Diagnosis Procedure

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

CHECK CLIMATE CONTROLLED SEAT SWITCH INPUT SIGNAL

Turn ignition switch ON.

Check voltage between climate controlled seat switch LH harness connector M119 and climate controlled seat switch RH harness connector M120 and ground.

(+)			(-)	Condition	Voltage (Approx.)
Climate controlled seat switch				Climate controlled seat switch
Connector		Terminal
LH	M119	8	Ground	HEAT mode	Battery voltage
				OFF	0V
		9		COOL mode	Battery voltage
				OFF	0V
RH	M120	5		HEAT mode	Battery voltage
				OFF	0V
		4		COOL mode	Battery voltage
				OFF	0V

Is the inspection result normal?

YES

GO TO 3 .

GO TO 2 .

CHECK CLIMATE CONTROLLED SEAT SWITCH INDICATOR CIRCUIT

Turn ignition switch OFF.
Disconnect climate controlled seat switch LH harness connector M119 and climate controlled seat switch RH harness connector M120 and climate controlled seat control unit LH connector B229 and climate controlled seat control unit RH connector B304.

Check continuity between climate controlled seat switch LH harness connector M119 and climate controlled seat switch RH harness connector M120 and climate controlled seat control unit LH connector B229 and climate controlled seat control unit RH connector B304.

Climate controlled seat switch			Climate controlled seat control unit		Continuity
Connector		Terminal	Connector	Terminal
LH	M119	9	B229	9	Yes
		8		10
RH	M120	4	B304	9
		5		10

Check continuity between climate controlled seat switch LH harness connector M119 and climate controlled seat switch RH harness connector M120 and ground.

Climate controlled seat switch			(-)	Continuity
Connector		Terminal
LH	M119	9	Ground	No
		8
RH	M120	4
		5

Is the inspection result normal?

YES

Replace climate controlled seat control unit. Refer to Removal and Installation .

Repair or replace harness.

CHECK CLIMATE CONTROLLED SEAT SWITCH GROUND CIRCUIT

Turn ignition switch OFF.
Disconnect climate controlled seat switch LH harness connector M119 and climate controlled seat switch RH harness connector M120.

Check continuity between climate controlled seat switch LH harness connector M119 and climate controlled seat switch RH harness connector M120 and ground.

Climate controlled seat switch			(-)	Continuity
Connector		Terminal
LH	M119	7	Ground	Yes
RH	M120	6

Is the inspection result normal?

YES

Replace climate controlled seat switch. Refer to Removal and Installation .

Repair or replace harness.