Nissan Sentra B18 (2020-2025) Service Manual: Diagnosis Procedure

Nissan Sentra B18 (2020-2025) Service Manual / Body Interior / Seat :: Dtc/circuit Diagnosis / Cushion Heater Lh / Diagnosis Procedure

Diagnosis Procedure

CHECK CUSHION HEATER LH POWER SUPPLY

Ignition switch ON.

Check voltage between front seat cushion heater LH (with power seat) or front seat heater LH (with manual seat) and ground.

With power seat
(+)		(–)	Condition		Voltage (Approx.)
Front seat cushion heater LH
Connector	Terminal
B216	3	Ground	Heated seat switch LH (HIGH)	ON	Battery voltage
	3		Heated seat switch LH (HIGH)	Other than above	0 V
	2		Heated seat switch LH (LOW)	ON	Battery voltage
	2		Heated seat switch LH (LOW)	Other than above	0 V

With manual seat
(+)		(–)	Condition		Voltage (Approx.)
Front seat heater LH
Connector	Terminal
B16	3	Ground	Heated seat switch LH (HIGH)	ON	Battery voltage
	3		Heated seat switch LH (HIGH)	Other than above	0 V
	4		Heated seat switch LH (LOW)	ON	Battery voltage
	4		Heated seat switch LH (LOW)	Other than above	0 V

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

GO TO 2.

CHECK CUSHION HEATER LH CIRCUIT

Turn heated seat switch OFF.
Ignition switch OFF.
Disconnect front seat cushion heater LH connector (with power seat), front seat heater LH connector (with manual seat), heated seat LH low relay connector and heated seat LH high relay connector.

Check continuity between front seat cushion heater LH harness connector (with power seat), front seat heater LH harness connector (with manual seat), heated seat LH low relay harness connector and heated seat LH high relay harness connector.

With power seat
Front seat cushion heater LH		Heated seat LH relay			Continuity
Connector	Terminal	Connector		Terminal	Continuity
B216	3	High	M150	3	Yes
B216	2	Low	M6	3	Yes

With manual seat
Front seat heater LH		Heated seat LH relay			Continuity
Connector	Terminal	Connector		Terminal	Continuity
B16	3	High	M150	3	Yes
B16	4	Low	M6	3	Yes

Check continuity between front seat cushion heater LH harness connector (with power seat) or front seat heater LH harness connector (with manual seat) and ground.

With power seat
Front seat cushion heater LH		(–)	Continuity
Connector	Terminal	(–)	Continuity
B216	3	Ground	No
B216	2	Ground	No

With manual seat
Front seat heater LH		(–)	Continuity
Connector	Terminal	(–)	Continuity
B16	3	Ground	No
B16	4	Ground	No

Is the inspection result normal?

YES >>

Replace corresponding heated seat LH relay.

NO >>

Repair or replace harness.

CHECK CUSHION HEATER LH GROUND CIRCUIT

Ignition switch OFF.
Disconnect front seat cushion heater LH connector (with power seat) or front seat heater LH connector (with manual seat).

Check continuity between front seat cushion heater LH harness connector (with power seat) or front seat heater LH harness connector (with manual seat) and ground.

With power seat
Front seat cushion heater LH		(–)	Continuity
Connector	Terminal	(–)	Continuity
B216	1	Ground	Yes

With manual seat
Front seat heater LH		(–)	Continuity
Connector	Terminal	(–)	Continuity
B16	6	Ground	Yes

Is the inspection result normal?

YES>>

Replace front seat cushion heater LH (with power seat) or front seat heater LH (with manual seat). Refer to Exploded View.

NO>>

Repair or replace harness.

Component Function Check

Component Function Check CHECK FUNCTION Check that cushion heater LH warms to the preset temperature when operating the heated seat switch LH to ...

Cushion Heater Rh

...

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