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Chevrolet Silverado / GMC Sierra. Manual - part 1532
Fig. 6: Door Lock, Window and Lighting System References
Courtesy of GENERAL MOTORS CORP.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Vehicle Access - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 7: Outside Rearview Mirror References
Courtesy of GENERAL MOTORS CORP.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Vehicle Access - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 8: Heated Seat References
Courtesy of GENERAL MOTORS CORP.
DIAGNOSTIC INFORMATION AND PROCEDURES
DIAGNOSTIC CODE INDEX
DIAGNOSTIC CODE INDEX
DIAGNOSTIC STARTING POINT - VEHICLE ACCESS
DTC
Description
DTC B1023
B1023 00: Integral Switch Performance
DTC B3125
B3125 00: Driver Door Only Unlock Circuit
DTC B3130
B3130 00: All Door Unlock Circuit
DTC B3135
B3135 00: All Door Lock Circuit
DTC B3140, B3145,
B3150, or B3155
B3140: Driver Unlock Switch Circuit
B3145: Passenger Unlock Switch Circuit
B3150: Driver Lock Switch Circuit
B3155: Right Front Lock Switch Circuit
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Vehicle Access - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Begin the system diagnosis with the 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
system and where the procedure is located.
DTC B1023
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach
Diagnostic Procedure Instructions provides an overview of each diagnostic category
DTC Descriptor
DTC B1023 00
Integral Switch Performance
Circuit/System Description
The driver and passenger door lock and side window switches are integrated control module
switch assemblies.
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
The driver or passenger door module receives simultaneous active signals from both sides of an
integrated switch.
Action Taken When the DTC Sets
The driver or passenger door module ignores inputs from the malfunctioning switch.
Conditions for Clearing the DTC
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Vehicle Access - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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