Diagnosis Procedure

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CAN DIAGNOSIS
Check the CAN diagnosis results from CONSULT to see that the vehicle CAN communication circuit and/or ITS CAN communication circuit have no malfunction.

Are the vehicle CAN communication circuit and/or ITS CAN communication circuit normal?

YES

GO TO 2.

NO

Check and repair vehicle CAN communication circuit and/or ITS CAN communication circuit.
CONNECTOR INSPECTION
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Disconnect all the unit connectors on chassis CAN communication circuit.
4. Check the terminals and connectors for damage, bend and loose connection (unit side and connector side).
Is the inspection result normal?

YES

GO TO 3.

NO

Repair the terminal and connector.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Check the continuity between the ADAS control unit 2 harness connector terminals.

ADAS control unit 2 harness connector			Continuity
Connector No.	Terminal No.
M198	18	2	Existed
	6	5	Existed

Is the inspection result normal?

YES

GO TO 4.

Check the harness and repair or replace the root cause.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the ADAS control unit 2 harness connector terminals.

ADAS control unit 2 harness connector			Continuity
Connector No.	Terminal No.
M198	18	6	Not existed

Is the inspection result normal?

YES

GO TO 5.

Check the harness and repair or replace the root cause.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the ADAS control unit 2 harness connector and the ground.

ADAS control unit 2 harness connector		Ground	Continuity
Connector No.	Terminal No.
M198	18		Not existed
	6		Not existed

Is the inspection result normal?

YES

GO TO 6.

Check the harness and repair or replace the root cause.

CHECK ADAS CONTROL UNIT 2 TERMINATION CIRCUIT

Remove the ADAS control unit 2.

Check the resistance between the ADAS control unit 2 terminals.

ADAS control unit 2		Resistance (Ohm)
Terminal No.
18	6	Approx. 108 - 132
2	5	Approx. 108 - 132

Is the measurement value within the specification?

YES

GO TO 7.

Replace the ADAS control unit 2.

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

Inspection result

Reproduced

GO TO 8.

NO

Start the diagnosis again. Follow the trouble diagnosis procedure when past error is detected.
CHECK UNIT REPRODUCTION
Perform the reproduction test as per the following procedure for each unit.
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Disconnect one of the unit connectors of chassis CAN communication circuit.
  NOTE: ADAS control unit 2 has two termination circuits. Check other units first.
4. 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

Reproduced

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

NO

Replace the unit whose connector was disconnected.