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Diagnosis Procedure
1.CHECK FUSE
Check that the following fuse is not blown (open).
Power sourceFuse No.Capacity
ACC power supply#4010 A
Is the fuse blown (open)?
Be sure to eliminate cause of malfunction before installing new fuse.
.
 
2.CHECK IGNITION POWER SUPPLY CIRCUIT
  1. Turn ignition switch ON.
  2. Check voltage between sonar control unit harness connector and ground.
    (+)(-)StandardReference value
    Sonar control unit
    ConnectorTerminal
    B2012Ground9.0 - 16.0 VBattery voltage
Is the inspection result normal?
.
Repair or replace sonar control unit power supply harness.
 
3.CHECK GROUND CIRCUIT
  1. Turn ignition switch OFF.
  2. Disconnect sonar control unit connector.
  3. Check continuity between sonar control unit harness connector and ground.
    Sonar control unitGroundContinuity
    ConnectorTerminal
    B2015Existed
Is the inspection result normal?
INSPECTION END
Repair or replace sonar control unit ground harness.