Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti Q50. 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 CAN communication circuit 1 and CAN communication circuit 2 have no malfunction.

Are the CAN communication 1 and CAN communication 2 circuits normal?

YES

GO TO STEP 2 .

NO

Check and repair CAN communication circuit 1 and/or CAN communication circuit 2.

CONNECTOR INSPECTION
1. Turn the ignition switch OFF.
2. Disconnect the 12V battery cable from the negative terminal.
3. Check the terminals and connectors of the ADAS control unit for damage, bend and loose connection (unit side and connector side).
Is the inspection result normal?

YES

GO TO STEP 3 .

NO

Repair the terminal and connector.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Disconnect the following harness connectors.
- ADAS control unit
- ICC sensor
Check the continuity between the ADAS control unit harness connector and the ICC sensor harness connector.

ADAS control unit harness connector		ICC sensor harness connector		Continuity
Connector No.	Terminal No.	Connector No.	Terminal No.
T18	6	E80	3	Existed
	7		6	Existed

Is the inspection result normal?

YES

GO TO STEP 4 .

Replace the body harness.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Disconnect the following harness connectors.
- Side radar LH
- Side radar RH
- Around view monitor control unit
- Accelerator pedal actuator/accelerator pedal position sensor
- Driver assistance buzzer control module
- Sonar control unit
Check the continuity between the ADAS control unit harness connector terminals.

ADAS control unit harness connector			Continuity
Connector No.	Terminal No.
T18	6	7	Not existed

Is the inspection result normal?

YES

GO TO STEP 5 .

Check the harness and repair or replace [if shield line or fuse block (J/B) is short] the root cause.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

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

ADAS control unit harness connector		Ground	Continuity
Connector No.	Terminal No.
T18	6		Not existed
	7		Not existed

Is the inspection result normal?

YES

GO TO STEP 6 .

Check the harness and repair or replace [if shield line or fuse block (J/B) is short] the root cause.

CHECK TERMINATION CIRCUIT

Remove the ADAS control unit and the ICC sensor.

Check the resistance between the ADAS control unit terminals.

ADAS control unit		Resistance (Ω)
Terminal No.
6	7	Approx. 108 - 132

Check the resistance between the ICC sensor terminals.

ICC sensor		Resistance (Ω)
Terminal No.
3	6	Approx. 108 - 132

Is the measurement value within the specification?

YES

GO TO STEP 7 .

Replace the ADAS control unit and/or the ICC sensor.

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 STEP 8 .

Non - reproduced

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 12V battery cable from the negative terminal.
3. Disconnect one of the unit connectors of ITS communication circuit.
  NOTE:
  ADAS control unit and ICC sensor have a termination circuit. Check other units first.
4. Connect the 12V 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.

Non - reproduced

Replace the unit whose connector was disconnected.