wiring Repairs . Go to Step Go to Step
Did you find and correct the condition? 18 17
Replace the primary (left) fuel level
sensor. Refer to Fuel Level Sensor
Replacement - Left for the 6.0L engine
14 - -
or to Fuel Level Sensor Replacement -
Left for the 7.0L engine. Go to Step
Did you complete the replacement? 18
Replace the secondary (right) fuel level
sensor. Refer to Fuel Level Sensor
Replacement - Right for the 6.0L engine
15 - -
or to Filler Tube Replacement for the
7.0L engine. Go to Step
Did you complete the replacement? 18
Replace the IPC. Refer to Control
Module References for replacement,
16 - -
setup, and programming. Go to Step
Did you complete the replacement? 18
Replace the ECM. Refer to Control
Module References for replacement,
17 - -
setup, and programming. Go to Step
Did you complete the replacement? 18
1. Use the scan tool in order to clear the
ECM DTCs.
18 2. Operate the system in order to verify -
the repair.

Did you correct the condition? System OK Go to Step 2

SPEEDOMETER AND/OR ODOMETER INACCURATE OR INOPERATIVE

Speedometer and/or Odometer Inaccurate or Inoperative

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Step Action Value(s) Yes No

Schematic Reference: Instrument Cluster Schematics
Did you perform the Diagnostic System Go to
Check - Vehicle? Diagnostic
System
1 - Check -
Vehicle in
Vehicle DTC
Go to Step 2 Information
1. Install a scan tool.
2. Raise the vehicle drive wheels. Refer
to Lifting and Jacking the Vehicle
in General Information.
3. Start the engine.
2 4. Place the transmission into drive. -
5. With the scan tool, observe the
Vehicle Speed Sensor parameter in
the ECM Engine Data 1 data list.

Does the Vehicle Speed Sensor parameter

match the speedometer display? Go to Step 3 Go to Step 4
Does the odometer operate properly? Go to Testing
for
Intermittent
Conditions
3 -
and Poor
Connections
in Wiring
Systems Go to Step 15
1. Turn the ignition OFF.
2. Disconnect the radio.
3. Start the engine.
4 4. Place the transmission into drive. -
5. With the scan tool, observe the
Vehicle Speed Sensor parameter in
the ECM Engine Data 1 data list.

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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Does the Vehicle Speed Sensor parameter

match the speedometer display? Go to Step 9 Go to Step 5
1. Turn the ignition OFF.
2. Disconnect the head up display
(HUD).
3. Start the engine.
5 4. Place the transmission into drive. -
5. With the scan tool, observe the
Vehicle Speed Sensor parameter.

Does the Vehicle Speed Sensor parameter

match the speedometer display? Go to Step 10 Go to Step 6
1. Turn the ignition OFF.
2. Disconnect the engine control
module (ECM) connector C1.
3. Turn the ignition ON.
6 4. Measure the voltage between the 9V
vehicle speed signal circuit and a
good ground.

Does the voltage measure greater than the

specified value? Go to Step 8 Go to Step 7
Test the vehicle speed signal circuit for an
open, high resistance, or a short to ground
between the instrument panel cluster
7 (IPC) and the ECM. Refer to Circuit -
Testing and Wiring Repairs in Wiring
Systems.
Did you find and correct the condition? Go to Step 17 Go to Step 11
Test the vehicle speed signal circuit for a
short to voltage between the IPC and the
8 ECM. Refer to Circuit Testing and -
Wiring Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 17 Go to Step 12
Inspect for poor connections at the harness
connector of the radio. Refer to Testing
for Intermittent Conditions and Poor
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Connections and Connector Repairs in

9 Wiring Systems. -
Did you find and correct the condition? Go to Step 17 Go to Step 13
Inspect for poor connections at the harness
connector of the HUD. Refer to Testing
for Intermittent Conditions and Poor
10 -
Connections and Connector Repairs in
Wiring Systems.
Did you find and correct the condition? Go to Step 17 Go to Step 14
Inspect for poor connections at the harness
connector of the IPC. Refer to Testing
for Intermittent Conditions and Poor
11 -
Connections and Connector Repairs in
Wiring Systems.
Did you find and correct the condition? Go to Step 17 Go to Step 15
Inspect for poor connections at the harness
connector of the ECM. Refer to Testing
for Intermittent Conditions and Poor
12 -
Connections and Connector Repairs in
Wiring Systems.
Did you find and correct the condition? Go to Step 17 Go to Step 16
Replace the radio. Refer to Control
Module References in
13 Computer/Integrating Systems for - -
replacement, setup, and programming.
Did you complete the replacement? Go to Step 17
Replace the HUD. Refer to Control
Module References in
14 Computer/Integrating Systems for - -
replacement, setup, and programming.
Did you complete the replacement? Go to Step 17
Replace the IPC. Refer to Control
Module References in
15 Computer/Integrating Systems for - -
replacement, setup, and programming.
Did you complete the replacement? Go to Step 17
Replace the ECM. Refer to Control
Module References in

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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Computer/Integrating Systems for

16 replacement, setup, and programming. - -
Did you complete the replacement? Go to Step 17
Operate the system in order to verify the
17 repair. -
Did you correct the condition? System OK Go to Step 2

TACHOMETER INACCURATE OR INOPERATIVE

Tachometer Inaccurate or Inoperative

Step Action Value(s) Yes No
Schematic Reference: Instrument Cluster Schematics
Did you perform the Diagnostic System Go to
Check - Vehicle? Diagnostic
System
1 - Check -
Vehicle in
Vehicle DTC
Go to Step 2 Information
1. Install a scan tool. Go to Testing
2. Start the engine. for
3. With the scan tool, observe the Intermittent
2 Engine Speed Signal parameter in - Conditions
the ECM Engine Data 1 data list. and Poor
Connections
Does the Engine Speed Signal parameter in Wiring
match the tachometer display? Systems Go to Step 3
1. Turn the ignition OFF.
2. Disconnect the head up display
(HUD).
3. Start the engine.
3 4. With the scan tool, observe the -
Engine Speed Signal parameter in
the ECM Engine Data 1 data list.

Does the Engine Speed Signal parameter

match the tachometer display? Go to Step 8 Go to Step 4

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1. Turn the ignition OFF.

2. Disconnect the engine control
module (ECM) connector C1.
3. Turn ON the ignition, with the
engine OFF.
4 9V
4. Measure the voltage from the engine
speed signal circuit to a good
ground.

Does the voltage measure greater than the

specified value? Go to Step 6 Go to Step 5
Test the engine speed signal circuit for an
open, high resistance, or a short to ground.
5 Refer to Circuit Testing and Wiring -
Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 13 Go to Step 7
Test the engine speed signal circuit for a
short to voltage. Refer to Circuit Testing
6 -
and Wiring Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 13 Go to Step 9
Inspect for poor connections at the harness
connector of the instrument panel cluster
(IPC). Refer to Testing for Intermittent
7 -
Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 13 Go to Step 10
Inspect for poor connections at the harness
connector of the HUD. Refer to Testing
for Intermittent Conditions and Poor
8 -
Connections and Connector Repairs in
Wiring Systems.
Did you find and correct the condition? Go to Step 13 Go to Step 11
Inspect for poor connections at the harness
connector of the ECM. Refer to Testing
for Intermittent Conditions and Poor
9 -
Connections and Connector Repairs in
Wiring Systems.
Did you find and correct the condition? Go to Step 13 Go to Step 12
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Replace the IPC. Refer to Control

Module References in
10 Computer/Integrating Systems for - -
replacement, setup, and programming.
Did you complete the replacement? Go to Step 13
Replace the HUD. Refer to Control
Module References in
11 Computer/Integrating Systems for - -
replacement, setup, and programming.
Did you complete the replacement? Go to Step 13
Replace the ECM. Refer to Control
Module References in
12 Computer/Integrating Systems for - -
replacement, setup, and programming.
Did you complete the replacement? Go to Step 13
Operate the system in order to verify the
13 repair. -
Did you correct the condition? System OK Go to Step 2

ENGINE OIL TEMPERATURE INDICATOR ALWAYS ON

Engine Oil Temperature Indicator Always On

Step Action Value(s) Yes No
Schematic Reference: Instrument Cluster Schematics
Connector End View Reference: Instrument Panel, Gages, and Console Connector
End Views, Engine Control Module (ECM) Connector End Views for the 6.0L engine,
or Engine Control Module (ECM) Connector End Views for the 7.0L engine
Did you perform the Diagnostic System Go to
Check - Vehicle? Diagnostic
1 - System
Check -
Go to Step 2 Vehicle
Start the engine. Go to Testing
Does the OIL TEMP HIGH message for
display in the DIC? Intermittent
2 -
Conditions
and Poor
Go to Step 3 Connections

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1. Install a scan tool.

2. With the scan tool, observe the
Engine Oil Temperature Calculated
parameter in the IPC ECM data list. 30-140°C
3
(86-284°F)
Does the Engine Oil Temperature
Calculated parameter display a value
within the specified range? Go to Step 8 Go to Step 4
1. Turn the ignition OFF.
2. Disconnect the engine oil
temperature switch.
3. Start the engine.
4 4. With the scan tool, observe the 30°C (86°F)
Engine Oil temperature Switch
parameter in the IPC ECM data list.

Does the Engine Oil Level parameter

display at or below the specified value? Go to Step 6 Go to Step 5
Test the signal circuit of the engine oil
temperature switch for a short to ground.
5 Refer to Circuit Testing and to Wiring -
Repairs .
Did you find and correct the condition? Go to Step 9 Go to Step 8
Inspect for poor connections at the harness
connector of the engine oil temperature
switch. Refer to Testing for Intermittent
6 -
Conditions and Poor Connections and
to Connector Repairs .
Did you find and correct the condition? Go to Step 9 Go to Step 7
Replace the engine oil temperature switch.
Refer to Engine Oil Level Sensor
and/or Switch Replacement for the 6.0L
7 engine or Engine Oil Level Sensor - -
and/or Switch Replacement for the 7.0L
engine.
Did you complete the replacement? Go to Step 9
Replace the IPC. Refer to Instrument
8 - -
Panel Cluster (IPC) Replacement.
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Did you complete the replacement? Go to Step 9

Operate the system in order to verify the
9 repair. -
Did you correct the condition? System OK Go to Step 2

LOW ENGINE OIL LEVEL INDICATOR ALWAYS ON

Low Engine Oil Level Indicator Always On

Step Action Value(s) Yes No
Schematic Reference: Instrument Cluster Schematics
Connector End View Reference: Instrument Panel, Gages, and Console Connector
End Views, Engine Control Module (ECM) Connector End Views for the 6.0L engine,
or Engine Control Module (ECM) Connector End Views for the 7.0L engine
Did you perform the Diagnostic System Go to
Check - Vehicle? Diagnostic
1 - System
Check -
Go to Step 2 Vehicle
Start the engine. Go to Testing
Does the CHECK OIL LEVEL message for
display in the DIC? Intermittent
2 -
Conditions
and Poor
Go to Step 3 Connections
1. Install a scan tool.
2. With the scan tool, observe the
Engine Oil Level Switch parameter
3 in the ECM data lists. -

Does the Engine Oil Level Switch Go to Step

parameter display OK? 10 Go to Step 4
1. Turn the ignition OFF.
2. Disconnect the engine oil level
switch.
4 3. Start the engine. -
4. With the scan tool, observe the
Engine Oil Level Switch parameter.

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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Does the Engine Oil Level parameter

display OK? Go to Step 6 Go to Step 5
Test the signal circuit of the engine oil
level switch for a short to ground. Refer to
5 -
Circuit Testing and to Wiring Repairs . Go to Step
Did you find and correct the condition? 11 Go to Step 7
Inspect for poor connections at the harness
connector of the engine oil level switch.
Refer to Testing for Intermittent
6 -
Conditions and Poor Connections and
to Connector Repairs . Go to Step
Did you find and correct the condition? 11 Go to Step 8
Inspect for poor connections at the harness
connector of the ECM. Refer to Testing
for Intermittent Conditions and Poor
7 -
Connections and to Connector
Repairs . Go to Step
Did you find and correct the condition? 11 Go to Step 9
Replace the engine oil level switch. Refer
to Engine Oil Level Sensor and/or
Switch Replacement for the 6.0L engine
8 - -
or Engine Oil Level Sensor and/or
Switch Replacement for the 7.0L engine. Go to Step
Did you complete the replacement? 11
Replace the ECM. Refer to Control
Module References for replacement,
9 - -
setup and programming. Go to Step
Did you complete the replacement? 11
Replace the IPC. Refer to Control
Module References for replacement,
10 - -
setup and programming. Go to Step
Did you complete the replacement? 11
Operate the system in order to verify the
11 repair. -
Did you correct the condition? System OK Go to Step 2

LOW ENGINE OIL LEVEL INDICATOR INOPERATIVE

Low Engine Oil Level Indicator Inoperative

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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Step Action Yes No

Schematic Reference: Instrument Cluster Schematics
Connector End View Reference: Instrument Panel, Gages, and Console Connector
End Views, Engine Control Module (ECM) Connector End Views for the 6.0L engine,
or Engine Control Module (ECM) Connector End Views for the 7.0L engine
Did you perform the Diagnostic System Check Go to Diagnostic
1 - Vehicle? System Check -
Go to Step 2 Vehicle
1. Turn ON the ignition.
2. With the scan tool, observe the Engine Oil
Level Switch parameter in the ECM data Go to Testing
2 list. for Intermittent
Conditions and
Does the Engine Oil Level Switch parameter Poor
display OK? Connections Go to Step 3
Replace the instrument panel cluster (IPC).
Refer to Control Module References for
3
replacement, setup, and programming.
Did you complete the replacement? Go to Step 4 -
Operate the system in order to verify the repair.
4
Did you correct the condition? System OK Go to Step 2

DRIVER INFORMATION CENTER (DIC) SWITCH(ES) INOPERATIVE

Driver Information Center (DIC) Switch(es) Inoperative

Step Action Value(s) Yes No
Schematic Reference: Instrument Cluster Schematics
Did you perform the Diagnostic System Go to
Check - Vehicle? Diagnostic
System
1 - Check -
Vehicle in
Vehicle DTC
Go to Step 2 Information
Inspect for poor connections at the driver
information center (DIC) switches. Refer
2 to Testing for Intermittent Conditions -
and Poor Connections and to Connector
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Repairs in Wiring Systems.

Did you find and correct the condition? Go to Step 4 Go to Step 3
Replace the instrument panel cluster (IPC).
Refer to Control Module References in
3 Computer/Integrating Systems for -
replacement, setup, and programming.
Did you complete the replacement? Go to Step 4 -
Operate the system in order to verify the
4 repair. -
Did you correct the condition? System OK Go to Step 2

HEAD UP DISPLAY (HUD) ALWAYS ON

Diagnostic Fault Information

IMPORTANT: Always perform the Diagnostic System Check - Vehicle .

Head Up Display (HUD) Always On

Short to Open/High Short to Signal
Circuit Ground Resistance Voltage Performance
HUD Battery Voltage Circuit - 2 - -
HUD Ground Circuit - 2 - -
HUD Switch Ground Circuit - 1 - -
1. Head Up Display (HUD) Always On
2. Head Up Display HUD Inoperative

Circuit/System Description

The head up display (HUD) is a secondary display system capable of reflecting important vehicle
information onto the windshield. The vehicle information is displayed using virtual imaging and is
reflected off the windshield in front of the driver. Battery positive voltage is the main power
source for the HUD system. However, the HUD system can only be enabled when the ignition is
active and in the RUN position. The HUD system receives all vehicle information to be displayed
via the class 2 serial data circuit. The HUD system interfaces with the HUD switch via discreet
circuits. The HUD switch is a normally open switch and ground is provided from within the HUD
switch when any switch press occurs.
Reference Information

Schematic Reference
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Head Up Display Schematics

Interior Lights Dimming Schematics

Connector End View Reference

Instrument Panel, Gages, and Console Connector End Views

Lighting Systems Connector End Views

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs
Scan Tool Reference

Scan Tool Data List

Circuit/System Testing

1. With the ignition OFF, turn the HUD dimmer down switch to the OFF position.
 If the HUD turns OFF, check for intermittent and poor connection at the harness
connector of the HUD.
2. Disconnect the HUD switch
3. Turn the ignition ON, with the engine OFF.
 If the HUD does not turn OFF, replace the head up display (HUD).

4. Connect a test lamp between the ground circuit of the HUD switch and battery positive
voltage.
 If the test lamp does not illuminate, check the HUD switch ground circuit for an open
or a high resistance.
 If the HUD switch ground circuit test normal, replace the HUD switch.

5. Connect a test lamp between the HUD dimmer down switch signal circuit and battery
positive voltage while pressing the HUD dimmer down switch.
 If the test lamp does not illuminate, check the HUD dimmer down switch signal circuit
for an open or a high resistance.
 If the HUD dimmer down switch signal circuit tests normal, replace the HUD switch.

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Repair Procedures

IMPORTANT: Always perform the Diagnostic Repair Verification after

completing the diagnostic procedure.

Switch Replacement - Ignition and Start, DIC Display and HUD Dimmer

Control Module References

HEAD UP DISPLAY (HUD) INOPERATIVE

Diagnostic Fault Information

IMPORTANT: Always perform the Diagnostic System Check - Vehicle .

Head Up Display (HUD) Inoperative

Short to Open/High Short to Signal
Circuit Ground Resistance Voltage Performance
HUD Battery Voltage Circuit - 2 - -
HUD Ground Circuit - 2 - -
HUD Switch Ground Circuit - 1 - -
1. Head Up Display (HUD) Always On
2. Head Up Display HUD Inoperative

Circuit/System Description

The head up display (HUD) is a secondary display system capable of reflecting important vehicle
information onto the windshield. The vehicle information is displayed using virtual imaging and is
reflected off the windshield in front of the driver. Battery positive voltage is the main power
source for the HUD system. However, the HUD system can only be enabled when the ignition is
active and in the RUN position. The HUD system receives all vehicle information to be displayed
via the class 2 serial data circuit. The HUD system interfaces with the HUD switch via discreet
circuits. The HUD switch is a normally open switch and ground is provided from within the HUD
switch when any switch press occurs.
Reference Information

Schematic Reference

Head Up Display Schematics

Interior Lights Dimming Schematics
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Connector End View Reference

Instrument Panel, Gages, and Console Connector End Views

Lighting Systems Connector End Views

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs
Scan Tool Reference

Scan Tool Data List

Circuit/System Testing

1. With the ignition ON, turn the HUD dimmer up switch to the full intensity.
 If the HUD display turns ON normally, check for an intermittent and poor connection
at the harness connector of the HUD.
2. With the ignition OFF, disconnect the HUD.
3. Connect a test lamp between the HUD battery positive voltage and a good ground.
4. Turn ON the ignition, with the engine OFF.
 If the test lamp does not illuminate, check the HUD battery positive voltage for an
open or a high resistance.
5. Connect a test lamp between the HUD battery positive voltage and the HUD ground circuit.
 If the test lamp does not illuminate, check the HUD ground circuit for an open or a
high resistance.
6. With the ignition turned OFF, disconnect the HUD switch.
7. Connect a test lamp between the HUD switch ground circuit and the HUD battery positive
voltage circuit.
8. Turn ON the ignition, with the engine OFF.
 If the test lamp does not illuminate, check the HUD switch ground circuit for an open
or a high resistance.
9. Connect a test lamp between the HUD dimmer up switch signal circuit and the HUD battery
positive voltage circuit while the HUD dimmer up switch is active.
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10. Turn ON the ignition, with the engine OFF.

 If the test lamp illuminates, replace the HUD.

If the test lamp does not illuminate, test the HUD dimmer up switch signal circuit for an
open or a high resistance.

If the HUD dimmer up switch signal circuit tests normal, replace the HUD switch.
Repair Procedures

IMPORTANT: Always perform the Diagnostic Repair Verification after

completing the diagnostic procedure.

Switch Replacement - Ignition and Start, DIC Display and HUD Dimmer

Control Module References

HEAD UP DISPLAY (HUD) IMAGE ADJUSTMENT INOPERATIVE

Head Up Display (HUD) Image Adjustment Inoperative

Step Action Yes No
Schematic Reference: Head Up Display Schematics
Did you perform the Diagnostic System Check Go to Diagnostic
- Vehicle? System Check -
1 Vehicle in
Vehicle DTC
Go to Step 2 Information
1. Turn ON the ignition, with the engine Go to Testing
OFF. for Intermittent
2 2. Adjust the head up display (HUD) UP, Conditions and
then DOWN. Poor
Connections in
Does the HUD display adjust properly? Wiring Systems Go to Step 3
1. Turn OFF the ignition.
2. Disconnect the HUD display connector.
3 3. Connect a test lamp between the HUD
display up circuit and B+ at the instrument
panel cluster (IPC). Refer to Circuit
Testing in Wiring Systems.
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4. Turn ON the ignition, with the engine

OFF.
5. Move the HUD up/down switch to the up
position.

Does the test lamp illuminate? Go to Step 4 Go to Step 5

1. Connect a test lamp between the HUD
display down circuit and B+ at the IPC.
Refer to Circuit Testing in Wiring
4 Systems.
2. Move the HUD up/down switch to the
DOWN position.

Does the test lamp illuminate? Go to Step 12 Go to Step 6

Test the HUD display up circuit for an open or
high resistance. Refer to Circuit Testing and
5
Wiring Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 15 Go to Step 9
Test the HUD display down circuit for an open,
a short to ground, or high resistance. Refer to
6 Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition? Go to Step 15 Go to Step 7
Test the HUD display switch down circuit for
an open or high resistance at the HUD switch.
7 Refer to Circuit Testing and Wiring Repairs
in Wiring Systems.
Did you find and correct the condition? Go to Step 15 Go to Step 8
Test the HUD display up circuit for a short to
ground. Refer to Circuit Testing and Wiring
8
Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 15 Go to Step 10
Test the HUD display up circuit for an open or
high resistance at the HUD switch. Refer to
9 Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition? Go to Step 15 Go to Step 10
Inspect for poor connections at the harness
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connector of the HUD dimmer switch. Refer to

Testing for Intermittent Conditions and
10 Poor Connections and Connector Repairs in
Wiring Systems.
Did you find and correct the condition? Go to Step 15 Go to Step 11
Replace the HUD dimmer switch. Refer to
Switch Replacement - Ignition and Start,
11
DIC Display and HUD Dimmer.
Did you find and correct the condition? Go to Step 15 Go to Step 14
Inspect for poor connections at the harness
connector of the HUD display. Refer to
Testing for Intermittent Conditions and
12
Poor Connections and Connector Repairs in
Wiring Systems.
Did you find and correct the condition? Go to Step 15 Go to Step 13
Replace the HUD display. Refer to Head Up
13 Display Replacement.
Did you complete the replacement? Go to Step 15 -
Replace the IPC. Refer to Control Module
References in Computer/Integrating Systems
14
for replacement, setup, and programming.
Did you complete the replacement? Go to Step 15 -
Operate the system in order to verify the repair.
15
Did you correct the condition? System OK Go to Step 2

HEAD UP DISPLAY (HUD) INTENSITY DOES NOT VARY

Head Up Display (HUD) Intensity Does Not Vary

Step Action Yes No
Schematic Reference: Head Up Display Schematics
Did you perform the Diagnostic System Check Go to Diagnostic
- Vehicle? System Check -
1 Vehicle in
Vehicle DTC
Go to Step 2 Information
1. Turn ON the ignition, with the engine
OFF.
Go to Testing
2. Adjust the head-up display (HUD) for Intermittent
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dimmer switch to full intensity, then back Conditions and

to full dim. Poor
2
Connections in
Does the HUD dim properly? Wiring Systems Go to Step 3
1. Turn OFF the ignition.
2. Disconnect the HUD display connector.
3. Turn ON the ignition, with the engine
OFF.
4. Connect a test lamp between the HUD
dim slider circuit and B+ at the instrument
3 panel cluster (IPC). Refer to Circuit
Testing in Wiring Systems.
5. Adjust the HUD to full intensity, then
back to full dim.

Does the test lamp go from full intensity then

dim? Go to Step 6 Go to Step 4
Test the HUD dim slider circuit for a short to
ground. Refer to Circuit Testing and Wiring
4
Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 8 Go to Step 5
Replace the HUD dimmer switch. Refer to
Switch Replacement - Ignition and Start,
5
DIC Display and HUD Dimmer.
Did you find and correct the condition? Go to Step 8 Go to Step 7
Replace the HUD. Refer to Control Module
References in Computer/Integrating Systems
6
for replacement, setup, and programming.
Did you complete the replacement? Go to Step 8 -
Replace the IPC. Refer to Control Module
References in Computer/Integrating Systems
7
for replacement, setup, and programming.
Did you complete the replacement? Go to Step 8 -
Operate the system in order to verify the repair.
8
Did you correct the condition? System OK Go to Step 2

CHIME ALWAYS ON

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Chime Always On
Step Action Yes No
Schematic Reference: Audible Warnings Schematics
Did you perform the Diagnostic System Go to Diagnostic
Check - Vehicle? System Check -
1 Vehicle in
Vehicle DTC
Go to Step 2 Information
Turn ON the ignition. Go to
Are any indicators/messages illuminated? Indicator/Warning
2 Message
Description and
Operation Go to Step 3
1. Turn OFF the ignition. Go to Testing
2. Turn the headlamp switch OFF. for Intermittent
Conditions and
3 3. Open the driver door. Poor
Connections in
Does the chime sound?
Go to Step 4 Wiring Systems
Replace the body control module (BCM).
Refer to Control Module References in
4 Computer/Integrating Systems for
replacement, setup, and programming.
Did you complete the replacement? Go to Step 5 -
1. Operate the system in order to verify the
repair.
5 2. Clear all DTCs.

Did you correct the condition? System OK Go to Step 1

CHIME INOPERATIVE

Chime Inoperative
Step Action Yes No
Schematic Reference: Audible Warnings Schematics
Did you perform the Diagnostic System Check
Go to Diagnostic
1 - Vehicle? System Check -
Vehicle in
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Vehicle DTC
Go to Step 2 Information
1. Turn ON the ignition. Go to Seat Belt
2. Buckle the driver seat belt. Indicator
2 Circuit
Is the fasten seat belt indicator inoperative? Malfunction in
Seat Belts Go to Step 3
Turn the headlamps ON. Go to Interior
Are the headlamps ON? Lighting
Systems
3
Description and
Operation in
Go to Step 4 Lighting Systems
Open the driver door. Go to Door Ajar
Does the driver information center (DIC) Indicator
4 display DOOR AJAR? Description and
Operation in
Go to Step 5 Doors
Replace the body control module (BCM).
Refer to Control Module References in
5 Computer/Integrating Systems for replacement,
setup, and programming.
Did you complete the replacement? Go to Step 6 -
Replace the instrument panel cluster (IPC).
Refer to Control Module References in
6 Computer/Integrating Systems for replacement,
setup, and programming.
Did you complete the replacement? Go to Step 7 -
Operate the system in order to verify the repair.
7
Did you correct the condition? System OK Go to Step 2

REPAIR INSTRUCTIONS
SWITCH REPLACEMENT - IGNITION AND START, DIC DISPLAY AND HUD DIMMER

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Fig. 10: Replacing Ignition and Start Switches, DIC Display and HUD Dimmer
Courtesy of GENERAL MOTORS CORP.

Switch Replacement - Ignition and Start, DIC Display and HUD Dimmer
Callout Component Name
NOTE:
Refer to Fastener Notice in Cautions and Notices.

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.

Ignition and Start Switch
Instrument Panel Cluster Trim Plate
1
Refer to Trim Panel Replacement - Instrument Panel (I/P) Cluster.
Ignition and Start Switch
6
Tip: Use a flat-bladed tool in order to release the switch from the trim plate.
Driver Information Display Switch
Instrument Panel Cluster Trim Plate
1
Refer to Trim Panel Replacement - Instrument Panel (I/P) Cluster.

2
Driver Information Display Switch Screws (Qty: 3)
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Tighten: 2 N.m (18 lb in)

3 Driver Information Display Switch
Head Up Display and Dimmer Switch
Instrument Panel Cluster Trim Plate
1
Refer to Trim Panel Replacement - Instrument Panel (I/P) Cluster.
Head Up Display and Dimmer Switch Screws (Qty: 3)
4
Tighten: 2 N.m (18 lb in)
5 Head Up Display and Dimmer Switch

HEAD UP DISPLAY REPLACEMENT

Removal Procedure

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Fig. 11: View Of HUD

Courtesy of GENERAL MOTORS CORP.

1. Disconnect the negative battery cable. Refer to Battery Negative Cable

Disconnect/Connect Procedure (7.0L) or Battery Negative Cable Disconnect/Connect
Procedure (6.0L) in Engine Electrical.
2. Remove the instrument panel (I/P) assembly. Refer to Instrument Panel (I/P) Assembly
Replacement.

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Fig. 12: View Of HUD

Courtesy of GENERAL MOTORS CORP.

3. Remove the retaining screw that secures the head up display (HUD) to the steering column
bracket.
4. Remove the HUD retaining nuts.
5. Remove the HUD from the vehicle.
Installation Procedure
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Fig. 13: Installing HUD Assembly

Courtesy of GENERAL MOTORS CORP.

1. Transfer the retaining screw and nut to the replacement HUD.

2. Install the HUD to the vehicle:
1. Install the HUD onto the dash panel mounting studs.
2. Slide the HUD retaining screw into the slot on the steering column bracket.

NOTE: Refer to Fastener Notice in Cautions and Notices.

3. Install the HUD retaining nuts.

Tighten: Tighten the nuts to 5 N.m (44 lb in).

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4. Tighten the screw that retains the HUD to the steering column bracket.

Tighten: Tighten the screw to 3 N.m (27 lb in).

5. Install the I/P assembly. Refer to Instrument Panel (I/P) Assembly Replacement.
6. Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect
Procedure (7.0L) or Battery Negative Cable Disconnect/Connect Procedure (6.0L) in
Engine Electrical.

CLOSEOUT/INSULATOR PANEL REPLACEMENT - INSTRUMENT PANEL (I/P) LOWER

Fig. 14: Replacing Closeout/Insulator Panel

Courtesy of GENERAL MOTORS CORP.

Closeout/Insulator Panel Replacement - Instrument Panel (I/P) Lower

Callout Component Name
Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.
Instrument Panel Insulator - Left
1 Retainer, Panel Assembly - Instrument Panel Insulator (Qty: 3)

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2 Panel Assembly, Instrument Panel Insulator - Left

Instrument Panel Insulator - Right
3 Retainer, Panel Assembly - Instrument Panel Insulator (Qty: 2)
4 Panel Assembly, Instrument Panel Insulator - Right

TRIM PANEL REPLACEMENT - KNEE BOLSTER

Fig. 15: Replacing Knee Bolster Trim Panel

Courtesy of GENERAL MOTORS CORP.

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Trim Panel Replacement - Knee Bolster

Callout Component Name
NOTE:
Refer to Fastener Notice in Cautions and Notices.

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.

Trim Plate, Instrument Panel Cluster
1
Refer to Trim Panel Replacement - Instrument Panel (I/P) Cluster.
Screw, Instrument Panel Knee Bolster (Qty: 2)
2
Tighten: 2 N.m (18 lb in)
3 Panel, Instrument Panel Knee Bolster
4 Clip, Instrument Panel Knee Bolster (Qty: 4)
Bolts, Instrument Panel Knee Bolster Brackets (Qty: 4)
5
Tighten: 2 N.m (18 lb in)
6 Bracket, Instrument Panel Knee Bolster

TRIM PLATE REPLACEMENT - INSTRUMENT PANEL (I/P) ACCESSORY

Fig. 16: Replacing Instrument Panel (I/P) Accessory Trim Plate

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Courtesy of GENERAL MOTORS CORP.

Trim Plate Replacement - Instrument Panel (I/P) Accessory

Callout Component Name
NOTE:
Refer to Fastener Notice in Cautions and Notices.

Fastener Tightening Specifications: Refer to Fastener Tightening

Specifications.Preliminary Procedure: Remove the right side console trim plate. Refer
to Console Trim Panel Replacement - Right.
Plate Assembly - Floor Console Trim
Tip:
1
1. Grasp the back edge of the trim and lift upward releasing the clips.
2. Disconnect the electrical connections.
2 Clip, Plate Assembly - Floor Console Trim (Qty: 2)
Bolt, Instrument Panel Accessory Trim Plate (Qty: 2)
3
Tighten: 3 N.m (27 lb in)
Plate Assembly - Instrument Panel Accessory Trim
Tip:
4 1. Grasp the back edge of the trim and lift upward and rearward releasing the
clips.
2. Disconnect all electrical connections.
5 Clip, Plate Assembly - Instrument Panel Accessory Trim (Qty: 6)

TRIM PANEL REPLACEMENT - INSTRUMENT PANEL (I/P) CLUSTER

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Fig. 17: Replacing Instrument Panel (I/P) Cluster Trim Panel

Courtesy of GENERAL MOTORS CORP.

Trim Panel Replacement - Instrument Panel (I/P) Cluster

Callout Component Name
Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.
Trim Plate, Instrument Panel Cluster
Tip:

1 1. Lower the steering column to its lowest position.

2. Pull outward on the lower edge of the trim panel in order to release the
lower clips.
3. Disconnect the electrical connections.
2 Clip, Instrument Panel Cluster Trim Plate (Qty: 6)

COMPARTMENT REPLACEMENT - INSTRUMENT PANEL (I/P)

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Fig. 18: Replacing Instrument Panel (I/P) Compartment

Courtesy of GENERAL MOTORS CORP.

Compartment Replacement - Instrument Panel (I/P)

Callout Component Name
NOTE:
Refer to Fastener Notice in Cautions and Notices.

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.

Instrument Panel Compartment Assembly
Compartment Assembly - Instrument Panel
Tip:
1
1. Open the instrument panel compartment.
2. Squeeze the sides of the compartment drawer and pull the compartment
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open past the stops.

3. Disconnect the electrical connections to the compartment.
4. Lift the compartment assembly from the compartment hinge.
Instrument Panel Compartment Trim Plate
1 Compartment Assembly - Instrument Panel
Screw, Instrument Panel Compartment Trim Plate Assembly (Qty: 3)
2
Tighten: 2 N.m (18 lb in)
3 Plate Assembly - Instrument Panel Compartment Trim
4 Clip, Instrument Panel Compartment Trim Plate (Qty: 2)
Instrument Panel Compartment Striker
5 Screws, Instrument Panel Compartment Striker (Qty: 4)
6 Striker, Instrument Panel Compartment
Instrument Panel Compartment Bumper
7 Bumper, Instrument Panel Compartment
Instrument Panel Compartment Handle Assembly
8 Bolt, Instrument Panel Compartment Handle Assembly (Qty: 2)
9 Handle Assembly - Instrument Panel Compartment
Instrument Panel Compartment Handle Lock Assembly
Lock Assembly - Instrument Panel Compartment Handle
Tip:
10
1. Insert a small pointed tool into the lock release hole.
2. Pull the lock assembly from the instrument panel compartment handle.
Instrument Panel Compartment Stop Bumpers
11 Stop Bumper, Instrument Panel Compartment
Instrument Panel Compartment Lamp Assembly
Lamp Assembly, Instrument Panel Compartment
Tip:

12 1. Open the instrument panel compartment.

2. Use a flat-bladed tool in order to release the lamp assembly from the
instrument panel compartment trim plate.
3. Disconnect the electrical connection.

DEFROSTER GRILLE REPLACEMENT

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Fig. 19: Replacing Defroster Grille

Courtesy of GENERAL MOTORS CORP.

Defroster Grille Replacement

Callout Component Name
Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.

Windshield Defroster Grille Assembly

Tip:
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1. Disconnect the sunload sensor electrical connector.

1 2. If replacing the defroster grille, transfer the sunload sensor to the new
grille.
2 Grill Assembly Clip (Qty: 4)

BRACKET REPLACEMENT - STEERING COLUMN

Removal Procedure

1. Disable the SIR system. Refer to the following procedures in SIR:

SIR Disabling and Enabling Zone 3

SIR Disabling and Enabling Zone 4

SIR Disabling and Enabling Zone 5

2. Disconnect the negative battery cable. Refer to Battery Negative Cable

Disconnect/Connect Procedure (7.0L) or Battery Negative Cable Disconnect/Connect
Procedure (6.0L) in Engine Electrical.
3. Remove the instrument panel (I/P) assembly. Refer to Instrument Panel (I/P) Assembly
Replacement.
4. Remove the upper and lower nuts retaining the steering column to the steering column
bracket. Carefully rest the steering column on the I/P lower support beam. Refer to
Steering Column Replacement in Steering Wheel and Column.

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Fig. 20: View Of Brake Master Cylinder Push Rod

Courtesy of GENERAL MOTORS CORP.

5. Remove the accelerator pedal assembly with the accelerator pedal position sensor.
6. Disconnect the brake master cylinder push rod from the brake pedal.
7. Remove the brake booster mounting nuts.

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Fig. 21: View Of Cruise Control Release Switch, Bracket & Bolts
Courtesy of GENERAL MOTORS CORP.

8. Remove the mounting bolts from the cruise control release switch bracket.
9. Reposition the cruise control release switch and the bracket.

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Fig. 22: View Of Master Cylinder Push Rod To Clutch Pedal

Courtesy of GENERAL MOTORS CORP.

10. Disconnect the master cylinder push rod from the clutch pedal.

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Fig. 23: View Of Steering Column Bracket & Bolts

Courtesy of GENERAL MOTORS CORP.

IMPORTANT: The following step ensures proper trim fit during installation.

11. Mark the location of the steering column bracket.

12. Remove the bolts which secure the steering column bracket to the I/P lower support beam.

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Fig. 24: View Of Steering Column Bracket, Bolts & I/P Upper Support Beam
Courtesy of GENERAL MOTORS CORP.

13. Remove the bolts which secure the steering column bracket to the I/P upper support beam.
14. Remove the steering column bracket.
Installation Procedure

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Fig. 25: View Of Steering Column Bracket, Bolts & I/P Upper Support Beam
Courtesy of GENERAL MOTORS CORP.

1. Install the steering column bracket into position as marked prior to removal.
2. Install the bolts which secure the steering column bracket to the I/P upper support beam. Do
NOT tighten the bolts.

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Fig. 26: View Of Steering Column Bracket & Bolts

Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to Fastener Notice in Cautions and Notices.

3. Install the bolts which secure the steering column bracket to the I/P lower support beam.

Tighten: Tighten both upper and locker bracket bolts to 10 N.m (89 lb in).

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Fig. 27: View Of Master Cylinder Push Rod To Clutch Pedal

Courtesy of GENERAL MOTORS CORP.

4. Connect the master cylinder push rod to the clutch pedal.

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Fig. 28: View Of Cruise Control Release Switch, Bracket & Bolts
Courtesy of GENERAL MOTORS CORP.

5. Position the cruise control release switch and bracket to the steering column bracket.
6. Install the bracket bolts to the cruise control release switch.

Tighten: Tighten the bracket bolts to 12 N.m (106 lb in).

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Fig. 29: View Of Brake Master Cylinder Push Rod

Courtesy of GENERAL MOTORS CORP.

7. Install the brake booster nuts.

Tighten: Tighten the nuts to 29 N.m (21 lb ft).

8. Connect the master cylinder push rod to the brake pedal.

9. Install the accelerator pedal assembly with the accelerator pedal position sensor.
10. Install the left windshield side garnish molding. Refer to Windshield Side Garnish
Molding Replacement in Interior Trim.
11. Install the steering column to the steering column bracket. Refer to Steering Column
Replacement in Steering Wheel and Column.
12. Install the console. Refer to Console Replacement.

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13. Install the I/P assembly. Refer to Instrument Panel (I/P) Assembly Replacement.
14. Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect
Procedure (7.0L) or Battery Negative Cable Disconnect/Connect Procedure (6.0L) in
Engine Electrical.
15. Enable the SIR system. Refer to the following procedures in SIR:

SIR Disabling and Enabling Zone 3

SIR Disabling and Enabling Zone 4

SIR Disabling and Enabling Zone 5

BRACKET REPLACEMENT - SIR

Removal Procedure

CAUTION: Refer to SIR Inflator Module Handling and Storage Caution in

Cautions and Notices.

1. Disable the SIR system. Refer to the following procedures in SIR:

SIR Disabling and Enabling Zone 3

SIR Disabling and Enabling Zone 4

SIR Disabling and Enabling Zone 5

2. Remove the instrument panel (I/P) assembly. Refer to Instrument Panel (I/P) Assembly
Replacement.
3. Remove the outlet duct from the right side window defogger.

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Fig. 30: View Of SIR Bracket Bolts

Courtesy of GENERAL MOTORS CORP.

4. Release the I/P harness retainer from the passenger SIR bracket.
5. Remove the connector position assurance (CPA) from the SIR module electrical connector.
6. Release the electrical connector retainer from the SIR bracket.
7. Disconnect the SIR module electrical connector.

IMPORTANT: The following steps are important to ensure proper trim fit

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during installation.

8. Mark the location of the knee bolster bracket.

9. Remove the bolts (3) retaining the knee bolster bracket to the center support bracket.
10. Remove the air distribution duct. Refer to Air Distribution Duct Replacement in
Heating, Ventilation and Air Conditioning.
11. Mark the location of the SIR bracket.
12. Remove the bolts (2) mounting the SIR bracket to the I/P lower support beam.
13. Remove the bolts (1) mounting the SIR bracket to the I/P upper support beam.
14. Remove the SIR bracket.

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Fig. 31: View Of SIR Module, Bracket & Retaining Nuts

Courtesy of GENERAL MOTORS CORP.

15. Mark the location of the SIR module in the SIR bracket.
16. Remove the SIR module retaining nuts (3).
17. Remove the SIR module (1) from the SIR bracket (2).
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Fig. 32: View Of Knee Bolster Bracket

Courtesy of GENERAL MOTORS CORP.

18. Remove the mounting bolts from the knee bolster bracket.
19. Remove the knee bolster bracket.
Installation Procedure

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Fig. 33: View Of Knee Bolster Bracket

Courtesy of GENERAL MOTORS CORP.

1. Install the knee bolster bracket into position as marked prior to removal.

NOTE: Refer to Fastener Notice in Cautions and Notices.

2. Install the retaining bolts which secure the knee bolster bracket to the SIR bracket.

Tighten: Tighten the bolts to 12 N.m (106 lb in).

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Fig. 34: View Of SIR Module, Bracket & Retaining Nuts

Courtesy of GENERAL MOTORS CORP.

3. Install the SIR module (1) to the SIR bracket (2) as marked prior to removal.
4. Install the SIR module retaining nuts (3).

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Tighten: Tighten the nuts to 10 N.m (89 lb in).

Fig. 35: View Of SIR Bracket Bolts

Courtesy of GENERAL MOTORS CORP.

5. Install the SIR bracket into position as marked prior to removal.

6. Install the bolts (1, 2) which secure the SIR bracket to the I/P upper and lower support
beams.

Tighten: Tighten the bolts to 12 N.m (106 lb in).

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7. Install the air distribution duct. Refer to Air Distribution Duct Replacement in Heating,
Ventilation and Air Conditioning.
8. Position the knee bolster bracket to the center support bracket as marked prior to removal.
9. Install the bolts (3) which secure the knee bolster bracket to the center support bracket.

Tighten: Tighten the bolts to 12 N.m (106 lb in).

10. Connect the SIR module electrical connector.

11. Secure the electrical connector retainer to the SIR bracket.
12. Install the CPA to the SIR module electrical connector.
13. Secure the I/P harness retainer to the SIR bracket.
14. Install the outlet duct to the right side window defogger.
15. Install the I/P assembly. Refer to Instrument Panel (I/P) Assembly Replacement.
16. Enable the SIR system. Refer to the following procedures in SIR:

SIR Disabling and Enabling Zone 3

SIR Disabling and Enabling Zone 4

SIR Disabling and Enabling Zone 5

INSTRUMENT PANEL CLUSTER (IPC) REPLACEMENT

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Fig. 36: Replacing Instrument Panel Cluster (IPC)

Courtesy of GENERAL MOTORS CORP.

Instrument Panel Cluster (IPC) Replacement

Callout Component Name
NOTE:
Refer to Fastener Notice in Cautions and Notices.

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.

Trim Plate, Instrument Panel Accessory
1
Refer to Trim Plate Replacement - Instrument Panel (I/P) Accessory.
2 Clip, Instrument Panel Accessory Trim Plate (Qty: 8)
Bolt, Instrument Panel Cluster (Qty: 4)
3
Tighten: 1.5 N.m (13 lb in)
4 Cluster, Instrument Panel

INSTRUMENT PANEL CLUSTER (IPC) INDICATOR LAMP REPLACEMENT

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Removal Procedure

The instrument panel cluster indicator lamps are service as part of the instrument panel cluster.
Refer to Instrument Panel Cluster (IPC) Replacement.

ASHTRAY REPLACEMENT

Fig. 37: Replacing Ashtray

Courtesy of GENERAL MOTORS CORP.

Ashtray Replacement
Callout Component Name
NOTE:
Refer to Fastener Notice in Cautions and Notices.

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.

Plate Assembly, Instrument Panel Accessory Trim
1
Refer to Trim Plate Replacement - Instrument Panel (I/P) Accessory.

Screws, Ashtray Assembly (Qty: 4)

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2 Tighten: 2 N.m (18 lb in)

3 Ashtray Assembly, Center Console

CUPHOLDER REPLACEMENT

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Fig. 38: Replacing Cupholder

Courtesy of GENERAL MOTORS CORP.
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Cupholder Replacement
Callout Component Name
NOTE:
Refer to Fastener Notice in Cautions and Notices.

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.

Plate Assembly, Instrument Panel Accessory Trim
1
Refer to Trim Plate Replacement - Instrument Panel (I/P) Accessory.
Screw, Cupholder (Qty: 4)
2
Tighten: 2 N.m (18 lb in)
3 Cupholder, Center Console
4 Guide, Center Console Cupholder (Qty: 2)
5 Door, Center Console Cupholder
Screw, Center Console Cupholder Bezel (Qty: 4)
6
Tighten: 2 N.m (18 lb in)
7 Bezel, Center Cupholder

INSTRUMENT PANEL (I/P) ASSEMBLY REPLACEMENT

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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Fig. 39: Replacing Instrument Panel (I/P) Assembly

Courtesy of GENERAL MOTORS CORP.

Instrument Panel (I/P) Assembly Replacement

Callout Component Name
NOTE:
Refer to Fastener Notice in Cautions and Notices.

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.

Preliminary Procedures

1. Disconnect the negative battery cable. Refer to Battery Negative Cable

Disconnect/Connect Procedure (7.0L) or Battery Negative Cable
Disconnect/Connect Procedure (6.0L) in Engine Electrical.
2. Disable the SIR system zones 3, 4, and 5. Refer to SIR Disabling and Enabling
Zone 3 , SIR Disabling and Enabling Zone 4 , or SIR Disabling and Enabling
Zone 5 in SIR.
3. Remove the windshield pillar garnish moldings. Refer to Windshield Side Garnish
Molding Replacement in Interior Trim.
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

4. Remove the defroster grille. Refer to Defroster Grille Replacement.

5. Remove the steering wheel. Refer to Steering Wheel Replacement .
6. Remove the instrument panel cluster. Refer to Instrument Panel Cluster (IPC)
Replacement.
7. Remove the instrument panel accessory trim plate. Refer to Trim Plate Replacement
- Instrument Panel (I/P) Accessory.
8. Remove the right console trim panel. Refer to Console Trim Panel Replacement -
Right.
9. Remove the radio assembly. Refer to Radio Replacement in Entertainment.
10. Remove the HVAC controller. Refer to HVAC Control Module Replacement in
HVAC Automatic Systems.
11. Remove the instrument panel insulators. Refer to Closeout/Insulator Panel
Replacement - Instrument Panel (I/P) Lower.
12. Remove the instrument panel driver knee bolster assembly. Refer to Trim Panel
Replacement - Knee Bolster.
Nut, Instrument Panel Assembly Trim Cover (Qty: 4)
1
Tighten: 10 N.m (89 lb in)
Screw, Instrument Panel Assembly (Qty: 3)
2
Tighten: 4 N.m (25 lb in)
Screw, Instrument Panel Assembly (Qty: 2)
3
Tighten: 4 N.m (25 lb in)
Screw, Instrument Panel Assembly (Qty: 1)
4
Tighten: 4 N.m (25 lb in)
Screw, Instrument Panel Assembly (Qty: 1)
5
Tighten: 4 N.m (25 lb in)
Screw, Instrument Panel Assembly (Qty: 2)
6
Tighten: 4 N.m (25 lb in)
Screw, Instrument Panel Assembly (Qty: 1)
7
Tighten: 4 N.m (25 lb in)
Screw, Instrument Panel Assembly (Qty: 1)
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

8 Tighten: 4 N.m (25 lb in)

Screw, Instrument Panel Assembly (Qty: 2)
9 Tip: Open the instrument panel compartment to access the screws.

Tighten: 4 N.m (25 lb in)

Screw, Instrument Panel Assembly (Qty: 2)
10 Tip: Open the instrument panel compartment to access the screws.

Tighten: 4 N.m (25 lb in)

Instrument Panel Assembly
Tip:

11 1. Lift the instrument panel assembly up and off of the upper and lower tie
bars and over the steering column.
2. Remove the instrument panel wiring harness.
3. Remove the instrument panel assembly from the vehicle.

DOOR REPLACEMENT - CONSOLE COMPARTMENT

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Fig. 40: Replacing Console Compartment Door

Courtesy of GENERAL MOTORS CORP.

Door Replacement - Console Compartment

Callout Component Name
NOTE:
Refer to Fastener Notice in Cautions and Notices.

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.

Screws, Console Door (Qty: 4)
1
Tighten: 2 N.m (18 lb in)
2 Door Assembly, Floor Console

CONSOLE COMPARTMENT DOOR HINGE REPLACEMENT

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Fig. 41: Replacing Console Compartment Door Hinge

Courtesy of GENERAL MOTORS CORP.

Console Compartment Door Hinge Replacement

Callout Component Name
NOTE:
Refer to Fastener Notice in Cautions and Notices.

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.

Screws, Console Door (Qty: 4)
1
Tighten: 2 N.m (18 lb in)
2 Door, Center Console
Console Assembly
3
Refer to Console Replacement.
Nut, Center Console Door Hinge (Qty: 4)
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

4 Tighten: 10 N.m (88 lb in)

5 Hinge, Center Console Door

LOCK CYLINDER REPLACE - CONSOLE COMPARTMENT DOOR

Removal Procedure

Fig. 42: Removing The Lock Cylinder Rod

Courtesy of GENERAL MOTORS CORP.

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1. Remove the Lock cylinder rod.

2. Remove the lock cylinder.

Squeeze the sides of the lock cylinder releasing the lock tabs.

Use a flat bladed tool to remove the lock cylinder from the console.

Installation Procedure

Fig. 43: Positioning The Lock Cylinder Within The Opening Of The Console
Courtesy of GENERAL MOTORS CORP.

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1. Position the lock cylinder within the opening of the console.

2. Push inward until the lock tabs secure the lock cylinder to the console. An audible "click"
noise should be heard.
3. Connect the Lock cylinder rod.

LATCH REPLACEMENT - CONSOLE COMPARTMENT DOOR

Fig. 44: Replacing Console Compartment Door Latch

Courtesy of GENERAL MOTORS CORP.

Latch Replacement - Console Compartment Door

Callout Component Name
NOTE:
Refer to Fastener Notice in Cautions and Notices.

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.

Console Door Screws (Qty: 7)
1
Tighten: 2 N.m (18 lb in)
2 Console Door Outer Cover
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

3 Console Door Latch

4 Console Door Latch Spring

CONSOLE TRIM PANEL REPLACEMENT - RIGHT

Fig. 45: Replacing Right Console Trim Panel

Courtesy of GENERAL MOTORS CORP.

Console Trim Panel Replacement - Right

Callout Component Name
NOTE:
Refer to Fastener Notice in Cautions and Notices.

Fastener Tightening Specifications: Refer to Fastener Tightening

Specifications.Preliminary Procedure: Remove the instrument panel accessory trim
plate. Refer to Trim Plate Replacement - Instrument Panel (I/P) Accessory.
1 Emergency Brake Lever Bezel
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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

Console Trim Panel Screws (Qty: 2)

2
Tighten: 2 N.m (18 lb in)
3 Console Trim Panel
4 Console Trim Panel Clip (Qty: 2)

CONSOLE REPLACEMENT

Fig. 46: Replacing Console

Courtesy of GENERAL MOTORS CORP.

Console Replacement
Callout Component Name
NOTE:
Refer to Fastener Notice in Cautions and Notices.

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.

Preliminary Procedures

1. Remove the instrument panel accessory trim plate. Refer to Trim Plate Replacement
- Instrument Panel (I/P) Accessory.
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2. Remove the center console trim plate. Refer to Console Trim Panel Replacement -
Right.
1 Front Floor Console Compartment Filler (Qty: 2)
Front Floor Console Bolt (Qty: 1)
2
Tighten: 12 N.m (106 lb in)
Front Floor Console Nuts (Qty: 2)
3
Tighten: 10 N.m (88 lb in)
Front Floor Console Assembly
4
Tip: Disconnect the electrical connectors.

DESCRIPTION AND OPERATION

INSTRUMENT PANEL CLUSTER (IPC) DESCRIPTION AND OPERATION

Displays Test

Certain instrument panel cluster (IPC) features are tested when the ignition is turned ON in order
to verify the features are working properly. The following occurs at key up:

The air bag indicator flashes 8 times.

The ABS indicator illuminates briefly.

The check engine indicator (MIL) illuminates briefly.

The brake indicator illuminates briefly.

All gages sweep.

The HUD illuminates all segments briefly.

The security indicator illuminates briefly.

The traction indicator illuminates briefly.

The tire inflation monitor indicator illuminates briefly.

The seat belt indicator illuminates.

The MPH or KM/H indicator illuminates.

The audible warning chimes 6 times.
Indicators and Warning Messages

Refer to Indicator/Warning Message Description and Operation.

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Engine Coolant Temperature Gage

The IPC displays the engine coolant temperature as determined by the engine control module
(ECM). The IPC receives a class 2 message from the ECM indicating the engine coolant
temperature. The engine coolant temperature gage defaults to 215°C (260°F) or below if:

The ECM detects a malfunction in the engine coolant temperature sensor circuit.

The IPC will display the engine coolant temperature message on the DIC.
Engine Oil Pressure Gage

The IPC displays the engine oil pressure as determined by the ECM. The IPC receives a class 2
message from the ECM indicating the engine oil pressure. The engine oil pressure gage defaults to
0 kPa (0 psi) or below if:

The ECM detects a malfunction in the engine oil pressure sensor circuit.

The IPC will display the low oil pressure message on the DIC.
Fuel Gage

The IPC displays the fuel level as determined by the ECM. The IPC receives a class 2 message
from the ECM indicating the fuel level percent. The fuel gage defaults to empty if:

The ECM detects a malfunction in the fuel level sensor circuit.

The IPC displays a low fuel message on the DIC.
Speedometer

The IPC displays the vehicle speed based on the information from the vehicle speed sensor. The
ECM converts the data from the vehicle speed sensor to a 4,000 pulses/mile signal. The IPC uses
the vehicle speed signal circuit (4,000 pulses/mile) from the ECM in order to calculate the
vehicle speed. The speedometer defaults to 0 km/h (0 mph) if a malfunction in the vehicle speed
signal circuit (4,000 pulses/mile) exists. The speedometer displays either miles or kilometers as
requested by the activation of the English/metric setting on the driver information center (DIC).
The associated indicator, MPH or KM/H, illuminates.
Tachometer

The IPC receives a discrete input from the ECM indicating vehicle speed. Each engine revolution
represents 2 input pulses to the ECM. The instantaneous engine speed is calculated by the ECM
using the time difference between the 2 input pulses. The tachometer will default to 0 RPM if:

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The ignition is in OFF, ACCESSORY, or CRANK.

The time duration since the last pulse is greater than or equal to one second.
Voltmeter

The IPC displays the system voltage as detected at the ignition 1 input of the DIC. The voltage on
the volt gage is also displayed on the DIC. The IPC displays high or low voltage when the DIC
detects voltage levels out of range. The DIC will issue the appropriate warning message.

INDICATOR/WARNING MESSAGE DESCRIPTION AND OPERATION

Indicators
Symbol Description
Refer to Skip Shift Description and
1 - 4 SHIFT
Operation

ABS: Refer to ABS Description and

Operation

Air Bag: Refer to SIR System Description

and Operation

Brake: Refer to ABS Description and

Operation

BRAKE
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Fasten Safety Belt: Refer to Seat Belt

System Description and Operation

Front Fog Lamps: Refer to Exterior

Lighting Systems Description and
Operation

Headlights On: Refer to Exterior Lighting

Systems Description and Operation

High Beam: Refer to Exterior Lighting

Systems Description and Operation

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MPH or KM/H: Refer to Indicator/Warning

MPH or KM/H
Message Description and Operation

Rear Fog Lamps: Refer to Exterior

Lighting Systems Description and
Operation

(Export Only)

SECURITY: Refer to Content Theft

Deterrent (CTD) Description and
Operation

Malfunction Indicator Lamp (MIL): Refer to

Engine Control Module (ECM)
Description for the 6.0L engine or Engine
Control Module (ECM) Description for
the 7.0L engine

CHECK ENGINE

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Tire Pressure Monitor: Refer to Tire

Pressure Monitor Description and
Operation

Traction Control Off: Refer to ABS

Description and Operation

Turn Signals: Refer to Exterior Lighting

Systems Description and Operation

DIC Warning Messages

Symbol Description
ABS ACTIVE Refer to ABS Description and Operation
ACTIVE HANDLING Refer to ABS Description and Operation
ACTIVE HANDLING CALIBRATING Refer to ABS Description and Operation
ACTIVE HANDLING ON/OFF Refer to ABS Description and Operation
ACTIVE HANDLING READY Refer to ABS Description and Operation
ACT HNDLG-WARMING UP Refer to ABS Description and Operation
BATTERY SAVER ACTIVE
Refer to Charging System Description
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and Operation
Refer to Charging System Description
BATTERY VOLTAGE LOW/HIGH
and Operation
Refer to Indicator/Warning Message
CHANGE ENGINE OIL
Description and Operation
Refer to Brake Warning System
CHECK BRAKE FLUID
Description and Operation
Refer to Cooling System Description and
CHECK COOLANT LEVEL
Operation
Evaporative Emission (EVAP) Control
System Description for the 6.0L engine
CHECK GAS CAP or
Evaporative Emission (EVAP) Control
System Description for the 7.0L engine
Refer to indicator warning message
CHECK OIL LEVEL
Description and Operation
Refer to Power Folding Top Description
CHECK POSITION OF CARGO DIVIDER
and Operation
Refer to Tire Pressure Monitor
CHECK TIRE PRESSURE
Description and Operation
Refer to Wiper/Washer System
CHECK WASHER FLUID
Description and Operation
Refer to Power Folding Top Description
CLOSE TRUNK TO MOVE TOP
and Operation
Refer to Cooling System Description and
COOLANT OVER TEMP
Operation
COMPETITIVE DRIVING MODE Refer to ABS Description and Operation
Refer to Cruise Control Description and
CRUISE DISENGAGED
Operation
Refer to Cruise Control Description and
CRUISE SET XX KM/H (XX MPH)
Operation
Refer to Door Ajar Indicator Description
DRIVER/PASSENGER DOOR AJAR
and Operation
ENGINE DRAG CONTROL ACTIVE Refer to ABS Description and Operation
Refer to Cooling System Description and
ENGINE OVERHEATED - STOP ENGINE
Operation

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2006 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, and Console - Corvette

ENGINE PROTECTION, REDUCE Refer to Engine Control Module (ECM)

ENGINE RPM Description
Refer to Keyless Entry System
FOB AUTOLEARN WAIT XX MINUTES
Description and Operation
Refer to Keyless Entry System
FOB BATTERY LOW
Description and Operation
Refer to Exterior Lighting Systems
HEADLAMPS SUGGESTED
Description and Operation
Refer to Tire Pressure Monitor
HIGH TIRE PRESSURE-XX
Description and Operation
Refer to Cooling System Description and
HOT ENGINE-A/C OFF
Operation
Refer to Indicator/Warning Message
ICE POSSIBLE
Description and Operation
Refer to Content Theft Deterrent (CTD)
INTRUSION SENSOR (OFF/ON)
Description and Operation
Refer to Keyless Entry System
KNOWN FOB
Description and Operation
Refer to Indicator/Warning Message
LOW FUEL
Description and Operation
Refer to Indicator/Warning Message
LOW OIL LEVEL
Description and Operation
Refer to Indicator/Warning Message
LOW OIL PRESSURE
Description and Operation
Refer to Tire Pressure Monitor
LOW TIRE PRESSURE-XX
Description and Operation
Refer to Keyless Entry System
MAXIMUM # FOBS LEARNED
Description and Operation
Refer to Electronic Suspension Control
MAXIMUM SPEED 129 KM/H (80 MPH)
Description and Operation
Refer to Keyless Entry System
NO FOB, OFF OR RUN?
Description and Operation
Refer to Keyless Entry System
NO FOBS DETECTED
Description and Operation
Refer to Keyless Entry System
OFF-ACC TO LEARN
Description and Operation

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OVER SPEED WARNING CHECK ENGINE: Refer to Engine

(gulf states export) Control Module (ECM) Description
PRESS BRAKE TO START ENGINERefer to ABS Description and Operation
Refer to Keyless Entry System
READY FOR FOB #X
Description and Operation
Refer to Throttle Actuator Control
(TAC) System Description for the 6.0L
engine
REDUCED ENGINE POWER
or
Throttle Actuator Control (TAC)
System Description for the 7.0L engine
SERVICE ABS Refer to ABS Description and Operation
Refer to Air Temperature Description
SERVICE A/C
and Operation
SERVICE ACTIVE HNDLG Refer to ABS Description and Operation
Refer to Charging System Description
SERVICE CHARGING SYSTEM
and Operation
Refer to Steering Wheel and Column
SERVICE COLUMN LOCK
Description and Operation
Refer to Charging System Description
SERVICE ELECT SYSTEM
and Operation
Refer to Fuel System Description and
SERVICE FUEL SYSTEM Evaporative Emission (EVAP) Control
System Description
Refer to Electronic Suspension Control
SERVICE RIDE CONTROL
Description and Operation
Refer to Tire Pressure Monitor
SERVICE TIRE MONITOR
Description and Operation
SERVICE TRACTION SYSTEM Refer to ABS Description and Operation
Refer to Automatic Transmission Shift
SERVICE TRANSMISSION Lock Control Description and
Operation
Refer to Indicator/Warning Message
SERVICE VEHICLE SOON
Description and Operation
Refer to Memory Seats Description and
SET PARK BRAKE FOR SEAT RECALL
Operation

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Refer to Power Folding Top Description

SET PARK BRAKE TO MOVE TOP
and Operation
Refer to Automatic Transmission Shift
SHIFT TO PARK Lock Control Description and
Operation
SHIFT TO PARK OR SET PARK BRAKE Refer to Power Folding Top Description
TO MOVE TOP and Operation
Refer to Skip Shift Description and
SHIFT TO REVERSE Operation and Manual Transmission
Description and Operation
Refer to Electronic Suspension Control
SHOCKS INOPERATIVE
Description and Operation
(XX) TIRE FLAT MAX SPEED 55, Refer to Tire Pressure Monitor
REDUCE HANDLING Description and Operation
Refer to Power Folding Top Description
TONNEAU AJAR
and Operation
Refer to Power Folding Top Description
TOO COLD TO MOVE TOP
and Operation
Refer to Power Folding Top Description
TOO FAST FOR TOP
and Operation
Refer to Power Folding Top Description
TOP MOTOR OVER TEMP
and Operation
Refer to Power Folding Top Description
TOP NOT SECURE
and Operation
TRACTION SYS ACTIVE Refer to ABS Description and Operation
TRACTION SYSTEM AND ACTIVE
Refer to ABS Description and Operation
HANDLING ON/OFF
TRACTION SYSTEM ON/OFF Refer to ABS Description and Operation
Refer to Transmission Indicators and
TRANSMISSION HOT IDLE ENGINE
Messages
Refer to Luggage Compartment
Description and Operation (Coupe) or
TRUNK AJAR
Luggage Compartment Description and
Operation (Convertible and Z06)
Refer to Exterior Lighting Systems
TURN SIGNAL ON
Description and Operation

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Refer to Power Folding Top Description

UNLATCH HEADER TO MOVE TOP
and Operation
Refer to Skip Shift Description and
UPSHIFT NOW Operation and Manual Transmission
Description and Operation

CHANGE ENGINE OIL

The instrument panel cluster (IPC) illuminates the CHANGE ENGINE OIL message in the driver
information center (DIC) when the engine control module (ECM) determines that the engine oil
needs to be changed. The PCM sends a class 2 message to the IPC requesting illumination. After
the oil is changed, reset the engine oil monitor. Refer to GM Oil Life System - Resetting .
CHECK ENGINE

The instrument panel cluster (IPC) illuminates the malfunction indicator lamp control module
(MIL) telltale when the engine control module (ECM) detects a malfunction in the engine
emission system. The MIL indicates that an emission related malfunction has occurred and vehicle
service is required. The MIL telltale is hardwired to the ECM and the ECM will ground the MIL
control circuit when it wants the indicator illuminated in the IPC. Refer to Engine Control
Module (ECM) Description .
CHECK OIL LEVEL

The instrument panel cluster (IPC) illuminates the CHECK OIL LEVEL message in the driver
information center (DIC) when the engine control module (ECM) detects low engine oil level,
and the signal circuit is high. The ECM only monitors the signal circuit of the engine oil level
switch for a brief period when the key moves from ON to START. The IPC receives a class 2
message requesting illumination from the ECM.
ICE POSSIBLE

The driver information center (DIC) illuminates the ICE POSSIBLE message when the outside
air temperature drops below 2°C (36°F). When the temperature rises above 5.5°C (42°F) the ICE
POSSIBLE message turns off. The IPC receives a class 2 message indicating the outside air
temperature from the body control module (BCM).
Km/h and MPH Indicator(s)

km/h

The instrument panel cluster (IPC) illuminates the km/h indicator when the IPC detects that
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metric units have been requested. The IPC monitors the signal circuit of the ENG/MET
switch. The IPC sends a class 2 message indicating the requested units to the head up display
(HUD).

MPH

The IPC illuminates the mph indicator when the IPC detects that English units have been
requested. The IPC monitors the signal circuit of the ENG/MET switch. The IPC sends a
class 2 message indicating the requested units to the head up display (HUD).
LOW FUEL

The instrument panel cluster (IPC) illuminates the LOW FUEL message in the driver information
center (DIC) when the ECM detects that the fuel level is less than a pre-determined value. The
IPC receives a class 2 message from the ECM indicating the fuel level.
LOW OIL PRESSURE

The instrument panel cluster (IPC) illuminates the LOW OIL PRESSURE message in the driver
information center (DIC) when the ECM detects low engine oil pressure, and the signal circuit is
low. The IPC receives a class 2 message requesting illumination from the ECM.
SERVICE VEHICLE SOON

The driver information center (DIC) illuminates the SERVICE VEHICLE SOON message in the
DIC when the IPC detects certain malfunctions like the ABS system failure or the system power
mode failure. The IPC illumination from the engine control module (ECM).

DRIVER INFORMATION CENTER (DIC) DESCRIPTION AND OPERATION

The driver information center (DIC) displays the driver identifier greeting for 5 seconds when it
first powers up. If enabled through Personalization, the DIC then returns to the last display status
before no power condition.

There are 6 buttons on the DIC.

Info Up

Info Down

Info Reset

English/Metric (non HUD)

Trip Reset (non HUD)
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Info Up

The Info Up button is used in order to scroll the DIC displays and acknowledge warnings.
Info Down

The Info Down button is used in order to scroll the DIC displays and acknowledge warnings.

Info Up or Info Down is used to navigate through the following DIC Displays:

Fuel Range

Average Fuel Economy

Instantaneous Fuel Economy

Fuel Used

Average Speed

Elapsed Time

Battery Voltage

Tire Pressure LF

Tire Pressure RF

Tire Pressure LR

Tire Pressure RR

Oil Life Remaining

English/Metric

Blank Display

Vehicle Speed (non HUD vehicle)

Odometer

Trip A

Trip B
Average Fuel Economy

Average fuel economy is calculated using the equation: AFE = Distance/Fuel

Distance = The accumulated distance travelled since the last reset of this value

Fuel = The accumulated fuel consumption since the last reset of this value

The ECM sends the average fuel economy GMLAN message to the IPM. The instrument panel
cluster (IPC) receives a GMLAN message from the instrument panel module (IPM) regarding
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fuel usage information. The value of this mode is retained during ignition OFF and can be
changed between English units and metric units by pressing the English/Metric button on the DIC
switch. Press and hold the Info button on the driver information center (DIC) switch for 1 second
in order to reset the AFE display.
Average Speed

Average speed is calculated using the equation: Average Speed = Distance/Ignition On

Distance = The accumulated distance travelled since the last reset of this value

Ignition On = The accumulated ignition on time since the last reset of this value

Ignition on time is measured from the time that the ignition is turned ON to the time when the
ignition is turned OFF. The value of this mode is retained during ignition OFF. Press and hold the
Reset button on the DIC switch for 1 second in order to reset the average speed display.
Battery Voltage

The instrument panel cluster (IPC) receives a GMLAN message from the instrument panel
module (IPM) for battery voltage data. The gage on the IPC displays similar battery voltage
values. When the battery voltage is below the normal operating range, the DIC displays LOW and
the actual battery voltage. When the battery voltage is greater than the normal operating range,
the driver information center (DIC) displays HIGH and the actual battery voltage. The charging
system indicator also illuminates when the battery voltage is outside the normal operating range.
Oil Life Remaining

The engine control module (ECM) sends the oil life remaining percentage to the instrument panel
module (IPM) via GMLAN message. The instrument panel cluster receives a GMLAN message
from the IPM indicating the engine oil life remaining. The driver information center (DIC)
displays the current percentage of the GM Oil Life System as determined by the ECM. When the
oil life remaining percentage drops below 5 percent, the DIC displays CHANGE ENGINE OIL
SOON. When the engine oil is changed, reset the GM Oil Life System. Press and hold the
RESET button on the DIC switch for at least 3 seconds until the DIC displays 100 percent.
Fuel Range

This message indicates the estimated distance that the vehicle can travel under the current fuel
economy and fuel level conditions since the last battery connection to the IPC. Fuel Range is
calculated using the equation: Fuel Range = Distance Sum/Fuel Sum.

Distance Sum = The accumulated distance travelled since the last reset of this value.
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Fuel Sum = The accumulated fuel delivered since the last reset of this value

The ECM sends the fuel range value to the instrument panel module (IPM). The instrument panel
cluster (IPC) receives a GMLAN message from the instrument panel module (IPM) with fuel
information. The fuel range value is retained during ignition OFF and can be changed between
English and Metric units by pressing the English/Metric button on the driver information center
(DIC) switch. The Fuel Range display cannot be reset. Whenever the calculated fuel range is less
than 64 Km/h (39.8 miles) RANGE-LOW is displayed.
Fuel Used

The instrument panel cluster (IPC) calculates and displays the total amount of fuel used since the
last reset of the value.

The engine control module (ECM) sends the fuel used value to the instrument panel module
(IPM) via GMLAN message. The IPC receives a GMLAN message from the instrument panel
module (IPM) with fuel information. The fuel used value is retained during ignition OFF and can
be changed between English and Metric units by pressing the English/Metric button on the driver
information center (DIC) switch. Press and hold the RESET button on the DIC switch for one
second in order to reset the Fuel Used display.
Instantaneous Fuel Economy (IFE)

Instantaneous fuel economy (IFE) is calculated using the equation: IFE = Distance/Fuel.

Distance = The accumulated distance travelled for the last 2 seconds

Fuel = The accumulated fuel delivered for the last 2 seconds

The instrument panel cluster (IPC) receives a GMLAN message from the instrument panel
module (IPM) with fuel information. The distance information is calculated by the IPC using the
vehicle speed information from the ECM. These values are retained during ignition OFF and can
be changed between English and Metric units by pressing the English/Metric button on the driver
information center (DIC) switch. The IFE display cannot be reset.
Timer

The timer records elapsed time starting from activation. When the driver information center
(DIC) displays the timer, pressing the INFO RESET button for 1.0 seconds on the DIC resets the
timer. Pressing the INFO RESET button on the DIC switch for approximately 1.0 seconds starts
and stops the timer. The DIC displays the timer in one of the following formats:

XX:XX:XX TIMER (ON)

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XX:XX:XX TIMER (OFF)

The first XX represents hours elapsed, the second XX represents minutes elapsed, and the third
XX represents seconds elapsed. The ON or OFF indicates whether the timer is currently running.
The maximum range of the timer is 99 hours, 59 minutes, and 59 seconds. After the maximum
range is reached, the timer displays all zeros (00:00:00).
Tire Pressure Monitor

The instrument panel cluster (IPC) receives a GMLAN message from the tire pressure monitoring
(TPM) system for front and rear tire pressure data. The driver information center (DIC) will
display the pressure for each of the front and rear tires. When a tire with low air pressure is
present, the DIC displays XX TIRE PRESSURE LOW.

Fuel Display
Parameter Update Rate Range Reset Value Units
Average Fuel MPG or L/100
1.0 seconds 0.0-99.9 99.9
Economy KM
Instant Fuel MPG or L/100
2.0 second 0-70 N/A
Economy KM
Fuel Range 1.0 second 0-999 N/A MI/KM
Fuel Used 1 second 0-999.9 0.0 Gal/L

Gage Display
Parameter Update Rate Range Reset Value Units
Battery Volts 2 seconds 0-18 N/A Volts
Front 2 seconds 0-999 N/A KPA or PSI
Rear 2 seconds 0-999 N/A KPA or PSI

Trip Display
Range
DIC Trip Display Metric English
ODOMETER 0.0-999999 km 0-999999 mi
TRIP A 0.0-1999.9 km (Export) 0.0-999.9 mi (Domestic)
TRIP B 0.0-1999.9 km (Export) 0.0-999.9 mi (Domestic)

Info Reset

Press the Reset button on the driver information center (DIC) switch for 1 second in order to
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acknowledge and/or reset the current DIC display. For engine oil life reset, it takes at least 3
seconds.
English/Metric Button

The English/Metric button is used to toggle between English and Metric unit systems.
Trip Reset

Press the trip reset button for greater than 1.0 seconds to reset the currently displayed trip
odometer.

HEAD UP DISPLAY (HUD) DESCRIPTION AND OPERATION

The head up display (HUD) is a secondary display system that reflects vehicle information onto
the windshield. The HUD system consists of the following:

The indicator displays

The vehicle speed display

Engine Speed Display

The radio display

The control switches

Arbitrary Messages/Texts
Indicator Displays

The HUD displays the following:

CHECK GAGES indicator

Engine coolant temperature indicator

Engine oil pressure indicator

Engine oil temperature indicator

G-Force Indicator

High beam indicator

Km/h (MPH) indicator

Low fuel indicator

Turn signal indicators

Transmission oil temperature

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Tap Up/Tap down indicator

Upshift indicator

Refer to Indicator/Warning Message Description and Operation.

Vehicle Speed Display

The HUD displays the vehicle speed based on information from the vehicle speed sensor. The
powertrain control module (PCM)/engine control module (ECM) converts the data from the
vehicle speed sensor to a 4,000 pulses/mile signal. The HUD uses the vehicle speed signal circuit
(4,000 pulses/mile) from the PCM in order to calculate the vehicle speed. The HUD displays
either miles or kilometers as requested by the activation of the English/metric button in the DIC
switch. The associated indicator (km/h or MPH) illuminates.
Engine Speed Display

The HUD displays the engine speed based on information from the PCM/ECM. The HUD
receives a class 2 message from the PCM/ECM indicating the engine speed. Each engine
revolution represents input pulses to the PCM/ECM. The instantaneous engine speed is calculated
by the PCM/ECM using the time difference between the 2 input pulses.
Radio Display

The HUD displays the following radio information:

The radio frequency and the band

The CD disc (for multiple changer) and the CD track

The cassette symbol

The HUD receives class 2 messages from the radio indicating the display mode, the frequency, the
band, and the CD track. The HUD receives a class 2 message from the remote playback device -
CD changer indicating the current CD disc number and the CD track.
Control Switches

The HUD switch consists of the following controls:

HUD image adjustment switch

HUD display dimming switch

HUD display page switch

HUD display mode switch
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The vertical image adjust up switch and the vertical image adjust down switch controls the height
adjustment of the image on the windshield.

The HUD display dimming switch is used to control the brightness of the HUD display and the
forward facing ambient light sensor. Pressing and holding the switch initiates a smooth increase or
decrease in HUD intensity until MAX/OFF intensity is achieved.

The HUD display page switch allows a driver to scroll through and select a style of display page

The HUD display mode switch allows the driver to select or sort through the available HUD
mode formats.

AUDIBLE WARNINGS DESCRIPTION AND OPERATION

The audible warnings alert the driver of a system concern or a critical vehicle condition. The
radio generates the audible warnings through the left front speaker. The radio receives audible
warning requests via the class 2 serial data line. If the radio receives multiple audible warning
requests, the warning with the highest priority sounds first. The following lists the audible
warning priority and the pulse rate:

1. Fast rate chime-200 pulses per minute

2. Medium rate chime-150 pulses per minute
3. Slow rate chime-50 pulses per minute
4. Single chime
Fasten Safety Belt Warning

The radio activates the fasten safety belt audible warning as requested by the dash integration
module (DIM). The DIM sends a class 2 message to the radio indicating the chime frequency at a
slow rate and a duration of 8 seconds. The fasten safety belt warning sounds and the fasten safety
belt indicator illuminates when the following occurs:

The ignition switch transitions to ON.

The inflatable restraint sensing and diagnostic module (SDM) detects that the drivers seat
belt is not buckled and the signal is low. The SDM sends a class 2 message to the DIM
indicating the seat belt status. The instrument panel (IPC) receives a class 2 message from
the DIM indicating the driver seat belt status.

If the seat belt is buckled when the ignition is turned on, the chime does not sound. If the seat belt
is buckled while the chime is sounding, the chime stops. If the seat belt is unbuckled after the
initial transition to ON, the chime does not sound.
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Key-In-Ignition Warning

The radio activates the key-in-ignition audible warning as requested by the dash integration
module (DIM). The DIM sends a class 2 message to the radio indicating the chime frequency of a
medium rate and at a continuous duration. The key-in-ignition warning sounds when the
following occurs:

The ignition switch is OFF.

The dash integration module (DIM) determines that the driver door is open and the signal
circuit is low.

The DIM determines that the key-in-ignition switch is closed and the signal circuit is low.
Lights On Warning

The radio activates the lights on warning as requested by the dash integration module (DIM). The
DIM sends a class 2 message to the radio indicating the chime frequency of a fast rate and at a
continuous duration. The lights on warning sounds when the following occurs:

The ignition is OFF.

The DIM determines that the driver door is open and the signal circuit is low.

The DIM determines that the headlamp switch is in the park or head position.
Park Brake Warning

The radio activates the park brake audible warning as requested by the dash integration module
(DIM). The DIM sends a class 2 message to the radio indicating the chime frequency of a fast rate
and at a continuous duration. The park brake warning sounds and the BRAKE indicator
illuminates when the following occurs:

The ignition is on.

The vehicle speed is greater than 5 km/h (3.1 mph). The DIM receives a class 2 message
from the engine control module (ECM) indicating the vehicle speed.

The DIM determines that the park brake is engaged and the signal circuit is low.
Additional Warnings

The following warnings have an associated instrument panel cluster (IPC) indicator:

Change Oil Now

Change Oil Soon

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Hot Coolant Temperature

The radio activates the audible warning as requested by the dash integration module (DIM).
The IPC sends a class 2 message to the radio indicating the chime frequency of a medium
rate) and at a continuous duration.

Low Fuel

The radio activates the audible warning as requested by the DIM. The DIM sends a class 2
message to the radio indicating the chime frequency of a medium rate and at a continuous
duration.

Refer to Indicator/Warning Message Description and Operation.

SPECIAL TOOLS AND EQUIPMENT

SPECIAL TOOLS

Special Tools
Illustration Tool Number/ Description

J 33431-C
Signal Generator and Instrument Panel Tester

J 39200
Digital Multimeter

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