B1303 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1303 – Accessory Delay Relay Coil Circuit Open


B1303 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


B1303 Possible Causes


Faulty Accessory Delay Relay,Accessory Delay Relay harness is open or shorted,Accessory Delay Relay circuit poor electrical connection,Faulty Smart Junction Box (SJB)


B1303 Description


The accessory delay relay receives voltage at all times from the Smart Junction Box (SJB). The SJB controls the coil side ground of the accessory delay relay and activates the accessory delay relay when the ignition switch is in the ON position. The accessory delay relay remains active for an additional 10 minutes when the ignition switch is in the OFF position or until the driver door is opened. The accessory delay relay provides voltage to the door lock switches, power windows and roof opening panel (if equipped).