AutoCodes – Buick – B3147 Buick

B3147 Buick Code - Right Front Unlock Switch Circuit Low

Quick Answer

The switch that failed and generated the Diagnostic Trouble Code (DTC) is wired to either the Driver Door Switch Assembly (DDSA) or the Passenger Front Door Module (PDM). Common causes include Faulty Right Front Power Door Lock Switch, Right Front Power Door Lock Switch harness is open or shorted, Right Front Power Door Lock Switch 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: B3147 Buick indicates Right Front Unlock Switch Circuit Low.
Common causes: Common causes include Faulty Right Front Power Door Lock Switch, Right Front Power Door Lock Switch harness is open or shorted, Right Front Power Door Lock Switch 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 532

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 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3147 Buick Description

The switch that failed and generated the Diagnostic Trouble Code (DTC) is wired to either the Driver Door Switch Assembly (DDSA) or the Passenger Front Door Module (PDM). When a door lock switch is activated to the Lock or Unlock function, the DDSA or PDM receives the switch input and sends the information on, via the Serial Data Class 2 communications line, to the Rear Integration Module (RIM), which is the master of all lock operations. If the RIM determines that the message is a valid request and conditions are correct for a door lock function to occur, it sends its OK back to all the door modules to Lock or Unlock the doors. Each door module supplies power and ground to its associated lock actuator to Lock or Unlock the associated door.

OBDII Code B3147 Buick - Right Front Unlock Switch Circuit Low - AutoCodes.com — B3147 Buick Code - Right Front Unlock Switch Circuit Low

What does this mean?

What are the Possible Causes of the DTC B3147 Buick?

Faulty Right Front Power Door Lock Switch
Right Front Power Door Lock Switch harness is open or shorted
Right Front Power Door Lock Switch circuit poor electrical connection
Faulty Passenger Front Door Module (PDM)

How to Fix the DTC B3147 Buick?

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 B3147 Buick 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.

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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 B3147 Buick Code

1. What does the OBDII code B3147 mean on a Buick?

B3147 indicates an issue in the Right Front Unlock Switch Circuit, specifically that the circuit is showing a low voltage condition.

2. What are the common symptoms of the B3147 code?

Symptoms may include the right front door not unlocking, intermittent unlocking issues, or no response when using the door switch.

3. What causes the B3147 code to appear?

Common causes include a faulty unlock switch, damaged or corroded wiring, poor electrical connections, or a malfunctioning door module.

4. Can a blown fuse cause the B3147 code?

Yes, a blown fuse related to the door lock system can cause this code, as it may interrupt power to the unlock switch circuit.

5. How do I diagnose the B3147 code on my Buick?

Start by inspecting the wiring and connectors for the right front unlock switch, checking for damage or corrosion. Use a multimeter to test the switch and circuit voltage.

6. Is the B3147 code serious?

While it may not affect drivability, the code can cause inconvenience with door locking/unlocking and should be addressed to restore proper functionality.

7. How can I fix the B3147 code?

Repairs may include replacing the faulty unlock switch, repairing damaged wiring, cleaning corroded connectors, or replacing the door module if necessary.

8. Do I need to reprogram anything after fixing the B3147 code?

In some cases, resetting the vehicle's control module or reprogramming the door module may be required after repairs.

9. Can I still use my car if the B3147 code is active?

Yes, you can still drive the vehicle, but the right front door unlock function may not work properly.

10. Will clearing the B3147 code fix the problem?

Clearing the code will temporarily reset it, but the underlying issue must be fixed to prevent the code from returning.

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