Diagnosis Procedure

1.CONNECTOR INSPECTION

Turn the ignition switch OFF.
Disconnect the battery cable from the negative terminal.
Disconnect all the unit connectors on IT CAN communication circuit.
Check the terminals and connectors on IT CAN communication circuit for damage, bend and loose connection (unit side and connector side).

Is the inspection result normal?

Repair the terminal and connector.

2.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Disconnect the connector of 8CH CAN gateway.
Check the continuity between the 8CH CAN gateway harness connector terminals.
8CH CAN gateway harness connector Continuity
Connector No. Terminal No.
M16 22 19 Existed
23 20 Existed

Is the inspection result normal?

Check the harness and repair or replace the root cause.

3.CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the 8CH CAN gateway harness connector terminals.

8CH CAN gateway harness connector			Continuity
Connector No.	Terminal No.
M16	22	23	Not existed

Is the inspection result normal?

Check the harness and repair the root cause.

4.CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the 8CH CAN gateway and the ground.

8CH CAN gateway harness connector		Ground	Continuity
Connector No.	Terminal No.
M16	22		Not existed
	23		Not existed

Is the inspection result normal?

Check the harness and repair the root cause.

5.CHECK 8CH CAN GATEWAY TERMINATION CIRCUIT

Remove the 8CH CAN gateway.
Check the resistance between the 8CH CAN gateway terminals.
8CH CAN gateway Resistance (Ω)
Terminal No.
22 23 Approx. 108 – 132
19 20 Approx. 108 – 132

Is the measurement value within the specification?

6.CHECK SYMPTOM

Connect all the connectors. Check if the symptoms described in the “Symptom (Results from interview with customer)” are reproduced.

Inspection result

: Start the diagnosis again. Follow the trouble diagnosis procedure when past error is detected.

7.CHECK UNIT REPRODUCTION

Perform the reproduction test as per the following procedure for each unit.

Turn the ignition switch OFF.
Disconnect the battery cable from the negative terminal.
Disconnect one of the unit connectors of IT CAN communication circuit.
note
8CH CAN gateway has two termination circuits. Check other units first.
Connect the battery cable to the negative terminal. Check if the symptoms described in the “Symptom (Results from interview with customer)” are reproduced.
note Although unit-related error symptoms occur, do not confuse them with other symptoms.

Inspection result

: Connect the connector. Check other units as per the above procedure.

: Replace the unit whose connector was disconnected.

8.CHECK NAVIGATION SYSTEM OPERATION

Turn the ignition switch ON.
Check navigation system operation.
note Navigation system is not applied: Replace the 8CH CAN gateway.

Is the inspection result normal?

INSPECTION END

Replace the 8CH CAN gateway.