B1688

Lamp Dome Input Circuit Short To Ground

Severity

✅ Low

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$11–56 (est.)

Symptoms

Dome light not working
Check Engine Light Is On
Error B1688 in ECU memory

Causes

Open or short circuit in wiring harness
Dome light switch malfunction
Short circuit to ground
Body Control Module (BCM) Malfunction

How to Fix

Check wiring harness for damage
Check dome light switch
Check the circuit for short circuit to ground
Check the performance of the body control module (BCM)

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