Diagnosis Procedure

Regarding Wiring Diagram information, refer to WIRING DIAGRAM .

1. CHECK FUSE
   
   

   Check that the following fuses are not blown.

   Terminal No.	Signal name	Fuse No.
   12	Ignition signal	29 (5A)

   Are the fuses blown?

   YES 

   Replace the blown fuse after repairing the affected circuit.

   NO 

   GO TO STEP 2  .

2. CHECK POWER SUPPLY CIRCUIT
   
   
   1. Turn ignition switch OFF.
   2. Disconnect sonar control unit connector M70.
   3. Check voltage between sonar control unit connector M70 and ground.

      Sonar control unit		Ground	Condition	Voltage (Approx.)
      Connector	Terminal
      M70	12	-	Ignition switch: ON	Battery voltage

   Is the inspection result normal?

   YES 

   GO TO STEP 3  .

   NO 

   Repair or replace harness or connectors.

3. CHECK GROUND CIRCUIT
   
   
   1. Turn ignition switch OFF.
   2. Check continuity between sonar control unit connector M70 and ground.

      Sonar control unit		Ground	Continuity
      Connector	Terminal
      M70	15	-	Yes

   Is the inspection result normal?

   YES 

   Inspection End.

   NO 

   Repair or replace harness or connectors.