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 PRE-CRASH SEAT BELT CONTROL UNIT INPUT SIGNAL

Turn ignition switch ON.
Select BRK PEDAL SNSR1 and BRK PEDAL SNSR2 in DATA MONITOR mode with CONSULT.

Check BRK PEDAL SNSR1 and BRK PEDAL SNSR2 indication under the following conditions.

Monitor item

Condition

Voltage (V)

(Approx.)

BRK PEDAL SNSR1

Brake released --> depressed

1 --> 4

BRK PEDAL SNSR2

4 --> 1

Is the inspection result normal?

YES

GO TO 6.

GO TO 2.

CHECK BRAKE PEDAL STROKE SENSOR POWER SUPPLY

Turn ignition switch OFF.
Disconnect brake pedal stroke sensor harness connector.

Check voltage between brake pedal stroke sensor harness connector and ground.

Brake pedal stroke sensor

Ground

Voltage (V)

(Approx.)

Connector

Terminal

E51

Is the inspection result normal?

YES

GO TO 4.

GO TO 3.

CHECK BRAKE PEDAL STROKE SENSOR POWER SUPPLY CIRCUIT

Disconnect pre-crash seat belt control unit LH harness connector.

Check continuity between pre-crash seat belt control unit LH harness connector and brake pedal stroke sensor harness connector.

Pre-crash seat belt control unit LH		Brake pedal stroke sensor		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B58	10	E51	2	Yes

Check continuity between pre-crash seat belt control unit LH harness connector and ground.

Pre-crash seat belt control unit LH		Ground	Continuity
Connector	Terminal
B58	10		No

Is the inspection result normal?

YES

Replace pre-crash seat belt control unit LH. Refer to Removal and Installation .

Repair or replace harness or connector.

CHECK BRAKE PEDAL STROKE SENSOR CIRCUIT

Disconnect pre-crash seat belt control unit LH harness connector.

Check continuity between pre-crash seat belt control unit LH harness connector and brake pedal stroke sensor harness connector.

Pre-crash seat belt control unit LH		Brake pedal stroke sensor		Continuity
Connector	Terminal	Connector	Terminal
B58	2	E51	1	Yes
	12		3
	17		4

Check continuity between pre-crash seat belt control unit harness connector LH and ground.

Pre-crash seat belt control unit LH		Ground	Continuity
Connector	Terminal
B58	2		No
	12
	17

Is the inspection result normal?

YES

GO TO 5.

Repair or replace harness or connector.

CHECK BRAKE PEDAL STROKE SENSOR
Refer to Component Inspection .

Is the inspection result normal?

YES

GO TO 6.

NO

Replace brake pedal stroke sensor. Refer to Removal and Installation .
CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident .

Inspection End.