SAM Chassis G02.

05
Table of Contents

System Overview
Terms and Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501
Fuses and Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 502
Datalink Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 503
Diagnostic CAN Datalink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 504
Functional Messaging and ECU Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 505
ECU Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 506
Datalink Network Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 507
Components
Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....... 600
Component Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....... 601
Pinout Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....... 602
Fuse Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....... 603
Relay Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....... 604
Troubleshooting
Troubleshooting Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700
Required Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 701
Possible Causes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 702
Fault Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 703
Fused and Relayed Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 704
Unfused Outputs, Grounded Pins, and Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 705
Logic Controlled Unfused Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 706
Logic Controlled Relayed Fused Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 707
Unfused Constant Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 708
Fused Battery Pass-Through Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 709
Specifications
Maximum Current Pin List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800

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500 — Terms and Abbreviations

Baud rate—The rate at which data is transmitted in bits per second.
Cabin CAN—A proprietary datalink connecting certain ECUs on the vehicle, specifically the CGW, MSF, SAM
Cab, and SAM Chassis.
CAN—Controller Area Network
CAN ID—The identifier for a specific message, which also contains the source address of the sending ECU
communicating on the J1939 datalink.
CGW—Central Gateway
Communication Protocol—A set of rules governing communication between electronic devices.
Datalink—A collection of wires, connecting system components, through which data is transmitted.
Datalink Topology—The arrangement in which the nodes (ECUs) of a datalink are connected to each other.
Diagnostic CAN—Datalink that runs from the diagnostic connector to the CGW.
Diagnostic Connector—A 9-pin diagnostic connector is used for troubleshooting the electrical system.
EAPU—Electric Air Processing Unit
FMI—Failure Mode Indicator. The part of a J1587, J1939, and CAN fault code that identifies how part of a de-
vice, or item on a device, failed.
I/O Controls—Input/Output controls allow a technician to activate and deactivate an input or output pin for trou-
bleshooting purposes. I/O controls appear on ServiceLink templates as buttons, typically labeled "ON" and
"OFF."
MSF—Modular Switch Field
NO—Normally Open
NC—Normally Closed
Off-board tool—Typically refers to a PC-based application that communicates with the vehicle datalinks via a
connection to the diagnostic connector.
Parameter—A parameter is a specific value that is assigned to a feature or function of the vehicle, and allows
the customer to choose how that particular feature or function will work on the vehicle.
PDM—Power Distribution Module
SA—Source Address; indicates numeric assignment for a device that communicates on J1939.
SAM Cab—Signal Detect and Actuation Module Cab ("SAM Cabin"); this ECU controls mainly cab-related func-
tionality. See G02.04 — SAM Cab for more information.
SAM Chassis—Signal Detect and Actuation Module Chassis; this ECU controls mainly chassis-related function-
ality.
SPN—Suspect Parameter Number. The part of a J1939 or CAN fault code that identifies how part of a device, or
item on a device, failed.
WIF—Water In Fuel

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501 — General Information

The SAM Chassis is an ECU (Electronic Control Unit). "SAM" stands for "Signal Detect and Actuation Module."
The SAM Chassis works closely with the SAM Cab to control much of the vehicle functionality. The SAM Chas-
sis controls most of the chassis functions, and the SAM Cab controls most of the cab functions.
This ECU uses inputs (such as switches, sensors, and datalink messages), and drives many outputs (such as
lights, motors, and solenoids). See 601 — Component Details for complete pin information.
To understand a particular function or system that the SAM Chassis controls, see the applicable subject in this
manual. These subjects contain details about the way the function should work, as well as crucial information
such as inputs, outputs, interlocks, any related parameters for that particular function, and any other ECUs or
components that are a part of that function.

502 — Fuses and Relays

See 601 — Component Details for fuse and relay information.
For more information on the power distribution system, see G02.01 — Electrical System and Main PDM
Overview.

503 — Datalink Connections

The SAM Chassis is connected directly to the Cabin CAN datalink. Cabin CAN wires run from the SAM Chassis
to the starpoint connector, where it joins the rest of the Cabin CAN datalink.
See G03.03 — Datalink, Cabin CAN for details.

504 — Diagnostic CAN Datalink

When an off-board tool, such as ServiceLink or DiagnosticLink, is connected to the vehicle, it communicates with
the Cabin CAN ECUs via the Diagnostics CAN datalink; there is no accessible service port to the Cabin CAN.
The CGW translates between the Diagnostics CAN and Cabin CAN datalink, due to the different speed and
message formats of the two datalinks.

505 — Functional Messaging and ECU Troubleshooting

To communicate with the ECU, a different set of messages is used by the off-board tool during troubleshooting
than the set of messages used during normal operation.
The set of messages used during normal operation is referred to as functional messages, which are sent cycli-
cally on the Cabin CAN datalink. However, the set of messages (protocol) used during troubleshooting is referred
to as Control Area Network (CAN), which operates on a request-and-response basis over the Diagnostic CAN
datalink.
Any fault reported on the Cabin CAN is translated to Diagnostics CAN by the CGW, and can be displayed when
requested by an off-board tool, such as ServiceLink or DiagnosticLink. Similarly, an off-board tool is able to dis-
play input and output pin status information, software interlocks, and allows a user to control inputs or outputs for
troubleshooting. This information is displayed in ServiceLink’s Datalink Monitor (DLM) templates.

506 — ECU Configuration

The diagnostic protocol used for troubleshooting or configuring the SAM Chassis is the Control Area Network
(CAN). For more information on CAN, see G03.04 — Datalink, Diagnostic CAN.

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The SAM Chassis has parameters that can be viewed or changed for vehicle configuration.
The SAM Chassis software can be programmed using ServiceLink or DiagnosticLink, which will update to its
same version or upgrade, if required.
The software flashing procedure should only be performed on the SAM Chassis in the following cases:
• As a last resort: Troubleshooting has narrowed the problem down to being at the SAM Chassis itself and
no other mechanical or electrical causes for the symptom have been identified. As a last resort, flashing
the SAM Chassis software with the same version may help in the case it became corrupt during the
course of normal vehicle operation.
• For a feature upgrade: Adding a new feature to a vehicle may require a newer version of ECU software.
ServiceLink or DiagnosticLink will automatically make available any necessary software upgrades.
• Fixing a problem in the existing software: In case a new version of ECU software is needed to fix a
problem in the existing ECU software, ServiceLink or DiagnosticLink will automatically make available any
necessary software upgrades.
• Replacing the SAM Chassis: Flashing ensures that the most recent software is on the installed ECU.
For instructions on how to use ServiceLink to flash the software of a CAN ECU like the SAM Chassis, refer to
the ServiceLink User Guide or ServiceLink Help user documentation, available in ServiceLink’s "Help" menu.

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507 — Datalink Network Topology

Cascadia Network Topology

Diagnostic CAN
Central Gateway
(500kbps) SAE J1939−13
SAE J1708
9−Pin connector
(9.6kbps)

SAM Cab
Cabin CAN SAE J1939
(125kbps) (250kbps) Engine Control
Module

SAM Chassis

Pneumatic ABS
Module

Modular Switch
Field (Master)
Transmission
Control Module
Sub Bus

Slave Switch Steering Wheel

Instrument
Control Panels Switches
Cluster

HVAC Control
Stalk Switch Switches Front
Head Lamp
(Steering
Switch
Column)

HVAC Control
Switches Rear

Standard
Radio
Optional

VORAD

Engine Display

Qualcomm

07/02/2007 f040753

Fig. 1, Datalink Network Topology

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600 — Component Locations

2 3

6
07/18/2007 f544916

1. SAM Cab 3. Central Gateway 5. Diagnostic Connector

2. Starpoint Connector 4. Modular Switch Field 6. SAM Chassis

Fig. 2, Component Locations

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601 — Component Details

01/25/2007 f544954

Fig. 3, View of the SAM Chassis on the Frontwall

D
E
C
F A B
J
G
H

05/01/2006 f151036b

Fig. 4, Diagnostic Connector

Diagnostic Connector
Pin Function
A Battery (–)
B Battery (+)
C J1939 CAN High (+)
D J1939 CAN Low (–)
E CAN Shield (ground)
F J1708/J1587 (+)
G J1708/J1587 (–)
H Diagnostic CAN High (+)
J Diagnostic CAN Low (–)
Table 1, Diagnostic Connector

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602 — Pinout Mapping

NOTE: The housing of the SAM Cab contains raised lettering, labeling all connectors, fuses, and re-
lays.
The SAM Chassis is available in different hardware models: Highline, Midline, and Baseline. Table 2 describes
any differences in pin functionality between these hardware models

Pinout Mapping
Function
Connector Cavity Number
Highline Baseline Midline
SAM Chassis, Cabin CAN SAM Chassis, Cabin CAN SAM Chassis, Cabin CAN
X51 1
Low (-) Low (-) Low (-)
SAM Chassis, Cabin CAN SAM Chassis, Cabin CAN SAM Chassis, Cabin CAN
X51 2
High (+) High (+) High (+)
Hardwired ISS (Ignition Hardwired ISS (Ignition Hardwired ISS (Ignition
X51 3 Switch Status), SAM Switch Status), SAM Switch Status), SAM
Chassis Chassis Chassis
X51 4 Not connected Not connected Not connected
Emergency Battery, SAM Emergency Battery, SAM Emergency Battery, SAM
X51 5
Chassis Chassis Chassis
X51 6 Not connected Not connected Not connected
X52 1 Marker Lamp, Side Right Marker Lamp, Side Right Marker Lamp, Side Right
Marker Lamp, Side Right, Marker Lamp, Side Right, Marker Lamp, Side Right,
X52 2
Ground Ground Ground
Marker Lamp, Corner Rear Marker Lamp, Corner Rear Marker Lamp, Corner Rear
X52 3
Right Right Right
Power Feed 2, ABS/BS, Power Feed 2, ABS/BS, Power Feed 2, ABS/BS,
X52 4
Battery Battery Battery
Marker Lamp, Corner Rear Marker Lamp, Corner Rear Marker Lamp, Corner Rear
X52 5
Right, Ground Right, Ground Right, Ground
Power Feed, ABS/BS, Power Feed, ABS/BS, Power Feed, ABS/BS,
X52 6
Ignition Ignition Ignition
Power Feed 1, ABS/BS, Power Feed 1, ABS/BS, Power Feed 1, ABS/BS,
X52 7
Battery Battery Battery
Power Feed 1, ABS/BS, Power Feed 1, ABS/BS, Power Feed 1, ABS/BS,
X52 8
Ground Ground Ground
Power Feed 2, ABS/BS, Power Feed 2, ABS/BS, Power Feed 2, ABS/BS,
X52 9
Ground Ground Ground
X53 1 Marker Lamp, Side Left Marker Lamp, Side Left Marker Lamp, Side Left
Marker Lamp, Corner Rear Marker Lamp, Corner Rear Marker Lamp, Corner Rear
X53 2
Left Left Left
X53 3 Rear View Camera, Ignition Not connected Rear View Camera, Ignition
Marker Lamp, Corner Rear Marker Lamp, Corner Rear Marker Lamp, Corner Rear
X53 4
Left, Ground Left, Ground Left, Ground
Trailer ABS Connector (7), Trailer ABS Connector (7), Trailer ABS Connector (7),
X53 5
ABS Detection ABS Detection ABS Detection
X53 6 Rear View Camera, Ground Not connected Rear View Camera, Ground

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Pinout Mapping
Function
Connector Cavity Number
Highline Baseline Midline
X53 7 Trailer Turn Lamp Right Trailer Turn Lamp Right Trailer Turn Lamp Right
Marker Lamp, Side Left, Marker Lamp, Side Left, Marker Lamp, Side Left,
X53 8
Ground Ground Ground
X53 9 Trailer Turn Lamp Left Trailer Turn Lamp Left Trailer Turn Lamp Left
Trailer ABS Connector (7), Trailer ABS Connector (7), Trailer ABS Connector (7),
X54 1
Ignition Ignition Ignition
X54 2 Not connected Not connected Not connected
Trailer ABS Connector (7), Trailer ABS Connector (7), Trailer ABS Connector (7),
X54 3
Ground 1 (GND1) Ground 1 (GND1) Ground 1 (GND1)
X54 4 Not connected Not connected Not connected
Trailer Power, Battery or Trailer Power, Battery or Trailer Power, Battery or
X55 1
Ignition Ignition Ignition
X55 2 Trailer Marker Lamps Trailer Marker Lamps Trailer Marker Lamps
X55 3 Trailer Tail Lamps Trailer Tail Lamps Trailer Tail Lamps
X55 4 Trailer Stop Lamps Trailer Stop Lamps Trailer Stop Lamps
X56 1 Trailer, Ground 2 (GND2) Not connected Not connected
End-of-Frame Primary
X56 2 Not connected Not connected
Trailer Power
X56 3 Not connected Not connected Not connected
Differential Lock Solenoid
X56 4 Not connected Not connected
Return, FA1 and FA2
Differential Lock Feedback
X56 5 Not connected Not connected
Switch Return, FA1
Differential Lock Feedback
X56 6 Not connected Not connected
Switch Return, FA2
End-of-Frame Primary
X56 7 Not connected Not connected
Trailer Turn Lamps Right
Differential Lock Feedback
X56 8 Switch Supply (Chopped), Not connected Not connected
FA2
X56 9 Not connected Not connected Not connected
End-of-Frame Primary
X56 10 Not connected Not connected
Trailer Turn Lamps Left
Differential Lock Feedback
X56 11 Switch Supply (Chopped), Not connected Not connected
FA1
Differential Lock Solenoid
X56 12 Not connected Not connected
Driver, FA1 and FA2
End-of-Frame Primary
X56 13 Not connected Not connected
Trailer Tail Lamps
End-of-Frame Primary
X56 14 Not connected Not connected
Trailer Stop Lamps

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Pinout Mapping
Function
Connector Cavity Number
Highline Baseline Midline
End-of-Frame Primary
X56 15 Not connected Not connected
Trailer Marker Lamps
Power Feed EAPU / WIF Power Feed EAPU / WIF
X57 1 Not connected
Module, Ignition Module, Ignition
Power Feed EAPU (Air Power Feed EAPU (Air
X57 2 Not connected
Processing Unit), Ground Processing Unit), Ground
Air Dryer (Pneumatic, Air Dryer (Pneumatic, Air Dryer (Pneumatic,
X57 3 Electrically Heated), Electrically Heated), Electrically Heated),
Ground Ground Ground
Air Dryer (Pneumatic, Air Dryer (Pneumatic, Air Dryer (Pneumatic,
X57 4 Electrically Heated), Electrically Heated), Electrically Heated),
Accessory Accessory Accessory
Fuel Water Separator Fuel Water Separator Fuel Water Separator
X57 5
Heater Element, Ground Heater Element, Ground Heater Element, Ground
X57 6 Not connected Not connected Not connected
X57 7 Not connected Not connected Not connected
X57 8 Not connected Not connected Not connected
X57 9 Not connected Not connected Not connected
X57 10 Not connected Not connected Not connected
X57 11 Not connected Not connected Not connected
X57 12 Not connected Not connected Not connected
Power Feed EAPU (Air Power Feed EAPU (Air
X57 13 Not connected
Processing Unit), Battery Processing Unit), Battery
X57 14 Not connected Not connected Not connected
Fuel Water Separator Fuel Water Separator Fuel Water Separator
X57 15
Heater Element, Ignition Heater Element, Ignition Heater Element, Ignition
X58 1 Turn Right Rear Lower Turn Right Rear Lower Turn Right Rear Lower
X58 2 Not connected Not connected Not connected
X58 3 Tail Lamp Right Tail Lamp Right Tail Lamp Right
Marker Lamp, Side Left, Marker Lamp, Side Left, Marker Lamp, Side Left,
X58 4
Ground Ground Ground
X58 5 Tail Lamps Right, Ground Tail Lamps Right, Ground Tail Lamps Right, Ground
X58 6 Not connected Not connected Not connected
Fuel Level Sensor, Fuel Level Sensor, Fuel Level Sensor,
X58 7
Feedback Feedback Feedback
X58 8 Tail Lamps Left, Ground Tail Lamps Left, Ground Tail Lamps Left, Ground
X58 9 Not connected Not connected Not connected
X58 10 Turn Left Rear Lower Turn Left Rear Lower Turn Left Rear Lower
X58 11 Not connected Not connected Not connected
X58 12 License Plate Lamp (First) License Plate Lamp (First) License Plate Lamp (First)

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Pinout Mapping
Function
Connector Cavity Number
Highline Baseline Midline
X58 13 Marker Lamp Side Right Marker Lamp Side Right Marker Lamp Side Right
Marker Lamp Side Right, Marker Lamp Side Right, Marker Lamp Side Right,
X58 14
Ground Ground Ground
X58 15 Fuel Level Sensor, Ground Fuel Level Sensor, Ground Fuel Level Sensor, Ground
X58 16 Marker Lamp, Side Left Marker Lamp, Side Left Marker Lamp, Side Left
X58 17 Not connected Not connected Not connected
X58 18 Tail Lamp Left Tail Lamp Left Tail Lamp Left
X58 19 Backup Lamp 1 Backup Lamp 1 Backup Lamp 1
Stop Lamp, Rear Right Stop Lamp, Rear Right Stop Lamp, Rear Right
X58 20
Lower Lower Lower
X58 21 Stop Lamp, Rear Left Lower Stop Lamp, Rear Left Lower Stop Lamp, Rear Left Lower
X59 1 Backup Switch, Supply Backup Switch, Supply Backup Switch, Supply
Transmission Neutral Transmission Neutral Transmission Neutral
X59 2
Switch, Supply Switch, Supply Switch, Supply
X59 3 Backup Switch, Return Backup Switch, Return Backup Switch, Return
X59 4 Not connected Not connected Not connected
X59 5 Not connected Not connected Not connected
X59 6 Not connected Not connected Not connected
X59 7 Not connected Not connected Not connected
X59 8 Not connected Not connected Not connected
Fuel Water Separator Fuel Water Separator
X59 9 Not connected
Sensor, Feedback Sensor, Feedback
Temperature Sensor Rear Temperature Sensor Rear Temperature Sensor Rear
X59 10
Axle 1, Feedback Axle 1, Feedback Axle 1, Feedback
Differential Lock Solenoid Differential Lock Solenoid Differential Lock Solenoid
X59 11
Driver, RA1 and RA2 Driver, RA1 and RA2 Driver, RA1 and RA2
X59 12 Not connected Not connected Not connected
Temperature Sensor Rear Temperature Sensor Rear Temperature Sensor Rear
X59 13
Axle 2, Feedback Axle 2, Feedback Axle 2, Feedback
Temperature Sensor Rear Temperature Sensor Rear Temperature Sensor Rear
X59 14
Axle 2, Ground Axle 2, Ground Axle 2, Ground
Differential Lock Feedback Differential Lock Feedback Differential Lock Feedback
X59 15
Switch Return, RA1 Switch Return, RA1 Switch Return, RA1
Differential Lock Solenoid Differential Lock Solenoid Differential Lock Solenoid
X59 16
Return, RA1 and RA2 Return, RA1 and RA2 Return, RA1 and RA2
Temperature Sensor Rear Temperature Sensor Rear Temperature Sensor Rear
X59 17
Axle 1, Ground Axle 1, Ground Axle 1, Ground
Transmission Neutral Transmission Neutral Transmission Neutral
X59 18
Switch, Return Switch, Return Switch, Return

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Pinout Mapping
Function
Connector Cavity Number
Highline Baseline Midline
Differential Lock Feedback Differential Lock Feedback Differential Lock Feedback
X59 19 Switch Supply (Chopped), Switch Supply (Chopped), Switch Supply (Chopped),
RA1 RA1 RA1
Differential Lock Feedback Differential Lock Feedback Differential Lock Feedback
X59 20 Switch Supply (Chopped), Switch Supply (Chopped), Switch Supply (Chopped),
RA2 RA2 RA2
Differential Lock Feedback Differential Lock Feedback Differential Lock Feedback
X59 21
Switch Return, RA2 Switch Return, RA2 Switch Return, RA2
Table 2, Pinout Mapping

603 — Fuse Mapping

Fuse Mapping
Fuse Fuse Name Rating Connection Pin Function
F1 EAPU 20 X57 13 Power Feed Air Processing Unit, BAT
F2 H2O SEP HEAT 20 X57 15 Fuel Water Heater, IGN
F3 ABS-BAT1 20 X52 7 Power Feed 1 ABS, BAT
F4 ABS-BAT2 10 X52 4 Power Feed 2 ABS, BAT
F5 TRLR TRN L 20 X53 9 Trailer Turn Lamp Left
F6 ABS-IGN 15 X52 6 Power Feed ABS, IGN
X53 3 Rear View Camera
F7 WIF/CAMERA 10
X57 1 Power Feed EAPU, IGN
F8 TRLR TRN R 20 X53 7 Trailer Turn Lamp Right
F9 TRLR MKR 30 X55 2 Trailer Marker Lamps
F10 SAM RELAY COILS 5 N/A N/A Battery Feed for Relay Coils
F11 TRLR ABS-IGN 30 X54 1 Trailer ABS, IGN
F12 TRLR STOP 30 X55 4 Trailer Stop Lamps
F13 TRLR TAIL 20 X55 3 Trailer Tail Lamps
F14 TRLR PWR 30 X55 1 Trailer Power, BAT or IGN
Table 3, Fuse Mapping

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604 — Relay Mapping

Relay Mapping
Relay Coil Relay
(low current side) (high current side)
Relay Relay Name Conn. Pin Circuits Supplied
Control (-) Control (+) Common Suppl.
Type
(86) (85) (30) Pwr To
H2O SEP HEAT, F10 (batt
R1 SAM Micro Batt NO F2 X57 15 Fuel Water Heater, IGN
IGN power)
F10 (batt
R2 TRLR TRN L SAM Micro Batt NO F5 X53 9 Trailer Turn Lamp Left
power)
F6 X52 6 Power Feed ABS, IGN
ABS/WIF/ F10 (batt
R3 SAM Micro Batt NO X53 3 Rear View Camera
CAMERA, IGN power) F7
X57 1 Power Feed EAPU, IGN
F10 (batt
R4 TRLR TRN R SAM Micro Batt NO F8 C53 7 Trailer Turn Lamp Right
power)
F10 (batt
R5 TRLR MARKER SAM Micro Batt NO F9 X55 2 Trailer Marker Lamps
power)
F10 (batt
R6 TRLR ABS-IGN SAM Micro Batt NO F11 X54 1 Trailer ABS, IGN
power)
TRLR STOP F10 (batt
R7 SAM Micro Batt NO F12 X55 4 Trailer Stop Lamps
LAMPS power)
F10 (batt
R8 TRLR POWER SAM Micro Batt NO* F14 X55 3 Trailer Power, BAT or IGN
power)
TRLR TAIL F10 (batt
R9 SAM Micro Batt NO F13 X55 1 Trailer Tail Lamps
LAMPS power)
* R8 is a single throw relay, it will only have 4 prongs. Either pin 87 or pin 87a will be missing, depending on the intended functionality of the circuit. If prong 87a
is missing the circuit will be normally open, the trailer power circuit is enabled only if the key is in IGN position or enabled through a switch (depending on SAM
parameterization). If prong 87 is missing, the circuit is normally closed (BAT). If a 5 prong relay is used, the trailer power will be always on.
Table 4, Relay Mapping

700 — Troubleshooting Overview

If the symptom is function- or system-specific (stop lights do not function, for example), refer to the applicable
subject in this manual.
In ServiceLink or DiagnosticLink, use the CAN protocol to troubleshoot or configure the SAM Chassis, via the Di-
agnostic CAN datalink. See 601 — Component Details for the Diagnostic CAN pins in the diagnostic connector.
For more information on the Diagnostic CAN datalink, see G03.04 — Datalink, Diagnostic CAN.

WARNING
Do not leave the SAM Chassis connected to battery power if the SAM Chassis needs to be repaired or
replaced. If the SAM Chassis needs to be repaired or replaced, immediately disconnect it from battery
power until the repair is completed or the SAM Chassis is replaced. Failure to do so could result in fire,
bodily injury, or death.

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SAM Chassis G02.05

701 — Required Tools

• ServiceLink
• DiagnosticLink

702 — Possible Causes

• Wiring (bad/loose connection, corrosion, miswiring, etc.)
• SAM Chassis relays
• SAM Chassis fuses
• SAM Chassis parameters
• SAM Chassis ECU software
• Cabin CAN datalink
• Other ECUs on the Cabin CAN datalink
• Diagnostic CAN datalink

703 — Fault Codes

CAN Fault, SAM Chassis
SA SPN FMI Fault Description Fault Trigger
Trigger: SAM Chassis battery voltage sensed to
be above normal, or shorted to high. Reflects
battery voltage datalink value from the SAM Cab
Electrical Potential (Voltage) – voltage
71 168 3 ECU.
above normal, or shorted to high
Action: Check power feed wiring to the SAM Cab
and the SAM Chassis. Check alternator charging
wiring.
Trigger: SAM Chassis battery voltage sensed to
be below normal, or shorted to low. Reflects
battery voltage datalink value from the SAM Cab
Electrical Potential (Voltage) – voltage
71 168 4 ECU.
below normal, or shorted to low
Action: Check power feed wiring to the SAM Cab
and the SAM Chassis. Check alternator charging
wiring.
Trigger: The Cabin CAN Low (–) pin is shorted to
battery, or high source.
Vehicle Behavior: In the case of a serious error
with the Cabin CAN datalink, SAM Cab and SAM
CAN low – voltage above normal, or Chassis outputs may be behaving according to
71 520201 3
shorted to high source Emergency Power Mode.
Action: Check the Cabin CAN harness,
especially in connection to the SAM Chassis.
Verify proper connection of the Cabin CAN
harness to the SAM Chassis.

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G02.05 SAM Chassis

CAN Fault, SAM Chassis

SA SPN FMI Fault Description Fault Trigger
Trigger: The Cabin CAN Low (–) pin shorted to
ground, or low source.
Vehicle Behavior: In case of a serious error with
the Cabin CAN datalink, SAM Cab, and SAM
CAN low – voltage below normal, or Chassis outputs may be behaving according to
71 520201 4
shorted to low source Emergency Power Mode.
Action: Check the Cabin CAN harness,
especially in connection to the SAM Chassis.
Verify proper connection of the Cabin CAN
harness to the SAM Chassis.
Trigger: The Cabin CAN High (+) pin shorted to
battery, or high source.
In the case of a serious error with the Cabin CAN
datalink, SAM Cab and SAM Chassis outputs
CAN high – voltage above normal, or may be behaving according to Emergency Power
71 520202 4
shorted to high source Mode.
Action: Check the Cabin CAN harness,
especially in connection to the SAM Chassis.
Verify proper connection of the Cabin CAN
harness to the SAM Chassis.
Trigger: The wiring harness to the connected
load is shorted to ground, the fuse is blown, or or
Power feed ABS/BS, IGN – Voltage below
71 520306 4 the relay is stuck.
normal, or shorted to low source
Action: Check the wiring harness to the
connected load. Also check the fuse and the relay.
Trigger: A problem is detected with Cabin CAN
performance. In the case of a serious problem
Cabin CAN bus performance condition with the Cabin CAN datalink, the SAM Cab and/or
71 523511 31
exists SAM Chassis may be running in Emergency
Power Mode.
Action: Check Cabin CAN wiring.
Trigger: The SAM Chassis did not receive
heartbeat messages from the SAM Cab.
Vehicle Behavior: SAM Cab and SAM Chassis
outputs may be behaving according to
Emergency Power Mode for a SAM Cab failure.
71 524033 31 Lost communication with the SAM Cab An indication of a SAM Cab failure is that all
gauges in the instrumentation control unit (ICU)
drop to zero because power to the ICU is lost.
Action: Check Cabin CAN wiring, especially
connections to the SAM Cab and SAM Chassis.
Check SAM Cab power supply cables.

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SAM Chassis G02.05

CAN Fault, SAM Chassis

SA SPN FMI Fault Description Fault Trigger
Trigger: The SAM Chassis did not receive
heartbeat messages from the CGW.
71 524037 31 Lost communication with the CGW Action: Check Cabin CAN wiring, especially
connections to the CGW and the SAM Chassis.
Check CGW power supply fuse and wiring.
Trigger: The SAM Chassis did not receive
heartbeat messages from the MSF.
Vehicle Behavior: Headlights automatically turn
on for safety. All functions where input switches
71 524049 31 Lost communication with the MSF are controlled by the MSF do not function, such
as turn and hazard functions, rotary switch
(headlamp) functions, and wiper.
Action: Check Cabin CAN wiring, especially
connections to the MSF and the SAM Chassis.
Table 5, CAN Fault, SAM Chassis

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G02.05 SAM Chassis

704 — Fused and Relayed Outputs

LOGIC CONTROLLED RELAYED, FUSED OUTPUTS

X55/1 Trailer Power, BAT or IGN

X57/15 Fuel Water Heater, IGN*

X57/1 Power Feed EAPU, IGN

X53/7 Trailer Turn Lamp Right

X52/6 Power Feed ABS, IGN
X53/9 Trailer Turn Lamp Left

X55/2 Trailer Marker Lamps

X53/3 Rear View Camera

X55/4 Trailer Stop Lamps

X55/3 Trailer Tail Lamps

X54/1 Trailer ABS, IGN
F11 (30A)

F12 (30A)

F14 (30A)

F13 (20A)
F2 (20A)

F5 (20A)

F6 (15A)

F7 (10A)

F8 (20A)

F9 (30A)
F10 (5A)

85 85 85 85 85 85 85 85
87a 87a 87a 87a 87 87 87 87a 87
87 87 87 87 87a 87a 87a
See
Note: R8
30 86 30 86 30 86 30 86 30 86
30 30 86 30 86
86

R1 R2 R3 R4 R5 R6 R7 R8 R 9
Note: R8

12V From
Megafuse
INTERNAL SAM PC BOARD
GND To
Battery
F1 (20A)

F3 (20A)

F4 (10A)

Normally Closed Normally Open

To F 13 (BAT power) To F 13 (IGN or
NOTE R8: Switch power) NOTE R9:
Power Feed Air Processing Unit, BAT −X57/13

Power Feed 1 ABS, BAT − X52/7

Power Feed 2 ABS, BAT −X52/4

R8 is a single throw relay, it will 85 85 The SAM switches relay 9 on

only have 4 prongs. Either pin 87a 87 supplying power to fuse 13
87 or pin 87a will be missing, when the headlight switch is
depending on the intended on! thus turning on the trailer
functionality of the circuit. tail lamps.
If prong 87a is missing the 30 86 30 86
circuit will be normally open, the When in emergency power
BAT

BAT

trailer power circuit is enabled mode, the SAM switches relay 9

only if the key is in IGN position on and off, which switches the
or enabled through a switch power to fuse 13 on and off!
(depending on SAM thus flashing the trailer tail
parameterization) 87 87 lamps.
If prong 87 is missing, the circuit
is normally closed (BAT). 87a 87a
If a 5 prong relay is used, the 86 85 86 85

trailer power will be always on. 30 30

NC Relay −Pin 87 NO Relay −Pin 87a

missing missing
FUSED BATTERY
PASSTHROUGHS
* When specified with Optimized Idle, these pins will not supply power when the key is in the ACC position,
nor during an Optimized Idle vehicle shutdown event. Optimized Idle is specified by a SAM Cab parameter.
02/25/2010 Ref. Dia. SAM CHAS_Relay_Fuse_small.vsd f545101

Fig. 5, Fused and Relayed Outputs

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 02/25/2010
Battery
GND To
Megafuse
12V From
SAM Chassis

X52/2 −Marker Lamps, Side Right GND

Emergency BAT, Chas ! X51/5

Cascadia Troubleshooting Manual, March 2016

X52/5 −Marker Lamps, Corner Rear Right GND
X52/8 −Power Feed 1 ABS/BS, GND
*Air dryer (pneumatic, electrically heated), ACC ! X57/4 X52/9 −Power Feed 2 ABS/BS, GND

Spare IGN ! X58/2 X53/4 −Marker Lamps, Corner Rear Left GND
X53/6 −Rear View Camera GND
X53/8 −Marker Lamps, side left GND

OUTPUTS
UNFUSED
CONSTANT
X54/3 −Trailer ABS Connector (7), GND1

X56/1 −Trailer GND2

Marker Lamp, side right ! X52/1
Marker lamp, Corner Rear Right ! X52/3 X57/2 −Power feed EAPU (Air Processing Unit), GND
X57/3 −Air Dryer (Pneumatic, Electrically Heated), GND
Marker Lamp, Side Left ! X53/1 X57/5 −Fuel Water Separator Heater Element GND
Marker Lamp, Corner Rear Left ! X53/2
X58/4 −Marker Lamps, Side Left GND
End of Frame Primary Trailer Power ! X56/2 X58/5 −Tail Lamps, Right GND
GROUNDED PINS

End of Frame Primary Trailer Turn Lamps Right ! X56/7 X58/8 −Tail Lamps, Left, GND
Diff Lock Feedback Switch Supply (Chopped), FA2 ! X56/8 X58/14 −Marker Lamps, Side Right GND
End of Frame Primary Trailer Turn Lamps Left ! X56/10 X58/15 −Fuel Level Sensor, GND
Diff Lock Feedback Switch Supply (chopped), FA1 ! X56/11
Diff Lock Solenoid Driver, FA1 and FA2 ! X56/12 X59/14 −Temperature Sensor Rear Axle 2, GND
End of Frame Primary Trailer Tail Lamps ! X56/13 X59/17 −Temperature sensor rear axle 1, GND
End of Frame Primary Trailer Stop Lamps ! X56/14

BOARD
End of Frame Primary Trailer Marker Lamps ! X56/15

Turn Right Rear, Lower ! X58/1 X51/1 −SAM_Chas CAN_L −Cabin

Tail Lamp, Right ! X58/3 X51/2 −SAM_Chas CAN_H −Cabin
INTERNAL SAM PC

Turn Left Rear, Lower ! X58/10 X51/3 −Hard wired ISS, Chas
License Plate Lamp (First) ! X58/12
Marker Lamp, Side Right ! X58/13 X53/5 −Trailer ABS Connector (7), ABS Detection
Marker Lamp, Side Left ! X58/16

* When specified with Optimized Idle, these pins will not supply power when the key is in the ACC position,
Tail Lamp, Left ! X58/18 X56/4 −Diff Lock Solenoid Return, FA1 and FA2

nor during an Optimized Idle vehicle shutdown event. Optimized Idle is specified by a SAM Cab parameter.
UNFUSED OUTPUTS
Backup Lamp 1 ! X58/19

LOGIC CONTROLLED
X56/5 −Diff Lock Feedback Switch Return, FA1
Stop Lamp, Rear Right Lower ! X58/20 X56/6 −Diff Lock Feedback Switch Return, FA2
Stop Lamp, Rear Left Lower ! X58/21
705 — Unfused Outputs, Grounded Pins, and Inputs

X58/7 −Fuel Level Sensor, Feedback

Backup Switch, IGN (chopped) ! X59/1

Fig. 6, Unfused Outputs, Grounded Pins, and Inputs

Transmission Neutral switch, IGN (chopped) ! X59/2 X59/3 −Backup Switch, Return
Diff Lock Solenoid Driver, RA1 and RA2 ! X59/11 X59/9 −Fuel Water Separator Sensor, Feedback
Diff Lock Feedback Switch Supply (chopped), RA1 ! X59/19 X59/10 −Temperature Sensor Rear Axle 1, Feedback
Diff Lock Feedback Switch Supply (chopped), RA2 ! X59/20 X59/13 −Temperature Sensor Rear Axle 2, Feedback
X59/15 −Diff Lock Feedback Switch Return, RA1
SAM CHAS INPUTS

X59/16 −Diff Lock Solenoid Return, RA1 and RA2

X59/18 −Transmission Neutral Switch, Return
X59/21 −Diff Lock Feedback Switch Return, RA2

Ref. Dia. SAM_CHAS_unfused small.vsd

f545103
G02.05

G02.05/17
G02.05 SAM Chassis

706 — Logic Controlled Unfused Outputs

INPUTS SAM Chassis OUTPUT

09/19/2007 f545127a

Fig. 7, SAM Unfused Inputs and Outputs

1. Determine if the template has I/O controls available for the affected function.
Open the Datalink Monitor template for the function or output that is not functioning.
Are I/O control buttons available for the affected function?
YES!Go to test 2.
NO !Go to test 5.
2. Use the I/O control feature in Datalink Monitor to test the output circuit.
Does the function or output work when activated with Datalink Monitor?
YES!Go to test 3.
NO !Go to test 4.
3. Use Datalink Monitor to determine if input conditions are met for the function or output to operate.
Are all of the input conditions met?
!
YES Check SAM Chassis programming and parameters. For additional programming/parameter informa-
tion specific to this function, refer to the applicable subject in this manual. If programming/parameters are
OK, replace the SAM Chassis.
!
NO For additional input troubleshooting specific to this function, refer to the applicable subject in this
manual.
4. Rule out the output by manually applying fused power and ground.
Does the function or output work when power and ground are applied manually?
YES!Replace the SAM Chassis.
NO !The problem is in the output power or ground circuits, or the load itself. For additional output trou-
bleshooting specific to this function, refer to the applicable subject in this manual.
5. Determine if input conditions are met for the function or output to operate using Datalink Monitor.
NOTE: To determine which Datalink Monitor template to use, refer to the applicable subject in this
manual.

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SAM Chassis G02.05

5.1 Refer to the function or output in this manual to identify what input conditions have to be met in or-
der for the function or output to operate.
5.2 Open the Datalink Monitor template for the applicable function.
5.3 While monitoring the template inputs, attempt to activate the function or output using the normal
method. For example, turn on the headlights if the rotary switch inputs are being tested.
Are all of the input conditions met?
YES !Go to test 6.
NO !For additional input troubleshooting specific to this function, refer to the applicable subject in this
manual.
6. Check available voltage at the consumer.
NOTE: Available voltage tests cannot be performed on every SAM Chassis function. For example,
checking voltage at a turn signal connector will not work. Refer to the applicable subject in this
manual for more details about troubleshooting specific outputs. If test 6 cannot be performed, pro-
ceed to test 7.
6.1 Disconnect the connector at the consumer.
6.2 Activate the function by normal means. Turn on the headlights, for example, if the rotary switch in-
puts are being tested.
6.3 Measure voltage between the positive and ground pins on the connector.
Is there battery voltage across the positive and ground terminals?
YES !Replace the consumer.
NO !Go to test 7.
7. Rule out the output by manually applying fused power and ground.
7.1 Disconnect the SAM connector(s) containing the circuits for the output (power) and ground for the
function being tested.
7.2 Apply fused power to the output circuit using jumper wires, and apply ground to the ground circuit.
Does the function or output work when power and ground are applied manually?
!
YES Check SAM programming and parameters. For additional programming and parameter information,
refer to the applicable subject in this manual. If the programming and parameters are OK, replace the SAM
Chassis.
!
NO The problem is in the output power or ground circuits, or the load itself. For additional output trou-
bleshooting, refer to the applicable subject in this manual.

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G02.05 SAM Chassis

707 — Logic Controlled Relayed Fused Outputs

SAM Chassis

Internal Sam
INPUTS Circuit Board
Relay Fuse OUTPUT

09/19/2007 f545126a

Fig. 8, SAM Fused Inputs and Outputs

1. Determine if the template has I/O controls available for the affected function.
Open the Datalink Monitor template for the function or output that is not functioning.
Are I/O control buttons available for the affected function?
YES!Go to test 2.
NO !Go to test 3.
2. On SAM Chassis with I/O control, use Datalink Monitor to determine if the output circuit can be elim-
inated as the problem.
NOTE: To determine which Datalink Monitor template to use, refer to the applicable subject in this
manual.
2.1 Open the Datalink Monitor template for the applicable function.
2.2 Using the template, attempt to activate the function or output.
Does the function or output work when activated manually in Datalink Monitor?
NOTE: For normally closed relays, activating the SAM output will turn off the function the relay controls. For
normally open relays, activating the SAM output will turn on the function the relay controls.
YES!Go to test 3.
NO !Go to test 4.
3. Use Datalink Monitor to determine if input conditions are met for function or output to operate.
NOTE: To determine which Datalink Monitor template to use, refer to the applicable subject in this
manual.

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SAM Chassis G02.05

3.1 Refer to the applicable function or output, and identify what input conditions have to be met for nor-
mal operation.
3.2 Open the applicable Datalink Monitor template.
3.3 While monitoring the template inputs, attempt to active the function or output using the normal
method. Turn on the headlights, for example, if the rotary switch inputs are being tested.
Are all of the input conditions met?
YES !Go to test 4.
NO !For additional input troubleshooting specific to this function, refer to the applicable subject in this
manual.
4. Check the available voltage at the consumer.
NOTE: Available voltage tests cannot be performed on every SAM function. For example, checking
voltage at a turn signal connector will not work. Refer to the applicable subject for more informa-
tion about troubleshooting the specific outputs. If test 4 cannot be performed, proceed to test 5.
4.1 Disconnect the connector at the consumer.
4.2 Activate the function by normal means. Turn on the headlights, for example, if the rotary switch in-
puts are being tested.
4.3 Measure voltage between the positive and ground pins.
Is there battery voltage across the positive and ground terminals?
YES !Replace the consumer.
NO !Go to test 5.
5. Check for power at the relay coil (low current side).
5.1 Remove the relay from the SAM for the function that is not working.
5.2 Check for voltage in the SAM relay cavity that corresponds to terminal 85 of the relay.
Is there voltage at relay cavity 85?
YES !Go to test 6.
NO !Check fuse F29 on the SAM Chassis.
6. Check for power at the relay common (high current side).
Check for voltage in the SAM relay cavity that corresponds to terminal 30 of the relay.
Is there voltage at relay cavity 30?
YES !Go to test 7.
NO !Check main power to SAM from the MEGA fuse.
7. Check the SAM fuse for the function.
Check the fuse for the function or output.
Is the fuse good?
YES !Go to test 8.

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G02.05 SAM Chassis

!
NO Check for a short to ground in the output circuit. Check the component that the output supplies power
to for excessive current draw. Make repairs as necessary, and replace the fuse.
8. Determine if the function works when power is manually applied.
Using a fused jumper, apply power to the SAM relay cavity that corresponds to 87 for normally open relay
connections, or 87a for normally closed relays.
Does the function work when power is manually applied at the relay?
YES!Go to test 9.
NO !The problem is in the output power or ground circuits, or the load itself. For additional output trou-
bleshooting, refer to the applicable subject in this manual.
9. Determine if the output works with a test relay that is operating properly.
Remove the relay from the SAM and install the known good relay.
Does the function or output work with a known good relay?
YES!Replace the relay.
NO !Check SAM programming and parameters. For additional programming/parameter information, refer
to the applicable subject in this manual. If programming and parameters are OK, replace the SAM.

708 — Unfused Constant Outputs

SAM Chassis OUTPUT

09/11/2007 f545125

Fig. 9, SAM Unfused Constant Outputs

1. Check available voltage at the consumer.

1.1 Disconnect the connector at the consumer.
1.2 Measure the voltage between the positive and ground pins on the connector.
Is there battery voltage across the positive and ground terminals?
YES!Replace the consumer.
NO !Go to test 2.
2. Check the voltage at output pin.
2.1 Turn the ignition switch on.

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SAM Chassis G02.05

2.2 Check for voltage at the unfused constant output pin.

Is there 12V at the unfused constant output pin?
!
YES The problem is in the output power or ground circuits or the load itself. For additional output trou-
bleshooting refer to the applicable subject in this manual.
NO !For IGN and ACC outputs, check for ignition switch function. For all types, check the main power and
ground feeds to the SAM. If OK, replace the SAM.

709 — Fused Battery Pass-Through Outputs

BATT

SAM Chassis

Fuse OUTPUT

09/11/2007 f545128

Fig. 10, Fused Battery Pass-Through Outputs

1. Check the fuse in the SAM for the output.

Is the fuse OK?
YES !Go to test 2.
NO !Check for short to ground in the output circuit, repair as necessary, and then replace the fuse. For ad-
ditional output troubleshooting, refer to the applicable subject in this manual.
2. Check power and ground supply to the SAM.
Is power and ground supply to the SAM OK?
!
YES The problem is in the output power or ground circuits, or the load itself. For additional output trou-
bleshooting, refer to the applicable subject in this manual.
NO !Check the MEGA fuse, and the power and ground circuits to the SAM. Repair as necessary.

800 — Maximum Current Pin List

Legend:
NOTE: A dash indicates that information is not available at the time of publication.
• Type:
– "o" Pin: A high-side-driven output (the function activates at higher or near-battery voltage).
– "i" Pin: Input pin.
– "comm" Pin: Used for communication.

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G02.05 SAM Chassis

• Nominal Current (amps): The expected current under normal operating conditions.
 
• Maximum Continuous Current (amps): The maximum current without shutting the pin off at 77 F (25 C).
 
• Maximum Current (amps): When exceeded the pin will shut off at 185 F (85 C).

Maximum Current Pin List

Maximum
Nominal Maximum
Continuous
Connector Pin Function Type Current Current
Current
(Amps) (Amps)
(Amps)
X51 1 SAM Chassis, Cabin CAN Low (–) comm — — —
X51 2 SAM Chassis, Cabin CAN High (+) comm — — —
Hardwired ISS (Ignition Switch Status), SAM
X51 3 i — — —
Chassis
X52 1 Marker Lamp, Side Right o 0.7 1.8 14.5
X52 3 Marker Lamp, Corner Rear Right o 0.33 1.8 14.5
X53 1 Marker Lamp, Side Left o 0.7 1.8 14.5
X53 2 Marker Lamp, Corner Rear Left o 0.33 1.8 14.5
X53 5 Trailer ABS Connector (7), ABS Detection i — — —
o
X56 2 End-of-Frame Primary Trailer Power 0.5 0.7 2
(LS)
o
X56 4 Differential Lock Solenoid Return, FA1 and FA2 0.7 1.8 14.5
(LS)
X56 5 Differential Lock Feedback Switch Return, FA1 i — — —
X56 6 Differential Lock Feedback Switch Return, FA2 i — — —
X56 7 End-of-Frame Primary Trailer Turn Lamps Right o 0.5 1.8 14.5
X56 10 End-of-Frame Primary Trailer Turn Lamps Left o 0.5 1.8 14.5
Differential Lock Feedback Switch Supply
X56 11 o 0.04 1.8 14.5
(Chopped), FA1
X56 12 Differential Lock Solenoid Driver, FA1 and FA2 o 0.7 1.8 14.5
X56 13 End-of-Frame Primary Trailer Tail Lamps o 0.5 1.8 14.5
X56 14 End-of-Frame Primary Trailer Stop Lamps o 0.5 1.8 14.5
X56 15 End-of-Frame Primary Trailer Marker Lamps o 0.5 1.8 14.5
Air Dryer (Pneumatic, Electrically Heated),
X57 4 o 7 12.3 24.5
Accessory
X58 1 Turn Right Rear Lower o 2.2 3.9 35
X58 2 Not Connected o 0.5 1.8 14.5
X58 3 Tail Lamp Right o 0.7 1.8 14.5
X58 7 Fuel Level Sensor, Feedback i — — —
X58 10 Turn Left Rear Lower o 2.2 3.9 35
X58 12 License Plate Lamp o 0.7 1.8 14.5
X58 13 Marker Lamp, Side Right o 0.7 1.8 14.5
X58 16 Marker Lamp, Side Left o 0.7 1.8 14.5

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SAM Chassis G02.05

Maximum Current Pin List

Maximum
Nominal Maximum
Continuous
Connector Pin Function Type Current Current
Current
(Amps) (Amps)
(Amps)
X58 18 Tail Lamp, Left o 0.7 1.8 14.5
X58 19 Backup Lamp 1 o 5 8 17.2
X58 20 Stop Lamp, Rear Right Lower o 2.2 3.9 35
X58 21 Stop Lamp, Rear Left Lower o 2.2 3.9 35
X59 1 Backup Switch, Supply o 0.02 1.8 14.5
X59 2 Transmission Neutral Switch, Supply o 0.2 1.8 14.5
X59 3 Backup Switch, Return i — — —
X59 9 Fuel Water Separator Sensor, Feedback i — — —
X59 10 Temperature Sensor Rear Axle 1, Feedback i — — —
X59 11 Differential Lock Solenoid Driver, RA1 and RA2 o 0.7 1.8 14.5
X59 13 Temperature Sensor Rear Axle 2, Feedback i — — —
X59 15 Differential Lock Feedback Switch Return, RA1 i — — —
o
X59 16 Differential Lock Solenoid Return, RA1 and RA2 0.7 1.8 14.5
(LS)
X59 18 Transmission Neutral Switch Return i — — —
Differential Lock Feedback Switch Supply
X59 19 o 0.04 1.8 14.5
(Chopped), RA1
Differential Lock Feedback Switch Supply
X59 20 o 0.04 1.8 14.5
(Chopped), RA2
X59 21 Differential Lock Feedback Switch Return, RA2 i — — —
Table 6, SAM Cab Maximum Current Pin List

Cascadia Troubleshooting Manual, March 2016 G02.05/25