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DTC B3797

DTC B3797

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 has overviews of all diagnostic categories.


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 Switch Signal

B3150 00

B3150 00

B3150 00

-

Door Unlock Switch Signal

B3140 00

B3140 00

B3140 00

-

Driver Door Unlock Control

B3125 02, B3130 02, B3135 02

1, 2

1, 2

-

Doors Lock Control

B3125 02, B3130 02, B3135 02

1, 2, 3

1, 2, 3

-

Passenger Doors Unlock Control

B3125 02, B3130 02, B3135 02

1, 3

1, 3

-

Doors Dead Lock Control

B3797 02

1, 2, 3

1, 2, 3

-

Door Lock Switch Ground

-

1, 2, 3

1, 2, 3

-

1. Door Lock Malfunction

2. Driver Door Unlock Malfunction

3. Door Unlock Malfunction



Circuit/System Description

The body control module (BCM) controls the driver door lock relay.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

The BCM detects a short to ground in the doors dead lock circuit.

Action Taken When the DTC Sets


• The BCM stores the DTC to memory.

• The power door 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 information on diagnostic tools

Circuit/System Verification

Ignition ON, command the Door Deadlock to Lock and Unlock with a scan tool. Listen or feel for the operation of the door deadlock actuators locking and unlocking.

Circuit/System Testing


1. Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module.

2. Test for greater than 50 Ω between the control circuit terminal 4 and ground.

3. If less than the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the X50A Fuse Block - Underhood.

4. If all circuits test normal, replace the K9 Body Control Module


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


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

• Underhood Electrical Center or Junction Block Replacement