Rear Left Map Light Circuit Malfunction
The B0157 code means the vehicle's onboard diagnostic system has detected: Rear Left Map Light Circuit Malfunction. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $5 - $120 (parts and labor)
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Common Symptoms
- Map light not illuminating
- Map light does not respond to switch
- Dim or flickering map light
- Map light switch feels loose
Probable Causes (Ranked by Likelihood)
- Burned out map light bulb Very High
- Failed map light switch High
- Corroded map light socket Moderate
- Wiring fault in overhead console Low
Step-by-Step Diagnostic Procedure
-
Inspect map light bulb for failure
-
Test map light switch continuity
-
Check socket for corrosion
-
Inspect wiring in overhead console
Frequently Asked Questions
Are map lights the same as dome lights?
No, map lights are individual reading lights while the dome light illuminates the entire cabin.
Can I replace the switch myself?
Yes, most switches can be pried out of the overhead console and replaced easily.
Do LED map lights get hot?
Quality LED map lights generate much less heat than incandescent bulbs.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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