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Chevrolet Silverado / GMC Sierra. Manual - part 1534
Connector End View Reference
Component Connector End Views
Description and Operation
Power Door Locks Description and Operation
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Control Module References for Scan Tool Information
Circuit/System Testing
1. Disconnect the BCM connector X7 and connect a test lamp from terminal 9 to ground.
2. Ignition ON, verify that the test lamp does not illuminate.
If the test lamp illuminates test the door unlock control circuit for a short to voltage. If
the circuit tests normal replace the IP fuse block.
3. If the circuits test normal replace the BCM.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Instrument Panel Electrical Center or Junction Block Replacement - Left Side
Control Module References for BCM replacement, programming, and setup.
DTC B3135
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
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Vehicle Access - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Diagnostic Procedure Instructions provides an overview of each diagnostic category
DTC Descriptor
DTC B3135 00
All Door Lock Circuit
Circuit/System Description
The body control module (BCM) energizes the lock relay coil through a high side drive control
circuit. When the BCM receives a lock message voltage is supplied to the door lock control
circuit energizing the lock relay coil.
Conditions for Running the DTC
Battery voltage is between 9-16 volts.
The BCM has attempted to energize the lock relay.
Conditions for Setting the DTC
The door lock control circuit is shorted to ground.
Action Taken When the DTC Sets
The BCM will not attempt lock operation.
Conditions for Clearing the DTC
When the output request is not active the DTC will be a history status code.
The history code will clear after 50 fault free ignition cycles or by using the scan tool clear
DTCs feature.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
Component Connector End Views
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Vehicle Access - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Description and Operation
Power Door Locks Description and Operation
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Control Module References for Scan Tool Information
Circuit/System Testing
1. Disconnect the IP fuse block and connect a test lamp from battery voltage to the door
unlock control circuit terminal A2 X3.
2. Verify that the test lamp does not illuminate.
If the test lamp illuminates test the door lock control circuit for a short to ground. If
the circuit tests normal replace the BCM.
3. If the circuits test normal replace the IP fuse block.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Instrument Panel Electrical Center or Junction Block Replacement - Left Side
Control Module References for BCM replacement, programming, and setup.
DTC B3140, B3145, B3150, OR B3155
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 Descriptors
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Vehicle Access - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
DTC B3140
Driver Unlock Switch Circuit
DTC B3145
Passenger Unlock Switch Circuit
DTC B3150
Driver Lock Switch Circuit
DTC B3155
Right Front Lock Switch Circuit
Diagnostic Fault Information
Circuit/System Description
The power door lock switch signal circuits are referenced from battery voltage by the body
control module (BCM). When a switch is pressed to the lock or unlock position the appropriate
signal circuit is grounded. When a signal circuit is grounded the reference voltage goes low
indicating to the BCM that the corresponding switch is active.
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
Driver Door Switch Lock
Signal
B3150
1
1
-
Driver Door Switch Unlock
Signal
B3140
2
2
-
Passenger Door Switch Lock
Signal
B3155
3
3
-
Passenger Door Switch
Unlock Signal
B3145
4
4
-
Low Reference
-
5
-
-
1. Lock inoperative from driver switch
2. Unlock inoperative from driver switch
3. Lock inoperative from passenger switch
4. Unlock inoperative from passenger switch
5. Lock/Unlock inoperative from driver or passenger switch
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Vehicle Access - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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