Diagnosis Procedure (4WAS Front Control Unit)

1. Turn the ignition switch OFF.
2. Disconnect 4WAS front control unit harness connector.
3. Check the voltage between 4WAS front control unit harness connectors and the ground.
   CONNECTOR TERMINAL VOLTAGE CHART
   
   

   4WAS front control unit		Voltage (Approx.)
   Connector	Terminal
   M41	11 - Ground	Battery voltage
   M42	15 - Ground	0 V

4. Turn the ignition switch ON.
   CAUTION: Never start the engine.
5. Check the voltage between 4WAS front control unit harness connectors and the ground.
   CONNECTOR TERMINAL VOLTAGE CHART
   
   

   4WAS front control unit		Voltage (Approx.)
   Connector	Terminal
   M41	11 - Ground	Battery voltage
   M42	15 - Ground

   Is the inspection result normal? 

   YES: GO TO 2.

   NO: Check the following items. Repair or replace the malfunctioning parts.

   • 40A fusible link (#I) open
     • Short among 40A fusible link (#I) connector, 4WAS front control unit harness connector No. 11 terminal and the ground
   • Open between the battery and 4WAS front control unit harness connector No. 11 terminal
   • 10A fuse (#3) open
     • Short among 10A fuse (#3) connector, 4WAS front control unit harness connector No. 15 terminal and the ground
     • Short among 10A fuse (#3) connector, unified meter and A/C amp No. 53 terminal and the ground
   • Open between the ignition switch and 4WAS front control unit harness connector No. 15 terminal
   • Battery or ignition switch

Check the continuity between 4WAS front control unit harness connector and the ground.

Is the inspection result normal? 

YES: INSPECTION END

NO: Repair or replace the harnesses and connectors.