Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to WIRING DIAGRAM .

CHECK POWER SUPPLY CIRCUIT - 1

Check voltage between pre-crash seat belt control unit (driver side and passenger side) harness connector and ground.

Pre-crash seat belt control unit		Ground	Voltage (Approx.)
Connector	Terminal
B58 (Driver side)	1		Battery voltage
B160 (Passenger side)

Is the inspection result normal?

YES

GO TO 3

GO TO 2

CHECK POWER SUPPLY CIRCUIT - 2

Disconnect fuse block (J/B) harness connector.

Check continuity between pre-crash seat belt control unit (driver side and passenger side) harness connector and fuse block (J/B) harness connector.

Pre-crash seat belt control unit		Fuse block (J/B)		Continuity
Connector	Terminal	Connector	Terminal
B58 (Driver side)	1	M68	3R	Yes
B160 (Passenger side)

Check continuity between pre-crash seat belt control unit (driver side and passenger side) harness connector and ground.

Pre-crash seat belt control unit		Ground	Continuity
Connector	Terminal
B58 (Driver side)	1		No
B160 (Passenger side)

Is the inspection result normal?

YES

GO TO 3

Repair harness or connector.

CHECK GROUND CIRCUIT

Turn ignition switch OFF.
Disconnect pre-crash seat belt control unit (driver side and passenger side) harness connector.

Check continuity between pre-crash seat belt control unit (driver side and passenger side) harness connector and ground.

Pre-crash seat belt control unit		Ground	Continuity
Connector	Terminal
B58 (Driver side)	18		Yes
	20
B160 (Passenger side)	18
	20

Is the inspection result normal?

YES

Inspection End.

Repair harness or connector.