INSTRUMENT PANEL -1998 Chevrolet S10 Pickup Page 1 of 30

ARTICLE BEGINNING

DESCRIPTION & OPERATION

WARNING: Deactivate air bag system before performing any service operation.
See AIR BAG RESTRAINT SYSTEMS article. DO NOT apply electrical
power to any component on steering column without first
deactivating air bag system. Air bag may deploy.

Instrument Panel Cluster (IPC) contains a microprocessor. Communication with other modules is
transmitted over Class 2 serial data bus. Instrument cluster gauges and indicators are provided
input from microprocessor or directly from sending units or sensors. See Fig. 1 . Illumination
lights, plugged into back of cluster, are serviceable, but no other components on cluster are
serviceable. If any component on cluster is faulty, replace cluster.

Fig. 1: Identifying Instrument Components

Courtesy of GENERAL MOTORS CORP.

GAUGES

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Coolant Temperature

Gauge is IPC controlled using Vehicle Control Module/Powertrain Control Module (VCM/PCM)
data on Class 2 serial data line. VCM/PCM receives information from resistance of coolant
temperature sensor. As coolant temperature increases, sensor resistance decreases.

Fuel

Gauge is IPC controlled using VCM/PCM data on Class 2 serial data line. VCM/PCM receives
information from resistance of fuel tank sending unit. As fuel level increases, sending unit
resistance increases.

Oil Pressure

Gauge responds directly to resistance of oil pressure sending unit. As oil pressure increases,
sending unit resistance increases. IPC monitors circuit to determine if Check Gauges indicator
should illuminate.

Speedometer

Gauge is IPC controlled using VCM/PCM data on Class 2 serial data line. Vehicle Speed Sensor
(VSS) produces voltage pulses of frequency proportional to vehicle speed. This signal is processed
by PCM/VCM to produce a voltage pulse signal to IPC.

NOTE: Incorrect VSS calibration may adversely affect operation of ABS,

engine control system and cruise control system.

Tachometer

Gauge is IPC controlled using VCM/PCM data on Class 2 serial data line.

Voltmeter

Voltmeter indicates battery voltage (ignition on, engine off) or charging system voltage (engine
on).

INDICATOR LIGHTS

NOTE: Light Emitting Diodes (LEDs) are used instead of bulbs.

AIR BAG

LED is controlled by Supplemental Inflatable Restraint (SIR) Diagnostic Energy Reserve Module
(DERM) on Class 2 serial data line. As a check, LED flashes 7 times after ignition is turned on.

ANTI-LOCK

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LED is controlled by IPC, using information sent by Truck Body Control (TBC) module and/or
Anti-lock Brake System (ABS) module on Class 2 serial data line. If light is on, brake system will
still operate, but without anti-lock assistance. As a check, LED illuminates for 3 seconds after
ignition is turned on.

WARNING: If BRAKE light is on, ensure brake hydraulic system is okay before
driving vehicle.

BRAKE

BRAKE LED is controlled by Truck Body Control (TBC) module and/or Electronic Brake Control
Module (EBCM) on Class 2 serial data line. LED illuminates when one or more of the following
conditions exists:

• Parking brake switch is closed (TBC monitored).

• Brake pressure differential switch is closed (EBCM detects loss of hydraulic pressure).
• As a check, LED illuminates for 3 seconds after ignition is turned on.

BATTERY

LED is controlled by IPC, using information sent by VCM/PCM. LED will remain on while
ignition is turned on, engine is started and for 3 seconds after key is released to run. If generator is
charging, VCM/PCM will command LED off.

CHECK GAUGES

If coolant temperature is too high or oil pressure is too low, LED illuminates to alert driver of
condition indicated by gauges. IPC monitors signals from VCM/PCM (coolant) and oil pressure
sending unit. As a check, LED illuminates for 3 seconds after ignition is turned on.

GATE AJAR

LED is controlled by IPC. LED illuminates when IPC receives Class 2 data from TBC, indicating
tailgate is ajar.

HIGH BEAM

Lamp is controlled by IPC, using Class 2 data from TBC.

LOW FUEL

If fuel level is low, LED illuminates to alert driver of condition indicated by gauges. IPC monitors
Class 2 data from VCM/PCM. As a check, LED illuminates for 3 seconds after ignition is turned
on.

SEAT BELT

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Seat belt LED works in conjunction with a buzzer. If seat belt is not fastened when key is turned to
run, buzzer will sound for 8 seconds and LED will illuminate solid for 20 seconds and flash for 55
seconds. Buzzer will stop if belt is fastened during 8 second interval. If seat belt is fastened when
key is turned to run, no buzzer will sound and LED will illuminate solid for 75 seconds. If seat belt
is unfastened during 8 second interval, buzzer will sound for remainder of 8 second interval.

SECURITY

LED is controlled by IPC, using Class 2 data from TBC. As a check, LED illuminates for 3
seconds after ignition is turned on.

SERVICE ENGINE SOON

LED is controlled by VCM/PCM. If a problem occurs in engine control system, PCM/VCM

illuminates LED and a DTC is stored. SERVICE ENGINE SOON light may be referred to as
Malfunction Indicator Light (MIL).

SERVICE 4WD

LED is controlled by IPC. LED illuminates when IPC receives Class 2 data from Transfer Case
Control Module (TCCM).

TURN SIGNALS

Lamps are operated by turn signal switch and flasher.

UP-SHIFT (M/T)

LED illuminates to tell driver when to upshift for best fuel economy. PCM/VCM monitors engine
speed, load and throttle position for light control. PCM/VCM illuminates LED if parameters are
met.

TRIPMETER BUTTON

Pressing button on cluster resets trip mileage to zero.

SERVICE PRECAUTIONS - AIR BAG

Observe following precautions when working with vehicles equipped with Supplemental Inflatable
Restraint (SIR) system:

• Before performing any instrument panel testing, diagnosis or repair, disable SIR system by
disconnecting negative battery cable and Yellow 2-pin connector at base of steering column.
• Wait 2 minutes before making SIR repairs. SIR system retains enough voltage to deploy air
bag after power is disconnected.
• To prevent accidental air bag deployment, avoid SIR wiring harness when trouble shooting
instrument panel components. All SIR wires are color-coded Yellow.

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COMPONENT LOCATIONS
COMPONENT LOCATIONS

Component Location
Instrument Panel Fuse Block Lower Left Of Dash, Next To Kick Panel
Transmission Control Module Below Dash, On Heater
Vehicle Control Module Right Side Of Engine Compartment

TROUBLE SHOOTING
Check GAUGES (10 amp), CLUSTER (10 amp) and RADIO (10 amp) fuses in instrument panel
fuse block before testing.

COMPONENT TESTING

Tips Click a link to view tip

Tech1 Question: Intermittent Gauges and Blower

NOTE: If all components in IPC are inoperative, check IPC power and
ground circuits. If power and ground circuits are okay, replace
instrument cluster.

OIL PRESSURE GAUGE

NOTE: If gauge shows pressure before engine is started (gauge pegged

high), go to DTC B0709 under TESTING - DIAGNOSTIC.

1. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK under SYSTEM

TESTING. Go to next step.
2. Ensure oil level and pressure are okay. Disconnect fuel pump oil pressure switch. Connect a
variable 100 ohm resister between fuel pump oil pressure switch connector terminal "A" and
ground. Turn ignition on. Turn variable resistor from minimum to maximum resistance.
Gauge should read no pressure at zero ohms and maximum pressure at 88 ohms. If reading is
correct, go to next step. If reading is incorrect, go to step 4).
3. Replace fuel pump oil pressure switch. Reconnect connector. Perform INSTRUMENT
PANEL CLUSTER (IPC) SYSTEM CHECK under SYSTEM TESTING.
4. Check continuity of Tan/White wire between IPC connector terminal A2 and switch
connector terminal "A". See Fig. 2 . If continuity does not exist, go to next step. If wire is
okay, go to step 6).
5. Repair Tan/White wire between IPC connector terminal A2 and switch connector terminal
"A". Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK under
SYSTEM TESTING.

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6. Replace IPC. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK

under SYSTEM TESTING.

SYMPTOM TESTING

Tips Click a link to view tip

Tip: Faulty ignition switch causes MIL on, transmission stuck in 2nd
or 3rd gear or instrument panel

TACHOMETER DOES NOT OPERATE PROPERLY

1. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK under SYSTEM

TESTNG. Go to next step.
2. Start engine. Using scan tool, check RPM. If RPM reading agrees with actual engine speed,
go to next step. If RPM and engine speed are not the same, go to step 5).
3. Compare scan tool reading to tachometer reading. If values are within 300 RPM, system is
okay. If readings vary by more than 300 RPM, go to next step.
4. Replace IPC. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK
under SYSTEM TESTING.
5. Check for RPM input at IPC connector terminal A3 (White wire). See Fig. 2 . If RPM signal
does not exist, go to next step. If RPM signal exists, see appropriate TESTS W/CODES
article in ENGINE PERFORMANCE section:
• TESTS W/CODES - 2.2L
• TESTS W/CODES - 4.3L
6. Check connectors and wiring between IPC and VCM/PCM. Repair as necessary. If problem
was repaired, perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK
under SYSTEM TESTING. If no problem was found, see appropriate TESTS W/CODES
article in ENGINE PERFORMANCE section:
• TESTS W/CODES - 2.2L
• TESTS W/CODES - 4.3L

TEMPERATURE GAUGE DOES NOT OPERATE PROPERLY

1. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK under SYSTEM

TESTING. Go to next step.
2. Start engine. Using scan tool, check Displayed Coolant Temperature. If Displayed Coolant
Temperature reading is within 25 degrees of IPC gauge reading, go to next step. If Displayed
Coolant Temperature reading is not within 25 degrees of IPC gauge reading, go to step 6).
3. Check Monitored Coolant Temperature on scan tool. If reading is 100-260(0)F, go to next
step. If reading is not 100-260(0)F, go to step 5).
4. Check Monitored Coolant Temperature and Displayed Coolant Temperature. If readings are
within 25 degrees, go to next step. If readings are not within 25 degrees, go to step 6).
5. If Monitored Coolant Temperature is less than 100(0)F, gauge should be at or near lowest
reading. If Monitored Coolant Temperature is more than 260(0)F, gauge should be at or near

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maximum reading. If gauge is reading properly, IPC is okay. If gauge does not read
properly, go to next step.
6. Replace IPC. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK
under SYSTEM TESTING.

PRNDL INDICATOR DOES NOT OPERATE PROPERLY

1. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK under SYSTEM

TESTING. Go to next step.
2. If PRNDL displays all positions except PARK, PRNDL displays PARK only, or PRNDL
has no gear displayed, go to appropriate test under COMPONENT TESTING . If current
problem is not listed, go to next step.
3. Using scan tool, command IPC to display each gear on PRNDL display. If each gear is
displayed when commanded, go to next step. If display does not show each gear when
commanded, go to step 6).
4. Turn ignition on. Move shift lever through range while monitoring scan tool. If display
matches scan tool, go to next step. If display does not match scan tool, go to step 6).
5. If scan tool data matches gear lever position, system is okay. If scan tool data does not match
gear lever position, PCM/VCM is sending wrong information. See appropriate TESTS
W/CODES article in ENGINE PERFORMANCE section:
• TESTS W/CODES - 2.2L
• TESTS W/CODES - 4.3L

FUEL GAUGE DOES NOT OPERATE PROPERLY

1. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK under SYSTEM

TESTING. Go to next step.
2. Turn ignition on. Using scan tool, command fuel gauge OFF and ON. Gauge should be at or
near "E" when commanded OFF and at or near "F" when commanded ON. If gauge operates
as noted, go to next step. If gauge does not operate as noted, go to step 4).
3. Select fuel level display on scan tool. Compare scan tool reading to actual amount of fuel in
tank. If reading is accurate within 15 percent, system is okay. If reading does not match fuel
level, PCM/VCM is sending wrong information. See appropriate TESTS W/CODES article
in ENGINE PERFORMANCE section:
• TESTS W/CODES - 2.2L
• TESTS W/CODES - 4.3L
4. Replace IPC. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK
under SYSTEM TESTING.

VOLTMETER DOES NOT OPERATE PROPERLY

1. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK under SYSTEM

TESTING. Go to next step.
2. Turn ignition on. Check voltage at IPC connector terminal A7 (Pink wire). See Fig. 2 . If
voltage is within 2.5 volts of IPC voltmeter reading, system is okay. If voltage readings do
not match, go to next step.

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3. Replace IPC. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK

under SYSTEM TESTING.

SPEEDOMETER DOES NOT OPERATE PROPERLY

Tips Click a link to view tip

Tech1 Tip: SPEEDO INOP - WRONG RADIO!

CAUTION: On 4WD and AWD models, ensure all wheels are supported off the
ground.

1. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK under SYSTEM

TESTING. Go to next step.
2. Raise and support vehicle with wheels off the ground. Start engine and put vehicle in gear
(wheels spinning). Using scan tool, check vehicle speed. If scan tool reading and expected
vehicle speed are the same, go to next step. If scan tool reading and vehicle speed do not
match, go to step 5).
3. Compare scan tool reading and IPC speedometer reading. If readings are within 3 MPH,
system is okay. If readings do not match, go to next step.
4. Replace IPC. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK
under SYSTEM TESTING.
5. Check for speed input (3-5 volts AC (RMS scale)) at IPC connector terminal A4 (Dark
Green wire). See Fig. 2 . If input exists, PCM/VCM is sending wrong information. See
appropriate TESTS W/CODES article in ENGINE PERFORMANCE section:
• TESTS W/CODES - 2.2L
• TESTS W/CODES - 4.3L

If input does not exist, go to next step.

6. Check for open or short to battery voltage in Dark Green wire between IPC and VCM/PCM.
Check IPC and VCM/PCM connectors. Repair as necessary. If problem was repaired,
perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK under SYSTEM
TESTING. If no problem was found, See appropriate TESTS W/CODES article in ENGINE
PERFORMANCE section:
• TESTS W/CODES - 2.2L
• TESTS W/CODES - 4.3L

ODOMETER OR TRIPMETER DOES NOT ILLUMINATE WHEN TRIPMETER SWITCH

IS PRESSED WITH IGNITION IN LOCK

Check IPC power and ground supply. See IPC POWER & GROUND CHECK under
COMPONENT TESTING. Verify headlights are off to ensure dimmer switch is not affecting
intensity. If power and ground supply are okay, replace IPC.

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ODOMETER DOES NOT ACCUMULATE MILEAGE

Check IPC power and ground supply. See IPC POWER & GROUND CHECK under
COMPONENT TESTING. If power and ground supply are okay and speedometer operates
correctly, replace IPC (provided odometer has not reached 999,999).

TRIPMETER DOES NOT ACCUMULATE/RETAIN MILEAGE

NOTE: Low battery voltage may cause tripmeter to reset.

Check IPC power and ground supply. See IPC POWER & GROUND CHECK under
COMPONENT TESTING. If power and ground supply are okay, speedometer operates correctly,
and power supply has not been interrupted (resetting tripmeter), replace IPC.

PRNDL OR ODOMETER DOES NOT PERFORM 2 SECOND SEGMENT FUNCTION

CHECK OR ILLUMINATE AT ALL WHEN IGNITION IS ON.

Check IPC power and ground supply. See IPC POWER & GROUND CHECK under
COMPONENT TESTING. Verify headlights are off to ensure dimmer switch is not affecting
intensity. If power and ground supply are okay, replace IPC.

PRNDL & ODOMETER DISPLAYS DO NOT ILLUMINATE WHEN IGNITION IS ON,

UNLESS TRIPMETER SWITCH IS PRESSED.

An open or short to ground in circuit 1020 (Pink wire) will result in displays not illuminating. IPC
will not communicate with scan tool. If tripmeter switch is pressed, display will illuminate and IPC
will communicate with scan tool while switch is pressed.

Check IPC power and ground supply. See IPC POWER & GROUND CHECK under
COMPONENT TESTING. If power and ground supply are okay, replace IPC.

CANNOT TOGGLE BETWEEN ODOMETER & TRIPMETER WITH IGNITION ON

Check IPC power and ground supply. See IPC POWER & GROUND CHECK under
COMPONENT TESTING. If power and ground supply are okay, replace IPC.

IPC DOES NOT ILLUMINATE WITH PARK LIGHTS OR HEADLIGHTS

ON/ILLUMINATION DOES NOT RESPOND TO DIMMER SWITCH

Check IPC power/ground supply. See IPC POWER & GROUND CHECK under
COMPONENT TESTING. See WIRING DIAGRAMS .

NO GEAR DISPLAYED ON PRNDL

NOTE: To identify modules on serial data line, see appropriate wiring

diagram in WIRING DIAGRAMS .

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Check IPC power and ground supply. See IPC POWER & GROUND CHECK under
COMPONENT TESTING. Using scan tool, attempt to communicate with modules on serial data
line. If a problem exists, WIRING DIAGRAMS . If communication is okay, turn ignition on.
Monitor scan tool while moving gear selector through all positions. If scan tool indicates proper
position, replace IPC. If scan tool does not indicate proper gear position, VCM/PCM is not
communicating PRNDL information to IPC. See appropriate TESTS W/CODES article in
ENGINE PERFORMANCE section:

• TESTS W/CODES - 2.2L

• TESTS W/CODES - 4.3L

If IPC displays all positions except PARK or displays PARK but no other positions, see following
SYMPTOM TESTING.

PRNDL DISPLAYS ALL POSITIONS EXCEPT PARK

Perform NO GEAR DISPLAYED ON PRNDL test. If problem still exists, check continuity of
steering column switch. Do not use scan tool to confirm continuity.

PRNDL DISPLAYS PARK, BUT NO OTHER POSITIONS

Perform NO GEAR DISPLAYED ON PRNDL test. If problem still exists, check continuity of
steering column switch. Do not use scan tool to confirm continuity.

PRNDL DISPLAYS INCORRECT GEAR

Perform PRNDL INDICATOR DOES NOT OPERATE PROPERLY test under

COMPONENT TESTING.

INDICATOR DOES NOT OPERATE PROPERLY

NOTE: This test applies to all indicators listed.

Using scan tool, command indicator on and off. If indicator does not turn on and off, replace IPC.
If indicator does turn on and off, see reference listed after appropriate indicator.

• SHIFT Indicator. See the TESTS W/CODES - 2.2L article, or the TESTS W/CODES -
4.3L article in ENGINE PERFORMANCE section.
• ANTI-LOCK Indicator. See ANTI-LOCK BRAKE SYSTEM article in BRAKES section.
• TAILGATE AJAR Indicator. See WIRING DIAGRAMS .
• SERVICE 4WD Indicator. See appropriate TRANSFER CASE article IN POWERTRAIN
section.
• SEAT BELT Indicator. See WIRING DIAGRAMS .
• HIGH BEAM Indicator. See WIRING DIAGRAMS .
• SECURITY Indicator. See ANTI-THEFT SYSTEM article.
• TURN SIGNAL Indicators. See WIRING DIAGRAMS .

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• BRAKES Indicator. See ANTI-LOCK BRAKE SYSTEM article in BRAKES section, or

see BODY CONTROL MODULE article.
• LOW FUEL Indicator. See TESTS W/CODES - 2.2L article, or TESTS W/CODES - 4.3L
article in ENGINE PERFORMANCE section.
• BATTERY Indicator. See GENERATOR & REGULATOR article in ELECTRICAL
section.
• SERVICE ENGINE SOON Indicator. See TESTS W/CODES - 2.2L article, or TESTS
W/CODES - 4.3L article in ENGINE PERFORMANCE section.

SYSTEM TESTING
CAUTION: When battery is disconnected, vehicle computer and memory
systems may lose memory data. Driveability problems may exist
until computer systems have completed a relearn cycle. See
COMPUTER RELEARN PROCEDURES article in GENERAL
INFORMATION section before disconnecting battery.

CAUTION: Static electricity can destroy integrated circuits in instrument

cluster. Before servicing these components, ground yourself and
work area to discharge static electricity.

INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK

NOTE: To identify modules on serial data line, refer to WIRING DIAGRAMS .

1. Check all power and ground circuits. See IPC POWER & GROUND CHECK under
COMPONENT TESTING. Go to next step.
2. Using scan tool, attempt to communicate with modules on serial data line. If a problem
exists, see WIRING DIAGRAMS . If all modules communicate, go to next step. If a
problem exists, see WIRING DIAGRAMS .
3. Ensure vehicle is in Park. Turn ignition on. Odometer display should perform a 2 second
segment function test. The ABS, LOW FUEL, CHECK GAUGES, BRAKE and SECURITY
lights should illuminate for 3 seconds as a bulb check. PRNDL should show "P". BATTERY
light should stay on. AIR BAG light should flash 7 times. SEAT BELT light should stay on
for 20 seconds , then flash for 55 seconds. MIL should stay on. If all lights operate as
specified, go to next step. If lights do not operate as specified, complete check and go to
INDICATOR DOES NOT OPERATE PROPERLY under COMPONENT TESTING.
4. Start engine. With brakes applied, move shift lever through all positions. PRNDL should
show each position. If PRNDL operates as specified, go to next step. If PRNDL does not
operate as specified, see AUTO TRANS DIAGNOSIS article.
5. Using scan tool, check for DTCs. If no DTCs exist, check is complete. If DTCs exist, see
SELF-DIAGNOSTIC - SYSTEM .

IPC POWER & GROUND CHECK

1. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK under SYSTEM

TESTING. Go to next step.

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2. Turn ignition on. Using test light connected to ground, probe IPC connector terminal A8
(Pink wire). See Fig. 2 . If test light does not illuminate, go to next step. If test light
illuminates, go to step 4).
3. Check CLUSTER (10 amp) fuse. Replace as needed. If fuse is okay, repair open circuit in
Pink wire between fuse block and IPC connector terminal A8. Ensure power supply to IPC
connector terminal A8. Go to next step.
4. Turn ignition on. Using test light connected to ground, probe IPC connector terminal A7
(Pink wire). If test light does not illuminate, go to next step. If test light illuminates, go to
step 6).
5. Check GAUGES (10 amp) fuse. Replace as needed. If fuse is okay, repair open circuit in
Pink wire between fuse block and IPC connector terminal A7. Ensure power supply to IPC
connector terminal A7. Go to next step.
6. Using test light connected to ground, probe IPC connector terminal B2 (Gray wire). Turn
ignition on. Turn headlights on. Adjust dimmer switch to maximum intensity. If test light
does not illuminate, go to next step. If test light illuminates, go to step 8).
7. Check ILLUMINATION (10 amp) fuse. Replace as needed. If fuse is okay, repair open
circuit in Gray wire between fuse block and IPC connector terminal B2. Ensure power
supply to IPC connector terminal B2. Go to next step.
8. Using test light connected to ground, probe IPC connector terminal A10 (Orange wire). If
test light does not illuminate, go to next step. If test light illuminates, go to step 10).
9. Check RADIO/BATT (10 amp) fuse. Replace as needed. If fuse is okay, repair open circuit
in Orange wire between fuse block and IPC connector terminal A10. Ensure power supply to
IPC connector terminal A10. Go to next step.
10. Connect test light between IPC connector terminal A10 (Orange wire) and IPC connector
terminal A9 (Black/White wire). If test light does not illuminate, go to next step. If test light
illuminates, go to step 12).
11. Repair open in Black/White wire between IPC connector terminal A9 and ground. Perform
INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK under SYSTEM
TESTING.
12. Connect test light between IPC connector terminal A10 (Orange wire) and IPC connector
terminal B3 (Black wire). If test light does not illuminate, go to next step. If test light
illuminates, power and ground circuits are okay. Perform INSTRUMENT PANEL
CLUSTER (IPC) SYSTEM CHECK under SYSTEM TESTING.
13. Repair open in Black wire between IPC connector terminal B3 and ground. Perform
INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK under SYSTEM
TESTING.

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Fig. 2: Identifying IPC Connector

Courtesy of GENERAL MOTORS CORP.

SELF-DIAGNOSTIC - SYSTEM
NOTE: For wiring and connector terminal identification, see WIRING
DIAGRAMS .

NOTE: Diagnostic trouble code tests are written specifically for use with GM
Tech I or Tech II scan tools. Generic scan tool can be used but may
have limited functions.

INSTRUMENT PANEL CLUSTER (IPC) DTC

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IPC DTC Description

B0709 Oil Pressure Indicator Circuit Open
B0860 Device Ignition START Circuit Malfunction
B1367 Device Ignition 0 Circuit Low
U1016 (1) Lost Communications With Vehicle Control
Module/Powertrain Control Module
U1026 Lost Communications With Transmission Control System
U1041 (2) Lost Communications With E B Control Module
U1064 Lost Communications With Transmission Control Module
(1) Illuminates LOW FUEL and BATTERY indicators.

(2) Illuminates ABS indicator.

TESTING - DIAGNOSTIC

DTC B0709: OIL PRESSURE INPUT OPEN

Description

IPC monitors voltage on Tan/White wire to fuel pump oil pressure switch. DTC sets when open
circuit exists on Tan/White wire.

Diagnostic Aids

An open circuit will cause gauge to indicate maximum pressure. Intermittent problems may be
caused by poor connection or wiring problems.

Testing

1. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK under SYSTEM

TESTING. Go to next step.
2. Check resistance between IPC terminal A2 (Tan/White wire) and ground. See Fig. 2 . If
resistance is less than 3 ohms, go to next step. If resistance is 3 ohms or more, go to step 5).
3. Connect a fused jumper wire between IPC terminal A2 (Tan/White wire) and ground. Clear
DTC. Turn ignition on. If DTC B0709 resets, go to next step. If DTC does not reset, IPC is
okay. See Diagnostic Aids.
4. Replace IPC. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK
under SYSTEM TESTING.
5. Disconnect fuel pump oil pressure switch connector. Check continuity between switch
terminal "A" and ground. If resistance is less than 3 ohms, go to next step. If resistance is 3
ohms or more, go to step 7).
6. Repair open circuit or intermittent connection in Tan/White wire between IPC terminal A2
and fuel pump oil pressure switch terminal "A". Go to step 8).
7. Replace fuel pump oil pressure switch. Go to next step.

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8. Clear DTCs. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK

under SYSTEM TESTING.

DTC B0860: IPC CRANK SIGNAL CIRCUIT MALFUNCTION

Description

IPC monitors crank signal input circuit on Purple/White wire. DTC sets when crank signal input
circuit remains high for 60 seconds.

Diagnostic Aids

An intermittent problem may be caused by a short to voltage on circuit.

Testing

1. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK under SYSTEM

TESTING. Go to next step.
2. Turn ignition on. Check voltage by backprobing IPC terminal A2 (Tan/White wire). See Fig.
2 . If voltage is not 9-14 volts, go to next step. If voltage is 9-14 volts, go to step 6).
3. Check for intermittent short to battery voltage on Purple/White wire between IPC terminal
A5 and underhood bussed electrical center connector C1 terminal A11. If no problem was
found, go to next step. If short was found, go to step 6).
4. Clear DTC. Turn ignition off. Turn ignition on. Wait 60 seconds. If DTC B0860 resets, go to
next step. If DTC does not reset, IPC is okay. Perform INSTRUMENT PANEL
CLUSTER (IPC) SYSTEM CHECK under SYSTEM TESTING.
5. Replace IPC. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK
under SYSTEM TESTING.
6. Repair short circuit on Purple/White wire between IPC terminal A5 and underhood bussed
electrical center connector C1 terminal A11. Go to next step.
7. Clear DTCs. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK
under SYSTEM TESTING.

DTC B1367: IPC IGNITION 0 CIRCUIT LOW

Description

Ignition 0 is switched battery input. IPC checks for low Ignition 0 voltage when engine is running.
Voltage should be high when ignition is in UNLOCK, RUN or CRANK positions. If Class 2
Engine Run message exists and Ignition 0 is less than 3 volts for one second or more, DTC B1367
sets.

Diagnostic Aids

An intermittent problem may be caused by a poor connection or open circuit. If CLUSTER fuse or
wiring has been replaced or repaired recently, DTC may remain as history code.

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Testing

1. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK under SYSTEM

TESTING. Go to next step.
2. Disconnect IPC. Check for intermittent connection, open or short to ground on Pink wire
between IPC terminal A8 and instrument panel fuse block terminal L5. If problem was
found, repair Pink wire between IPC terminal A8 and instrument panel fuse block terminal
L5. Go to next step. If no problem was found, go to next step.
3. Clear DTCs. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK
under SYSTEM TESTING.

REMOVAL & INSTALLATION

CAUTION: When battery is disconnected, vehicle computer and memory
systems may lose memory data. Driveability problems may exist
until computer systems have completed a relearn cycle. See
COMPUTER RELEARN PROCEDURES article in GENERAL
INFORMATION section before disconnecting battery.

CAUTION: Static electricity can destroy integrated circuits in instrument

cluster. Before servicing these components, ground yourself and
work area to discharge static electricity.

INSTRUMENT PANEL

Removal & Installation

1. Disable air bag system. See AIR BAG RESTRAINT SYSTEM article in ACCESSORIES
AND ELECTRICAL. Disconnect negative battery cable. Drain engine coolant. Remove
heater hoses at core and plug core openings.
2. Remove right underdash hush panel. Remove screws for instrument panel glove box door,
glove box and bezel. Disconnect electrical connector for glove box light and switch
assembly. Remove door, compartment and bezel from instrument panel. Remove lower right
instrument panel mounting bolt.
3. Remove center underdash hush panel. Remove left and right speaker grilles and speakers.
Gently pry off defrost grille located on top of instrument panel.
4. Remove left underdash hush panel. Remove 4 screws attaching knee bolster below steering
column. Set parking brake. Disconnect emergency brake release cable from ratchet
mechanism. Move tilt steering column down (if equipped). Turn ignition key to ON position
and move automatic transmission gear selector to low (if equipped). Remove instrument
panel accessory trim plate. See Fig. 3 . Remove instrument cluster.
5. Remove connectors from Body Control Module (BCM). BCM is located on heater case in
center of dash. Bend snap retainers away from BCM bracket to remove. See Fig. 4 .
Disconnect connectors on back of A/C-heater control panel and radio. Remove A/C-heater
control panel and radio.
6. Remove 4 steering column retaining bolts and lower steering column. Remove instrument
panel support screws and bolts. Roll instrument panel toward rear of vehicle. Disconnect

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necessary electrical connectors. Remove instrument panel. See Fig. 3 .. To install, reverse
removal procedure.

Fig. 3: Exploded View Of Instrument Panel & Accessory Trim Plate

Courtesy of GENERAL MOTORS CORP.

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Fig. 4: Body Control Module Mounting

Courtesy of GENERAL MOTORS CORP.

INSTRUMENT PANEL CLUSTER

Removal & Installation

Disconnect negative battery cable. Disable SIR system. See SERVICE PRECAUTIONS - AIR
BAG . Remove sound insulation. Remove steering column cover nuts. Remove steering column
cover. Remove instrument cluster bezel. Remove 4 cluster-to-instrument panel screws. Disconnect
electrical connector. Remove cluster. See Fig. 5 . To install, reverse removal procedure.

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Fig. 5: Exploded View Of Instrument Cluster

Courtesy of GENERAL MOTORS CORP.

WIRING DIAGRAMS

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Fig. 6: Analog Instrument Panel Wiring Diagram (1 Of 2)

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Fig. 7: Analog Instrument Panel Wiring Diagram (2 Of 2)

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Fig. 8: Data Link Connector Wiring Diagram

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Fig. 9: Exterior Lights Wiring Diagram (Blazer, Bravada Envoy & Jimmy)

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Fig. 10: Exterior Lights Wiring Diagram (S10 & Sonoma)

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Fig. 11: Headlight System Wiring Diagram

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Fig. 12: Illumination/Interior Lights Wiring Diagram (Blazer, Bravada, Envoy & Jimmy - 1
Of 3)

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Fig. 13: Illumination/Interior Lights Wiring Diagram (Blazer, Bravada, Envoy & Jimmy - 2
Of 3)

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Fig. 14: Illumination/Interior Lights Wiring Diagram (Blazer, Bravada, Envoy & Jimmy - 3
Of 3)

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Fig. 15: Illumination/Interior Lights Wiring Diagram (S10 & Sonoma - 1 Of 2)

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Fig. 16: Illumination/Interior Lights Wiring Diagram (S10 & Sonoma - 2 Of 2)

© 2008 Mitchell Repair Information Co., LLC.

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