Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Nissan 370Z. However, it is still accessible from the selected car via links, so may be relevant.

CHECK INPUT 1 - 5 SYSTEM CIRCUIT FOR OPEN

Turn the ignition switch OFF.
Disconnect the BCM and combination switch connectors.

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	M122	107	M33	11	Existed
INPUT 2		109		9
INPUT 3		88		7
INPUT 4		108		10
INPUT 5		87		13

Does continuity exist?

YES: Go to 2.

NO: Repair the harnesses or connectors.

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	M122	107		Not existed
INPUT 2		109
INPUT 3		88
INPUT 4		108
INPUT 5		87

Does continuity exist?

YES: Repair the harnesses or connectors.

NO: Go to 3.

CHECK BCM OUTPUT VOLTAGE

Connect the BCM connector.

Check voltage between BCM harness connector and ground.

VOLTAGE SPECIFICATION

System	Terminals			Voltage (Approx.)
	(+)		(-)
	BCM		Ground
	Connector	Terminal
INPUT 1	M122	107		Refer to "REFERENCE VALUE ".
INPUT 2		109
INPUT 3		88
INPUT 4		108
INPUT 5		87

Is the measurement value normal?

YES: Go to 4.

NO: Replace BCM. Refer to "EXPLODED VIEW ".

CHECK BCM INPUT SIGNAL

Connect the combination switch connector.
Turn ON any switch in the system that is malfunctioning.

Check voltage between BCM harness connector and ground.

VOLTAGE SPECIFICATION

System	Terminals			Voltage (Approx.)
	(+)		(-)
	BCM		Ground
	Connector	Terminal
INPUT 1	M122	107		Refer to "REFERENCE VALUE ".
INPUT 2		109
INPUT 3		88
INPUT 4		108
INPUT 5		87

Is the measurement value normal when any of the switches is turned ON?

YES: Replace BCM. Refer to "EXPLODED VIEW ".

NO: Replace the combination switch.