Diagnosis Procedure

WARNING: This page is about a different car, the 2008 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK INPUT 1 - 5 SYSTEM CIRCUIT FOR OPEN

Turn ignition switch OFF.
Disconnect BCM and combination switch.

Check continuity between BCM harness connector and combination switch harness connector.

CONTINUITY SPECIFICATION

System	BCM		Combination switch		Continuity
System	Connector	Terminal	Connector	Terminal	Continuity
INPUT 1	M18 (A)	6	M28 (B)	6	Yes
INPUT 2		5		7
INPUT 3		4		10
INPUT 4		3		9
INPUT 5		2		8

Fig 1: Identifying Continuity Between BCM Harness Connector And Combination Switch Harness Connector

Courtesy of NISSAN MOTOR CO., U.S.A.

Does continuity exist?

YES: GO TO 2

NO: Repair or replace harness.

CHECK INPUT 1 - 5 SYSTEM CIRCUIT FOR SHORT

Check for continuity between BCM harness connector and ground.

CONTINUITY SPECIFICATION

System	BCM		Ground	Continuity
	Connector	Terminal
INPUT 1	M18	6		No
INPUT 2		5
INPUT 3		4
INPUT 4		3
INPUT 5		2

Fig 2: Identifying Continuity Between BCM Harness Connector And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

Does continuity exist?

YES: Repair or replace harness.

NO: GO TO 3

CHECK BCM OUTPUT VOLTAGE

Connect BCM.
Turn ignition switch ON.

Check voltage between BCM harness connector and ground.

VOLTAGE SPECIFICATION

System	Terminals			Voltage (Approx.)
	(+)		(-)
	BCM		Ground
	Connector	Terminal
INPUT 1	M18	6		Refer to "REFERENCE VALUE ".
INPUT 2		5
INPUT 3		4
INPUT 4		3
INPUT 5		2

Fig 3: Identifying Voltage Between BCM Harness Connector And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

Is the measurement value normal?

YES: GO TO 4

NO: Replace BCM. Refer to "REMOVAL AND INSTALLATION ".

CHECK COMBINATION SWITCH
Check combination switch. Refer to "DESCRIPTION ".

Is the check result normal?

YES: Replace BCM. Refer to "REMOVAL AND INSTALLATION ".

NO: Replace the combination switch (applicable parts). Refer to "REMOVAL AND INSTALLATION ".