AutoCodes – Buick – B154A Buick

B154A Buick Code - Driver Mirror Internal Malfunction

Quick Answer

The outside mirror switch and passenger window switch are on a serial data circuit with the memory seat module as the master. Common causes include Faulty Driver Outside Rearview Mirror Motor, Driver Outside Rearview Mirror Motor harness is open or shorted, Driver Outside Rearview Mirror Motor 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: B154A Buick indicates Driver Mirror Internal Malfunction.
Common causes: Common causes include Faulty Driver Outside Rearview Mirror Motor, Driver Outside Rearview Mirror Motor harness is open or shorted, Driver Outside Rearview Mirror Motor 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 166

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 Apr 21, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B154A Buick Description

The outside mirror switch and passenger window switch are on a serial data circuit with the memory seat module as the master. The mirror select and directional control switches are inputs to the memory seat module through the serial data circuit. When the memory seat module receives switch inputs from the outside mirror switch, mirror output commands are sent to the appropriate switch through the serial data circuit. The outside mirror switch and passenger window switch control the left and right outside rearview mirrors through bi-directional motor control circuits. The motor control circuits are floating while in an inactive state and the switches will apply power and ground to the control circuits as necessary to move the mirror in the commanded direction.
Mirror position is determined by both horizontal and vertical position sensors in each of the power mirrors. The outside mirror switch and passenger window switch supply a 5 V reference, low reference, and horizontal and vertical position signal circuits to these sensors. The signal circuits are referenced from 5 V by the switches and the signal circuit voltage levels represent the mirror positions. The mirror positions are sent to the memory seat module through the serial data circuit where they are stored for memory mirror operation. When the memory seat module receives a memory recall command, the memory seat module will send the go to position commands to the outside mirror switch and passenger window switch. The switches will then drive the appropriate mirror motors to the commanded position sensor settings.
The Diagnostic Trouble Code (DTC) will be set when an internal malfunction has been detected by the outside rearview mirror switch while commanding the driver outside rearview mirror UP, DOWN, LEFT, or RIGHT.

OBDII Code B154A Buick - Driver Mirror Internal Malfunction - AutoCodes.com — B154A Buick Code - Driver Mirror Internal Malfunction

What does this mean?

What are the Possible Causes of the DTC B154A Buick?

Faulty Driver Outside Rearview Mirror Motor
Driver Outside Rearview Mirror Motor harness is open or shorted
Driver Outside Rearview Mirror Motor circuit poor electrical connection

How to Fix the DTC B154A 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 B154A 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 B154A Buick Code

1. What are the common symptoms of OBDII code B154A in a Buick related to the driver mirror internal malfunction?

- The common symptoms include erratic movement or failure of the driver-side mirror, inability to adjust the mirror electronically, or the mirror getting stuck in one position.

2. What are the possible causes of OBDII code B154A Buick related to the driver mirror internal malfunction?

- The code B154A typically indicates a fault in the driver mirror motor, a wiring issue in the mirror circuit, a malfunctioning mirror switch, or a problem with the mirror control module.

3. How can I diagnose the driver mirror internal malfunction causing OBDII code B154A in my Buick?

- To diagnose the issue, you can start by checking the mirror fuse, inspecting the wiring for any visible damage, testing the mirror motor for functionality, and using a scan tool to retrieve specific error codes.

4. Can I still drive my Buick with OBDII code B154A related to the driver mirror internal malfunction?

- Yes, you can still drive your Buick with this code, but you may experience inconvenience due to the malfunctioning driver-side mirror. It is recommended to address the issue promptly for safety and convenience.

5. How do I repair the driver mirror internal malfunction triggering OBDII code B154A in my Buick?

- Repairing the issue involves replacing the faulty mirror motor, repairing any damaged wiring, ensuring the mirror switch is working correctly, or replacing the mirror control module if necessary.

6. Is it possible to reset OBDII code B154A in my Buick without fixing the driver mirror internal malfunction?

- While you can clear the code temporarily, it will likely reappear until you address the underlying driver mirror internal malfunction causing the issue.

7. Can extreme weather conditions contribute to triggering OBDII code B154A in a Buick related to the driver mirror internal malfunction?

- Yes, extreme temperatures or moisture can potentially affect the electrical components of the driver mirror system, leading to malfunctions and triggering the code B154A.

8. Are there any preventive measures I can take to avoid encountering OBDII code B154A Buick related to the driver mirror internal malfunction?

- Regularly inspecting the driver-side mirror for proper functionality, addressing any issues promptly, and ensuring the mirror system is well-maintained can help prevent the occurrence of this code.

9. Will fixing OBDII code B154A related to the driver mirror internal malfunction affect other vehicle systems in my Buick?

- Fixing this code specifically targets the driver mirror system and should not have a direct impact on other vehicle systems unless there are underlying electrical issues affecting multiple components.

10. How long does it typically take to repair the driver mirror internal malfunction triggering OBDII code B154A in a Buick?

- The repair time can vary depending on the exact cause of the issue, but in general, fixing the driver mirror internal malfunction should not take more than a few hours at a professional repair facility.