Rear Left Vanity Mirror Light Circuit Malfunction
The B0158 code means the vehicle's onboard diagnostic system has detected: Rear Left Vanity Mirror Light Circuit Malfunction. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $10 - $100 (parts and labor)
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Common Symptoms
- Vanity mirror light not illuminating
- Light does not activate when visor mirror opens
- Dim vanity mirror illumination
- Vanity mirror light flickers
Probable Causes (Ranked by Likelihood)
- Burned out vanity mirror bulb Very High
- Failed visor mirror switch High
- Corroded wiring in visor pivot Moderate
- BCM vanity light output fault Low
Step-by-Step Diagnostic Procedure
-
Inspect vanity mirror bulb
-
Test visor mirror open switch
-
Check wiring through visor pivot
-
Scan BCM for vanity light codes
Frequently Asked Questions
How does the vanity light turn on?
A small switch detects when the mirror cover is opened.
Can I replace the vanity light bulb?
On some vehicles the bulb is replaceable; on others the entire visor must be replaced.
Does it drain the battery?
If the visor switch sticks, the light can stay on and contribute to drain.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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