B3797

DTC B3797

Diagnostic Instructions

* Perform the prior to Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptor
DTC B3797 02
- All Door Dead Lock Circuit Short to Ground

Diagnostic Fault Information





Circuit/System Description

When the body control module (BCM) receives a command to activate the door dead locks, the BCM will apply voltage to the DOOR LK SEC pcb relay. This will energize the relay closing the contacts and enable the BCM to supply voltage to the dead locks in each of the doors.

Conditions for Running the DTC

The system voltage must be between 9-16 V.

Conditions for Setting the DTC

The BCM detects a short to ground in the DOOR LK SEC pcb relay control circuit.

Action Taken When the DTC Sets

The dead locks will be inoperative

Conditions for Clearing the DTC

* This DTC will change from current to history when the fault is no longer present.
* A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

Reference Information
Schematic Reference

Door Lock/Indicator Schematics (Door Lock/Indicator Schematics)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Power Door Locks Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, command the Door Deadlock Lock/Unlock to LOCK and UNLOCK with a scan tool. Listen or feel for the operation of the deadlock actuators performing the LOCK and UNLOCK functions.

Circuit/System Testing

1. Ignition OFF, disconnect the X2 harness connector at the rear fuse block
2. Connect a test lamp between the control circuit terminal 32 and ground.
3. Ignition ON, command the Door Deadlock Lock/Unlock to LOCK with a scan tool. The test lamp should illuminate while commanding the LOCK state.

• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.

4. If all circuits test normal, replace the rear fuse block.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Fuse Block Replacement (Fuse Block Replacement)
* Control Module References (Programming and Relearning) for BCM replacement, setup and programming