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DTC B3797

DTC B3797

Diagnostic Instructions


• Perform the prior to Diagnostic System Check - Vehicle 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 B3797 02

All Door Dead Lock Circuit Short to Ground

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Door Lock Sec Relay Control B3797 02 1 1 -
1. Door Dead Lock Malfunction


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

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

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 and UNLOCK with a scan tool. The test lamp should illuminate while commanding the LOCK state.

4. 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 K9 BCM.

5. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

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


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Front Compartment Fuse Block Replacement

• Control Module References for BCM replacement, setup, and programming