Interior Lighting Control Circuit Low
The interior lighting control circuit is detecting a low signal voltage.
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 system that controls the lights inside the car is seeing a weaker-than-normal signal, meaning lights might not work as expected.
What the computer is actually seeing
The Body Control Module (BCM) is programmed to see a voltage between 10-14 volts when the circuit is operating correctly; seeing below 9 volts indicates a fault like B2690.
What a healthy reading looks like
Expected voltage on the control circuit should be between 10-14 volts with the system active.
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 fuse for interior lights; if blown, replace the fuse and retest.
- 22. Inspect wiring and connectors related to the interior lighting circuit for damage or corrosion. Repair as needed and retest.
- 33. With the key in the ON position, use a multimeter to measure voltage on the interior lighting control circuit; should read 10-14 volts. If not, the circuit is faulty.
- 44. If the voltage is correct, check the interior light switch for proper function; bypass the switch to test if lights operate with direct power.
- 55. If all else checks out, the BCM may need diagnostic testing or replacement.
Common causes
- Damaged wiring or connectors in the interior lighting circuit
- Faulty Body Control Module (BCM)
- Failed interior light switch
- Ground connection issues to the BCM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, it's safe to drive, but your interior lights might not function, which can be inconvenient.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, the code will likely return.
Does this code relate to other electrical issues in the vehicle?
It can, especially if there's a broader problem with electrical connections in the interior.
Working a real vehicle right now?
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