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Diagnosis Procedure
1.CHECK CONNECTOR
  1. Turn the ignition switch OFF.
  2. Disconnect the battery cable from the negative terminal.
  3. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side).
    • Sonar control unit
Is the inspection result normal?
.
Repair the terminal and connector.
 
2.CHECK HARNESS FOR OPEN CIRCUIT
  1. Disconnect the connector of sonar control unit.
  2. Check the resistance between the sonar control unit harness connector terminals.
    Sonar control unit harness connectorResistance (Ω)
    Connector No.Terminal No.
    B2056Approx. 54 – 66
Is the measurement value within the specification?
.
Repair the sonar control unit branch line.
 
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the sonar control unit. Refer to Diagnosis Procedure.
Is the inspection result normal?
(Present error)Replace the sonar control unit. Refer to Removal and Installation.
(Past error)Error was detected in the sonar control unit branch line.
Repair the power supply and the ground circuit.