B1688 Code: Meaning, Causes, and Symptoms | OBD2 Codes
B1688 – Lamp Dome Input Circuit Short To Ground
B1688 Possible Symptoms
Engine Light ON (or Service Engine Soon Warning Light)
B1688 Possible Causes
Faulty Lamp Dome Switch,Lamp Dome Switch harness is open or shorted,Lamp Dome Switch circuit poor electrical connection,Faulty Body Control Module (BCM)
The Body Control Module (BCM) monitors the Lamp Dome Switch. The BCM sets the OBDII code when the Lamp Dome Switch is not to factory specifications.