B1685

Lamp Dome Input Circuit Failure

Severity

✅ Low

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$6–56 (est.)

Symptoms

The interior light does not work
The lamp does not work correctly (flashes, does not turn off)
Error B1685 in diagnostic memory

Causes

Light circuit fuse blown
Open or short circuit in wiring
Malfunction of the lamp control relay
Problem with the dome light switch
Body control module malfunction

How to Fix

Check the interior lighting fuse
Inspect the wiring for damage
Check the operation of the lamp switch
Test control relay
If necessary, replace the body control module

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