Chevrolet Silverado / GMC Sierra. Service 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