C1684 Code: Meaning, Causes, and Symptoms | OBD2 Codes

C1684 – 4WAS Main Control Unit Communication

 

C1684 Possible Symptoms

 

Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)

 

C1684 Possible Causes

 

Faulty 4 Wheel Active Steer (4WAS) Main Control Unit,Faulty 4 Wheel Active Steer (4WAS) Front Control Unit

 

C1684 Description

 

The 4 Wheel Active Steer (4WAS) front control unit and 4WAS main control unit transmit/receive information to/from each other for optimum control of the 4WAS system with the specified 4WAS system line (4WAS communication line) between 4WAS Front Control Unit and 4WAS Main Control Unit.