Interior Lighting Control Module Fault
This code indicates a malfunction in the interior lighting control module.
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 lighting control module is responsible for managing the lights inside the vehicle. If something isn't working right, it can't turn the lights on or off as needed, which can leave some lights on all the time or not turn them on when you open the door.
What the computer is actually seeing
The Body Control Module (BCM) expects a certain voltage level from the interior lighting control system. When it doesn't see a proper signal between 0-5 volts while the lights should be on, it triggers this code.
What a healthy reading looks like
BCM expects 12V at the interior lighting circuit when lights are activated; should see below 1V when off.
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.
- 1Inspect wiring harness for signs of damage or corrosion; check connectors for secure fit and corrosion.
- 2Check the fuse for the interior lights; replace if blown.
- 3Use a multimeter to measure voltage at the interior lighting module connector while operating the system. Expected is 12V when activated, 0V when off.
- 4If voltage is correct, replace the interior lighting control module.
Common causes
- Faulty interior lighting control module
- Open or shorted wiring in the lighting circuit
- Bad connector or poor ground connection
- Blown fuse related to interior lighting
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but the interior lights may not function properly which can be a distraction or safety issue at night.
Will this code come back after clearing?
If the underlying issue isn't resolved, the code is likely to return.
What if other electrical components are affected?
Check for shared circuits; this module may affect other systems if there's a wiring issue.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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