Upper Dome Light Circuit Malfunction
The B0198 code means the vehicle's onboard diagnostic system has detected: Upper Dome Light Circuit Malfunction. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $10 - $150 (parts and labor)
Basic scanners skip body codes entirely. BlueDriver reads airbag, HVAC, lighting, and BCM codes through your phone.
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Common Symptoms
- Dome light not illuminating
- Interior dark when doors open
- Dome light stays on continuously
- Dome light flickers intermittently
Probable Causes (Ranked by Likelihood)
- Failed dome light switch or timer Very High
- Corroded dome light socket or bulb High
- Faulty door jamb switch input Moderate
- BCM interior light control fault Low
Step-by-Step Diagnostic Procedure
-
Inspect dome light bulb and socket
-
Test door jamb switches
-
Check BCM dome light timer settings
-
Verify wiring from BCM to dome light
Frequently Asked Questions
What causes the dome light to stay on?
Usually a stuck or misaligned door jamb switch making the BCM think a door is open.
Can a dome light drain the battery?
Yes, if left on due to a faulty switch or timer, it can drain the battery overnight.
Can I replace with LED?
Yes, LED dome light replacements provide brighter, longer-lasting illumination.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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