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Chevrolet Silverado / GMC Sierra. Manual - part 1533
The DTC will be current for as long as the fault is present.
When the fault is no longer present, the DTC will be a history status code.
A history DTC will clear after 50 ignition cycles or with a scan tool using the clear DTCs
function.
Reference Information
Schematic Reference
Door Control Module Schematics
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 Verification
1. Install a scan tool and display the inputs data list of the affected door module.
If any of the integrated switch inputs are displayed as Active while in an inactive state,
replace the door module.
2. Clear the DTCs.
3. Activate all of the integrated switch functions.
If the DTC resets, replace the affected door module.
Repair Procedures
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Vehicle Access - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for driver or passenger door loch and side window switch
replacement, programming, and setup.
DTC B3125
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 B3125 00
Driver Door Only Unlock Circuit
Circuit/System Description
The body control module (BCM) energizes the driver door unlock relay coil through a low side
drive control circuit. When the BCM receives an unlock message the driver door unlock relay
control circuit is grounded energizing the driver door unlock relay coil.
Conditions for Running the DTC
Battery voltage is between 9-16 volts.
The BCM has attempted to energize the unlock relay.
Conditions for Setting the DTC
The driver door unlock relay control circuit is shorted to voltage.
Action Taken When the DTC Sets
The BCM will not attempt unlock 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.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Vehicle Access - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Reference Information
Schematic Reference
Door Lock/Indicator Schematics
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 6 to ground.
2. Ignition ON, verify that the test lamp does not illuminate.
If the test lamp illuminates test the 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 B3130
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Vehicle Access - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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 B3130 00
All Door Unlock Circuit
Circuit/System Description
The body control module (BCM) energizes the unlock relay coil through a low side drive control
circuit. When the BCM receives an unlock message the door unlock control circuit is grounded
energizing the unlock relay coil.
Conditions for Running the DTC
Battery voltage is between 9-16 volts.
The BCM has attempted to energize the unlock relay.
Conditions for Setting the DTC
The door unlock control circuit is shorted to voltage.
Action Taken When the DTC Sets
The BCM will not attempt unlock 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
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Vehicle Access - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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