Diagnostic Test

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 CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the 12V battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side).
  - Electrically-driven intelligent brake unit
  - CAN gateway
  - Harness connector E25
  - Harness connector M40
  - Harness connector M133 and fuse block (J/B) side connector
Is the inspection result normal?

YES

GO TO STEP 2 .

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.
M24	4	6	Existed
	10	12	Existed

Is the inspection result normal?

YES

GO TO STEP 3 .

Check the harness and repair or replace [if shield line or fuse block (J/B) is open] the root cause (CAN communication circuit 2 side).

CHECK HARNESS FOR OPEN CIRCUIT

Connect the connector of CAN gateway.
Disconnect the connector of electrically-driven intelligent brake unit.

Check the resistance between the electrically-driven intelligent brake unit harness connector terminals.

Electrically-driven intelligent brake unit harness connector			Resistance (Ω)
Connector No.	Terminal No.
E40	40	39	Approx. 54 - 66

Is the measurement value within the specification?

YES

GO TO STEP 4 .

GO TO STEP 5 .

CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the electrically-driven intelligent brake unit. Refer to DIAGNOSIS PROCEDURE .

Is the inspection result normal?

YES (Present error)

Replace the electrically-driven intelligent brake unit. Refer to REMOVAL AND INSTALLATION .

YES (Past error)

Error was detected in the electrically-driven intelligent brake unit branch line.

NO

Repair the power supply and the ground circuit.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Disconnect the fuse block (J/B) harness connector M133.

Check the continuity between the electrically-driven intelligent brake unit harness connector and the fuse block (J/B) harness connector.

Electrically-driven intelligent brake unit harness connector		Fuse block (J/B) harness connector		Continuity
Connector No.	Terminal No.	Connector No.	Terminal No.
E40	40	M133	12C	Existed
	39		1C	Existed

Is the inspection result normal?

YES

Replace the fuse block (J/B).

Repair the harness between the electrically-driven intelligent brake unit harness connector E40 and the fuse block (J/B) harness connector M133.