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Chevrolet Silverado / GMC Sierra. Manual - part 2789
3. Adjust the sunroof window panel as necessary. Refer to Sunroof Window Height and
Opening Fit Adjustment.
Tighten: Tighten the screws to 3 N.m (27 lb in).
DESCRIPTION AND OPERATION
SUNROOF DESCRIPTION AND OPERATION
The power sunroof is operated by the sunroof motor/actuator which consists of the motor and
electronic control unit as a complete assembly. The system is powered by a battery supply circuit
and an ignition/retained accessory power signal circuit determines when the sunroof may be
operated. The switch signal circuits are supplied battery voltage through a resistor and monitored
within the ECU. When a sunroof switch is pressed the switch signal circuit is closed to ground
and most of the voltage supplied to the signal circuit will be dropped across the resistor within
the ECU indicating the switch is active.
NOTE:
Refer to Fastener Notice .
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Sunroof - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
2008 BRAKES
Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
SCHEMATIC AND ROUTING DIAGRAMS
TRAILER BRAKE CONTROL SCHEMATICS
Fig. 1: Module Power and Ground
Courtesy of GENERAL MOTORS CORP.
Application
Specification
Metric
English
Trailer Brake Control Module Bolt
9 N.m
80 lb in
Trailer Brake Control Relay Bolt
9 N.m
80 lb in
2008 Chevrolet Silverado 1500
2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
2008 Chevrolet Silverado 1500
2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 2: Trailer Brake Controls
Courtesy of GENERAL MOTORS CORP.
DIAGNOSTIC INFORMATION AND PROCEDURES
DIAGNOSTIC CODE INDEX
DIAGNOSTIC CODE INDEX
DTC
Description
DTC B3894
B3894 5A: Stop Lamp Switch Circuit Plausibility Failure
DTC C0561
C0561 F0: System Disabled Information Stored Invalid Serial
Data Received
C0561 F1: System Disabled Information Stored Invalid Serial
Data Received
DTC C056D or C056E
C056D 33: ECU Hardware Performance Special Memory
Failure
C056D 34: ECU Hardware Performance RAM Failure
C056D 35: ECU Hardware Performance ROM Failure
C056D 36: ECU Hardware Performance EEPROM Failure
2008 Chevrolet Silverado 1500
2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
DIAGNOSTIC STARTING POINT - TRAILER BRAKE CONTROLS
Begin the system diagnosis with Diagnostic System Check - Vehicle . The Diagnostic System
Check 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 diagnostic trouble codes (DTCs) and their status
The use of the Diagnostic System Check will identify the correct procedure for diagnosing the
C056D 39: ECU Hardware Performance Internal Electronic
Failure (ECU processor failure)
C056E 41: ECU Software Performance Operational
Software/Calibration Set Not Programmed
DTC C0800
C800 03: Device Power Circuit Voltage Below Threshold
C800 07: Device Power Circuit Voltage Above Threshold
DTC C0845
C0845 03: Device Ignition 1 Circuit Voltage Below Threshold
DTC C0870
C0870: Device Voltage Reference Output 1 Circuit
DTC C0880
C0880: Device Voltage Reference Output 2 Circuit
DTC C0890
C0890: Device Voltage Reference Output 3 Circuit
DTC C1112
C1112: Trailer Brake Control Relay Low Control Circuit -
Relay Control Active Low
DTC C1113
C1113 01: Trailer Brake Control Relay High Control Circuit
Short to Battery
DTC C1114
C1114: Trailer Brake Control Solenoids Control Circuit-
Trailer Auxiliary Supply Voltage
DTC C1115
C1115 08: Manual Trailer Brake Apply Request Switch Signal
Invalid-Manual Apply Switch Stuck Closed
C1115 5A: Manual Trailer Brake Apply Request Switch Signal
Plausibility Failure
DTC C1116
C1116: Manual Trailer Brake Apply Request Signal 1
DTC C1117
C1117: Manual Trailer Brake Apply Request circuit Signal 2-
Redundant Manual Apply Signal
DTC C1118
C1118: Trailer Brake Control Sensitivity Switch Circuit
C1118 08: Trailer Brake Control Sensitivity Switch Circuit
Signal Invalid
DTC C1119
C1119: Trailer Brake Control Relay Feedback Circuit
2008 Chevrolet Silverado 1500
2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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