Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. CHECK SONAR BUZZER SIGNAL CIRCUIT CONTINUITY 
   1. Turn ignition switch OFF.
   2. Disconnect sonar control unit connector and sonar buzzer connector.
   3. Check continuity between sonar control unit connector M70 and sonar buzzer connector B35.

      Sonar control unit		Sonar buzzer		Continuity
      Connector	Terminal	Connector	Terminal
      M70	20	B35	3	Yes

   4. Check continuity between sonar control unit connector M70 and ground.

      Sonar control unit		Ground	Continuity
      Connector	Terminal
      M70	20	-	No

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace harness or connectors.

2. CHECK SONAR BUZZER SIGNAL CIRCUIT SHORT TO BATTERY 
   1. Turn ignition switch ON.
   2. Check voltage between sonar control unit connector M70 and ground.

      Sonar control unit		Ground	Voltage (Approx.)
      Connector	Terminal
      M70	20	-	0V

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair or replace harness or connectors.

3. CHECK SONAR BUZZER SIGNAL CIRCUIT SHORT TO BUZZER POWER 
   1. Turn ignition switch OFF.
   2. Check continuity between sonar control unit connector M70 terminals.

      Sonar control unit connector M70		Continuity
      Terminal	Terminal
      19	20	No

      Is the inspection result normal? 

      YES: Replace sonar buzzer. Refer to "REMOVAL AND INSTALLATION ".

      NO: Repair or replace harness or connectors.