Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK OUTPUT 1 - 5 SYSTEM CIRCUIT FOR OPEN

Turn the ignition switch OFF.
Disconnect BCM connector M21 and combination switch connector M28.

Check continuity between BCM harness connector M21 and combination switch harness connector M28.

Combination switch signal	BCM		Combination switch		Continuity
Combination switch signal	Connector	Terminal	Connector	Terminal	Continuity
OUTPUT 1	M21	14	M28	12	Yes
OUTPUT 2		13		14
OUTPUT 3		12		5
OUTPUT 4		11		2
OUTPUT 5		10		8

Is the inspection result normal?

YES

GO TO 2 .

Repair or replace harness.

CHECK OUTPUT 1 - 5 SYSTEM CIRCUIT FOR SHORT

Check for continuity between BCM harness connector M21 and ground.

Combination switch signal	BCM		Ground	Continuity
	Connector	Terminal
OUTPUT 1	M21	14		No
OUTPUT 2		13
OUTPUT 3		12
OUTPUT 4		11
OUTPUT 5		10

Is the inspection result normal?

YES

GO TO 3 .

Repair or replace harness.

CHECK BCM INPUT VOLTAGE

Connect BCM connector M21 and combination switch connector M28.
Turn ignition switch ON.

Check voltage between BCM harness connector M21 and ground.

Combination switch signal	Terminals			Voltage (Approx.)
	(+)		(-)
	BCM		Ground
	Connector	Terminal
OUTPUT 1	M21	14		Refer to Reference Value .
OUTPUT 2		13
OUTPUT 3		12
OUTPUT 4		11
OUTPUT 5		10

Is the measurement normal?

YES

Replace BCM. Refer to Removal and Installation .

Replace the combination switch. Refer to Removal and Installation .