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

Nissan Sentra B18 (2020-2025) Service Manual: Seat Heater Lh (back)

Component Function Check

CHECK FUNCTION
1. Check that the seat heater LH (back) warms to the preset temperature when operating the heated seat switch LH to HIGH and LOW.
Is the inspection result normal?
YES>>
Seat heater LH (back) function is OK.
NO>>
Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK CUSHION HEATER LH
1. Check cushion heater LH.
  
  Refer to Component Function Check.
Is the inspection result normal?
YES>>
GO TO 2.
NO>>
Refer to Diagnosis Procedure.

CHECK SEAT HEATER LH (BACK) POWER SUPPLY

Disconnect seat heater LH (back) connector.
Ignition switch ON.

Check voltage between seat heater LH (back) harness connector and ground.

With power seat
(+)		(–)	Condition		Voltage (Approx.)
Seat heater LH (back)
Connector	Terminal
B238	2	Ground	Heated seat switch LH (HIGH)	ON	Battery voltage
			Heated seat switch LH (HIGH)	Other than above	0 V
			Heated seat switch LH (LOW)	ON	Battery voltage
			Heated seat switch LH (LOW)	Other than above	0 V

With manual seat
(+)		(–)	Condition		Voltage (Approx.)
Seat heater LH (back)
Connector	Terminal
B230	1	Ground	Heated seat switch LH (HIGH)	ON	Battery voltage
			Heated seat switch LH (HIGH)	Other than above	0 V
			Heated seat switch LH (LOW)	ON	Battery voltage
			Heated seat switch LH (LOW)	Other than above	0 V

Is the inspection result normal?

YES>>

GO TO 4.

NO (with power seat)>>

GO TO 3.

NO (with manual seat)>>

Replace front seat heater LH. Refer to Exploded View.

CHECK SEAT HEATER LH (BACK) CIRCUIT

Turn heated seat switch OFF.
Ignition switch OFF.
Disconnect front seat cushion heater LH connector.

Check continuity between seat heater LH (back) harness connector and front seat cushion heater LH harness connector.

Seat heater LH (back)		Front seat cushion heater LH		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B238	2	B216	4	Yes

Check continuity between seat heater LH (back) harness connector and ground.

Seat heater LH (back)		—	Continuity
Connector	Terminal	—	Continuity
B238	2	Ground	No

Is the inspection result normal?

YES>>

Replace front seat cushion heater LH. Refer to Exploded View.

NO>>

Repair or replace harness.

CHECK SEAT HEATER LH (BACK) GROUND CIRCUIT

Turn heated seat switch OFF.
Ignition switch OFF.

Check continuity between seat heater LH (back) harness connector and ground.

With power seat
Seat heater LH (back)		(–)	Continuity
Connector	Terminal	(–)	Continuity
B238	1	Ground	Yes

With manual seat
Seat heater LH (back)		(–)	Continuity
Connector	Terminal	(–)	Continuity
B230	2	Ground	Yes

Is the inspection result normal?

YES >>

Replace seat heater LH (back). Refer to Exploded View.

NO >>

Repair or replace harness.

 Cushion Heater Rh

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

 Seat Heater Rh (back)

Component Function Check Component Function Check CHECK FUNCTION Check that the seat heater RH (back) warms to the preset temperature when operating the heated seat switch RH to...

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