Basic Inspection 3: RAS Control Unit Power Supply Circuit And Ground Circuit Inspection

Turn ignition switch OFF, disconnect RAS control unit harness connector, and check terminal for deformation, disconnection, looseness, etc.

OK or NG 

OK: GO TO 2.

NG: Poor connection of connector terminal. Repair or replace the terminal.

1. Disconnect RAS control unit harness connector B476, and then check continuity between RAS control unit harness connector B476 and ground.

   Terminal 34 - Ground : Continuity should exit. 

OK or NG 

OK: GO TO 3.

NG: Ground circuit open or shorted. Repair or replace any inoperative parts.

Fig 1: Checking Continuity Between RAS Control Unit Harness Connector B476 And Ground

Turn ignition switch ON, and then check voltage between RAS control unit harness connector B476 and ground.

Terminal 27 - Ground : Battery voltage (Approx. 12 V) 

OK or NG 

OK: Power supply and ground circuit are normal.

NG: Power supply circuit open or shorted. Repair or replace any inoperative parts.

Fig 2: Checking RAS Control Unit Power Supply