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

Nissan Sentra B18 (2020-2025) Service Manual / Body Interior / Seat :: Dtc/circuit Diagnosis / Heated Seat Rh Relay / Diagnosis Procedure

Diagnosis Procedure

CHECK FUSE

Ignition switch OFF.

Check that any of the following fuses are not blown (open):

Signal name	Fuse No.	Capacity
Ignition switch ON power supply	6	10 A
Battery power supply	22	10 A

Is the inspection result normal?

YES >>

GO TO 2.

NO >>

Replace the blown fuse after repairing the affected circuit.

CHECK HEATED SEAT RH RELAY POWER SUPPLY

Disconnect heated seat RH relay connector.
Ignition switch ON.

Check voltage between heated seat RH relay harness connector and ground.

(+)			(-)	Voltage (Approx.)
Heated seat RH relay
Connector		Terminal
High	M144	1	Ground	Battery voltage
High	M144	5
Low	M147	1
Low	M147	5

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

Repair or replace harness.

CHECK HEATED SEAT RH RELAY CONTROL SIGNAL CIRCUIT

Ignition switch OFF.
Disconnect A/C auto amp. connector (with auto A/C) or A/C amp. connector (with manual A/C).

Check continuity between heated seat RH relay harness connector and A/C auto amp. (with auto A/C) or A/C amp. (with manual A/C) harness connector.

With auto A/C
Heated seat RH relay			A/C auto amp.		Continuity
Connector		Terminal	Connector	Terminal	Continuity
High	M144	2	M34	79	Yes
Low	M147	2	M34	76	Yes

With manual A/C
Heated seat RH relay			A/C amp.		Continuity
Connector		Terminal	Connector	Terminal	Continuity
High	M144	2	M82	79	Yes
Low	M147	2	M82	76	Yes

Check continuity between A/C auto amp. (with auto A/C) or A/C amp. (with manual A/C) harness connector and ground.

With auto A/C
A/C auto amp.		(-)	Continuity
Connector	Terminal	(-)	Continuity
M34	76	Ground	No
M34	79	Ground	No

With manual A/C
A/C amp.		(-)	Continuity
Connector	Terminal	(-)	Continuity
M82	76	Ground	No
M82	79	Ground	No

Is the inspection result normal?

YES >>

GO TO 4.

NO >>

Repair or replace harness.

CHECK HEATED SEAT RH RELAY
1. Check heated seat RH relay.
  
  Refer to Component Inspection.
Is the inspection result normal?
YES>>
Replace A/C auto amp. (with auto A/C) or A/C amp. (with manual A/C). Refer to Removal and Installation (with auto A/C) or Removal and Installation (with manual A/C).
NO>>
Replace corresponding heated seat RH relay.

Component Function Check

Component Function Check CHECK HEATED SEAT RH RELAY FUNCTION Check that seat cushion and seat back warm to the preset temperature when operating ...

Component Inspection

Component Inspection CHECK HEATED SEAT RH RELAY Ignition switch OFF. Disconnect heated seat ...

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