Diagnosis Procedure

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CLIMATE CONTROLLED SEAT CONTROL UNIT INPUT SIGNAL

Turn the ignition switch ON.

Check voltage between climate controlled seat control unit harness connector and ground.

(+)			(-)	Condition			Voltage (V) (Approx.)
Climate controlled seat control unit
Connector		Terminal
LH	B201	23	Ground	Climate controlled seat switch (LH)	COOL	HI	2.6 - 4.2
						MID	1.6 - 2.5
						LO	0.8 - 1.5
					OFF		0
		10			HEAT	HI	2.6 - 4.2
						MID	1.6 - 2.5
						LO	0.8 - 1.5
					OFF		0
RH	B301	23		Climate controlled seat switch (RH)	COOL	HI	2.6 - 4.2
						MID	1.6 - 2.5
						LO	0.8 - 1.5
					OFF		0
		10			HEAT	HI	2.6 - 4.2
						MID	1.6 - 2.5
						LO	0.8 - 1.5
					OFF		0

Is the inspection result normal?

YES

Inspection End.

HEAT or COOL mode is malfunctioning. GO TO 2.

HEAT and COOL mode are malfunctioning. GO TO 3.

CHECK CLIMATE CONTROLLED SEAT SWITCH CIRCUIT

Turn the ignition switch OFF.
Disconnect climate controlled seat switch connector and climate controlled seat control unit connector.

Check continuity between climate controlled seat switch harness connector and climate controlled seat control unit harness connector.

Climate controlled seat switch				Climate controlled seat control unit		Continuity
Connector			Terminal	Connector	Terminal
LH	COOL	M203	2	B201	23	Yes
	HEAT		3		10
RH	COOL	M206	2	B301	23
	HEAT		3		10

Check continuity between climate controlled seat switch harness connector and ground.

Climate controlled seat switch				Ground	Continuity
Connector			Terminal
LH	COOL	M203	2		No
	HEAT		3
RH	COOL	M206	2
	HEAT		3

Is the inspection result normal?

YES

GO TO 5.

Repair or replace harness.

CHECK CLIMATE CONTROLLED SEAT SWITCH POWER SUPPLY

Turn the ignition switch OFF.
Disconnect climate controlled seat switch connector.
Turn the ignition switch ON.

Check voltage between climate controlled seat switch harness connector and ground.

(+)			(-)	Voltage (V) (Approx.)
Climate controlled seat switch
Connector		Terminal
LH	M203	1	Ground	Battery voltage
RH	M206

Is the inspection result normal?

YES

GO TO 5.

GO TO 4.

CHECK CLIMATE CONTROLLED SEAT SWITCH POWER SUPPLY CIRCUIT

Turn the ignition switch OFF.
Disconnect climate controlled seat control unit connector.

Check continuity between climate controlled seat switch harness connector and climate controlled seat control unit harness connector.

Climate controlled seat switch			Climate controlled seat control unit		Continuity
Connector		Terminal	Connector	Terminal
LH	M203	1	B201	15	Yes
RH	M206		B301

Check continuity between climate controlled seat switch harness connector and ground.

Climate controlled seat switch			Ground	Continuity
Connector		Terminal
LH	M203	1		No
RH	M206

Is the inspection result normal?

YES

Replace climate controlled seat control unit. Refer to Exploded View .

Repair or replace harness.

CHECK CLIMATE CONTROLLED SEAT SWITCH
Check climate controlled seat switch.

Refer to Component Inspection .

Is the inspection result normal?

YES

Check intermittent incident. Refer to Intermittent Incident .

NO

Replace climate controlled seat switch. Refer to Climate Controlled Switch .