AutoCodes – Generic – B3797

B3797 Code - All Door Dead Lock Circuit

Quick Answer

The Body Control Module (BCM) powers the reversible door latch assemblies by providing battery positive voltage and ground to the appropriate lock and unlock control circuits of the door latch assemblies. Common causes include Faulty Door Latch Assembly, Door Latch Assembly harness is open or shorted, Door Latch Assembly circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B3797 indicates All Door Dead Lock Circuit.
Common causes: Common causes include Faulty Door Latch Assembly, Door Latch Assembly harness is open or shorted, Door Latch Assembly circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 3,578

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 15, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3797 Description

The Body Control Module (BCM) powers the reversible door latch assemblies by providing battery positive voltage and ground to the appropriate lock and unlock control circuits of the door latch assemblies. The lock and unlock control circuits of the rear doors and passenger door latch assemblies are all connected together. When the door latch assemblies are not active, all actuator lock and unlock control circuits are supplied a floating voltage used by the BCM to perform diagnostic functions on the circuits. Transitioning of the lock actuators to the lock or unlocked position depends upon which control circuits receive voltage and which control circuits receive ground.
The instrument panel right fuse block contains a PCB relay which controls the functions of the electronic child locks which is part of the rear door latch assemblies. When the relay is in its inactive state and the BCM commands the latches to LOCK and UNLOCK, voltage will pass through the relay contacts for normal LOCK and UNLOCK functions of the passenger, left rear and right rear door latch assemblies.
The Diagnostic Trouble Code (DTC) sets when the BCM detects a short to ground in the door lock relay control circuit.

OBDII Code B3797 - All Door Dead Lock Circuit - AutoCodes.com — B3797 Code - All Door Dead Lock Circuit

What does this mean?

What are the Possible Causes of the DTC B3797?

Faulty Door Latch Assembly
Door Latch Assembly harness is open or shorted
Door Latch Assembly circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3797?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3797 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B3797 code?

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Need Help with the Code?

Get the B3797 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B3797 Buick — All Door Dead Lock Circuit
B3797 Cadillac — All Door Dead Lock Circuit
B3797 Chevrolet — All Door Dead Lock Circuit
B3797 GMC — All Door Dead Lock Circuit

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B3797 Code

1. What are common symptoms of OBDII code B3797 (All Door Dead Lock Circuit)?

Symptoms may include all doors being unable to lock or unlock using the central locking system.

2. What are possible causes of OBDII code B3797?

Potential causes include a faulty door lock actuator, damaged wiring in the door circuits, or a malfunctioning central locking control module.

3. How can I diagnose the issue related to OBDII code B3797?

Diagnosis typically involves checking the operation of each door lock actuator, inspecting the wiring for any damage, and testing the central locking control module for proper functionality.

4. Can I still drive my vehicle with OBDII code B3797 present?

While the code indicates an issue with the door locking system, it is generally safe to drive the vehicle. Just be aware that the central locking feature may not work properly.

5. Are there any temporary fixes for OBDII code B3797?

A temporary fix may involve manually locking and unlocking each door until the underlying issue is resolved. However, it is recommended to address the root cause as soon as possible.

6. How much does it typically cost to repair OBDII code B3797?

Repair costs can vary depending on the specific cause of the issue. It may involve replacing a faulty door lock actuator, repairing damaged wiring, or reprogramming the central locking control module.

7. Can OBDII code B3797 be triggered by a dead car battery?

A dead car battery can sometimes cause issues with the central locking system, potentially leading to the triggering of code B3797. It is advisable to check the battery health as well.

8. Will disconnecting the car battery reset OBDII code B3797?

Disconnecting the car battery may temporarily clear the code, but it is not a guaranteed fix. The underlying issue should still be investigated and addressed to prevent the code from reoccurring.

9. Can extreme weather conditions affect OBDII code B3797?

Extreme temperatures or moisture can impact the electrical components of the door locking system, potentially leading to issues related to code B3797. Proper insulation and maintenance can help prevent such problems.

10. Is it possible to prevent OBDII code B3797 from occurring in the future?

Regular maintenance of the door locking system, including checking for any signs of wear or damage, can help prevent issues related to code B3797. Promptly addressing any abnormalities can also reduce the risk of the code reoccurring.