Diagnosis Procedure (With Front And Rear Sonar System)

POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure (With Front and Rear Sonar System)


INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT


1. CHECK FUSES

Check for blown sonar system fuses.





Are any fuses blown?
YES- If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Circuit Inspection.
NO- GO TO 2.

2. CHECK POWER SUPPLY CIRCUIT

1.Disconnect sonar control unit connector B56.
2.Turn ignition switch ON.





3.Check voltage between sonar control unit connector B56 terminal 1 and ground.





Is there battery voltage?
YES- GO TO 3.
NO- Check harness for open between sonar control unit and fuse.

3. CHECK GROUND CIRCUIT

1.Turn ignition switch OFF.





2.Check continuity between sonar control unit B56 terminal 4 and ground.





Is there continuity?
YES- Inspection End.
NO- Check harness ground circuit.