B154B:39 Code - Passenger 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 Passenger Outside Rearview Mirror Motor, Passenger Outside Rearview Mirror Motor harness is open or shorted, Passenger 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
- B154B:39 indicates Passenger Mirror Internal Malfunction.
- Common causes
- Common causes include Faulty Passenger Outside Rearview Mirror Motor, Passenger Outside Rearview Mirror Motor harness is open or shorted, Passenger 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.
Code B154B:39 Description
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 passenger window switch while commanding the passenger outside rearview mirror UP, DOWN, LEFT, or RIGHT.
What are the Possible Causes of the DTC B154B:39?
- Faulty Passenger Outside Rearview Mirror Motor
- Passenger Outside Rearview Mirror Motor harness is open or shorted
- Passenger Outside Rearview Mirror Motor circuit poor electrical connection
How to Fix the DTC B154B:39?
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 B154B:39 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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Frequently Asked Questions about B154B:39 Code
1. What does OBDII code B154B:39 mean?
Code B154B:39 indicates a "Passenger Mirror Internal Malfunction" and suggests an issue with the internal electronics or motor of the passenger side mirror.
2. What are the common symptoms of the B154B:39 code?
Symptoms include the passenger side mirror not adjusting, folding, or heating properly, or a complete lack of functionality.
3. What causes the B154B:39 code to appear?
The code may be triggered by a faulty mirror motor, damaged wiring, a blown fuse, or a malfunction in the mirror control module.
4. Can the B154B:39 code cause other issues in the vehicle?
Typically, this code only affects the functionality of the passenger side mirror and does not impact other vehicle systems.
5. How can I diagnose the B154B:39 code?
Start by inspecting the passenger side mirror for physical damage and checking the wiring and connectors for loose or damaged connections. Use a scan tool to confirm the fault.
6. Can I clear the B154B:39 code without fixing the issue?
Clearing the code without addressing the underlying problem will likely cause it to return as the issue persists.
7. How do I fix the B154B:39 code?
Repairs may involve replacing the mirror motor, repairing damaged wiring, or replacing the mirror control module if necessary.
8. Is it safe to drive with the B154B:39 code?
Yes, it is generally safe to drive, but the loss of mirror functionality could reduce visibility and compromise safety.
9. How much does it cost to repair the B154B:39 code?
Repair costs vary depending on the issue, ranging from $50 for minor wiring repairs to $300 or more for replacing the mirror assembly.
10. Can I fix the B154B:39 code myself?
If you have basic automotive repair knowledge, you can check wiring and connections or replace the mirror assembly. For complex diagnostics, consult a professional.
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