AutoCodes – Generic – B154A

B154A 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 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 416

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC B154A?

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?

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 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 B154A code?

Need more information on how to fix the B154A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B154A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B154A Buick — Driver Mirror Internal Malfunction
B154A Cadillac — Driver Mirror Internal Malfunction
B154A Chevrolet — Driver Mirror Internal Malfunction
B154A GMC — Driver Mirror Internal Malfunction

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 Code

1. What are the common symptoms of OBDII code B154A (Driver Mirror Internal Malfunction)?

When this code is present, you may experience issues with the driver-side mirror, such as erratic movement, failure to adjust properly, or complete non-functionality.

2. What are the possible causes of OBDII code B154A?

The most common causes of this code are a faulty mirror motor, damaged mirror wiring, or a malfunctioning mirror control module.

3. How can I diagnose OBDII code B154A?

Diagnosing this code typically involves visually inspecting the mirror, checking the wiring for any damage, and using a scan tool to communicate with the mirror control module for further troubleshooting.

4. Can I still drive my vehicle with OBDII code B154A?

Yes, you can still safely drive your vehicle with this code, but it is recommended to address the issue promptly to ensure proper functionality of the driver-side mirror.

5. How can I repair OBDII code B154A?

Repairing this code usually involves replacing the faulty mirror motor, repairing damaged wiring, or replacing the mirror control module, depending on the specific cause of the malfunction.

6. Can weather conditions affect OBDII code B154A?

Extreme weather conditions, such as heavy rain or snow, can potentially exacerbate issues related to this code if moisture enters the mirror assembly or wiring, leading to malfunctions.

7. Is it possible to reset OBDII code B154A without repairs?

While clearing the code temporarily using a scan tool is possible, it is recommended to address the underlying issue to prevent the code from reoccurring and ensure proper mirror functionality.

8. How long does it take to repair OBDII code B154A?

The repair time for this code can vary depending on the specific cause and the complexity of accessing the mirror components, but it typically takes around 1-2 hours for a professional technician.

9. Can OBDII code B154A affect other electrical components in the vehicle?

While this code is specific to the driver-side mirror, electrical issues in the mirror system can sometimes impact other related components, such as the power mirror switch or the vehicle's overall electrical system.

10. Is it possible to prevent OBDII code B154A from occurring again?

Regularly inspecting the mirror assembly, ensuring proper wiring connections, and protecting the mirror from environmental damage can help prevent the recurrence of this code in the future.

1. What are the common symptoms of OBDII code B154A - Driver Mirror Internal Malfunction?

The common symptoms of this code may include erratic movement or failure of the driver-side mirror, inability to adjust the mirror electronically, or warning lights on the dashboard.

1. What are common symptoms of OBDII code B154A (Driver Mirror Internal Malfunction)?

- Common symptoms include the driver-side mirror not adjusting properly or moving erratically, or the mirror control functions not working at all.

2. What can cause the OBDII code B154A to trigger?

- The code can be triggered by internal malfunctions within the driver-side mirror assembly, such as damaged wiring, a faulty mirror motor, or issues with the mirror control module.

3. How can I diagnose the cause of OBDII code B154A?

- Diagnosing the code may involve visually inspecting the mirror for any visible damage, checking the mirror motor for proper operation, and using a diagnostic scanner to retrieve specific error codes.

4. Is it safe to drive with OBDII code B154A active?

- It is generally safe to drive with this code, but you may experience inconvenience due to the malfunctioning driver-side mirror. However, it is recommended to address the issue promptly to ensure proper functionality.

5. Can I repair OBDII code B154A myself?

- Depending on your level of automotive expertise, you may be able to address this code yourself by inspecting the mirror assembly, checking for loose connections, or replacing faulty components like the mirror motor.

6. Are there any quick fixes for OBDII code B154A?

- Quick fixes may include checking and securing any loose wiring connections related to the driver-side mirror, ensuring proper power supply to the mirror assembly, or resetting the mirror control module.

7. What are the potential costs associated with repairing OBDII code B154A?

- The costs of repairing this code can vary depending on the underlying cause. Expenses may include replacement parts, labor costs if professional assistance is needed, and diagnostic fees.

8. Can OBDII code B154A affect other vehicle systems?

- This code typically only affects the driver-side mirror functionality and may not directly impact other vehicle systems. However, addressing the issue promptly can help prevent any potential electrical problems.

9. How long does it usually take to repair OBDII code B154A?

- The repair time for this code can vary based on the cause of the malfunction. Simple fixes like reconnecting loose wires may take a short time, while more complex issues could require more extensive troubleshooting and repair work.

10. Does OBDII code B154A require immediate attention?

- While the code may not pose an immediate safety risk, it is recommended to address it in a timely manner to ensure proper operation of the driver-side mirror and maintain overall vehicle functionality.