Diagnosis Procedure

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
  - CAN gateway (Models without ICC system)
  Is the inspection result normal?
  
  YES-1: Models without ICC system: GO TO 2.
  
  YES-2: Models with ICC system: GO TO 3.
  
  NO: Repair the terminal and connector.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Disconnect the connector of CAN gateway.

Check the continuity between the CAN gateway harness connector terminals.

CAN gateway harness connector			Continuity
Connector No.	Terminal No.		Continuity
M5	4	6	Existed
M5	10	12	Existed

Is the inspection result normal?

YES: GO TO 3.

NO: Check the harness and repair the root cause (CAN communication circuit 2 side).

CHECK HARNESS FOR OPEN CIRCUIT

Connect the connector of CAN gateway. (Models without ICC system)
Disconnect the connector of sonar control unit.

Check the resistance between the sonar control unit harness connector terminals.

Sonar control unit harness connector			Resistance (Ω)
Connector No.	Terminal No.		Resistance (Ω)
M70	5	6	Approx. 54 - 66

Is the measurement value within the specification?

YES: GO TO 4.

NO: Replace the main harness.

CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the sonar control unit. Refer to the following.
- BOSE audio with navigation system without surround sound system: "SONAR CONTROL UNIT (WITH AROUND VIEW MONITOR): DIAGNOSIS PROCEDURE "
- BOSE audio with navigation system with surround sound system: "SONAR CONTROL UNIT (WITH AROUND VIEW MONITOR): DIAGNOSIS PROCEDURE "
  Is the inspection result normal?
  
  YES (Present error): Replace the sonar control unit. Refer to the following.
  - BOSE audio with navigation system without surround sound system: "REMOVAL AND INSTALLATION "
  - BOSE audio with navigation system with surround sound system: "REMOVAL AND INSTALLATION "
  YES (Past error): Error was detected in the sonar control unit branch line.
  
  NO: Repair the power supply and the ground circuit.