B1686 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1686 – Lamp Dome Input Circuit Open

 

B1686 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B1686 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)

 

B1686 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.