Interior Light Control Circuit Failure
There’s a failure in the circuit controlling the interior light system.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The interior light system isn't getting proper signals from the control circuit, which means the lights might stay on or not come on at all.
What the computer is actually seeing
The control module sees an open or short circuit in the interior light control system, impacting how the lights operate when you open the doors or press switches.
What a healthy reading looks like
Voltage should be between 0.2V (off) and 12.0V (on), with a valid ground connection.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the interior light bulb for functionality; replace if burned out. Decision: If bulb is good, go to step 2.
- 22. Inspect wiring and connectors for damage or corrosion. Decision: If wiring is good, go to step 3.
- 33. Test the interior light switch for continuity; it should read near 0 ohms when activated. Decision: If it's faulty, replace the switch; if good, go to step 4.
- 44. Check the voltage at the control module connector while operating the switch (expect 12V). Decision: If no voltage, the control module may need replacement.
Common causes
- Frayed wiring or corroded connectors
- Faulty interior light switch
- Failed control module
Typical repair cost
$100-$300
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, it’s drivable; just the interior lights may not function properly.
Will this code come back after I fix it?
If the underlying issue is resolved, it shouldn't come back.
Why does this code sometimes appear with others?
It can pair with other lighting control codes, indicating broader wiring or module issues.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →