B1685 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1685 – Lamp Dome Input Circuit Failure


B1685 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


B1685 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)


B1685 Description


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.