Nissan Sentra B18 (2020-2025) Service Manual / Body Interior / Seat :: Dtc/circuit Diagnosis / B24b0-14 Front Heated Seat Relay Lh (hi)

Nissan Sentra B18 (2020-2025) Service Manual: B24b0-14 Front Heated Seat Relay Lh (hi)

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis name)	DTC detection condition
B24B0-14	Front heated seat relay LH (HI) [Front heated seat relay left hand (high)]	Diagnosis	Heated seat switch LH (HIGH) is OFF
		Signal (terminal)	Heated seat LH high relay control signal
		Threshold	Less than 2.5 V
		Diagnosis delay time	1 second or more

POSSIBLE CAUSE

Harness, fuse, or connectors
Heated seat LH high relay
A/C auto amp. (with auto A/C)
A/C amp. (with manual A/C)

FAIL-SAFE

—

Dtc Confirmation Procedure

DTC Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE
1. CONSULT
  1. Ignition switch ON.
  2. Turn heated seat switch LH (HIGH) ON.
  3. Select “Self Diagnostic Result” mode of “HVAC”.
Is B24B0-14 detected?
YES >>
Refer to DTC Diagnosis Procedure.
NO >>
To check malfunction symptom before repair: Refer to Intermittent Incident.
NO >>
Confirmation after repair: Inspection End.

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

CHECK FUSE

Ignition switch OFF.

Check that the following fuse is not blown (open):

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

Is the inspection result normal?

YES >>

GO TO 2

NO >>

Replace the blown fuse after repairing the affected circuit.

CHECK HEATED SEAT LH HIGH RELAY POWER SUPPLY

Disconnect heated seat LH high relay connector.
Ignition switch ON.

Check voltage between heated seat LH high relay harness connector and ground.

(+)	(-)	Voltage (Approx.)
M150	1	Ground	Battery voltage

(+)

(-)

Voltage

(Approx.)

Heated seat LH high relay

Connector

Terminal

M150

Ground

Battery voltage

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

Repair or replace harness.

CHECK HEATED SEAT LH HIGH RELAY
1. Check heated seat LH high relay.
  
  Refer to Component Inspection.
Is the inspection result normal?
YES >>
GO TO 4.
NO >>
Replace heated seat LH high relay.

CHECK HEATED SEAT LH HIGH RELAY CONTROL SIGNAL

Connect heated seat LH high relay connector.

Check voltage 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
(+)		(–)	Condition		Voltage (Approx.)
A/C auto amp.
Connector	Terminal
M34	55	Ground	Heated seat switch LH (HIGH)	OFF	Battery voltage
M34	55	Ground	Heated seat switch LH (HIGH)	ON	0 V

With manual A/C
(+)		(–)	Condition		Voltage (Approx.)
A/C amp.
Connector	Terminal
M82	55	Ground	Heated seat switch LH (HIGH)	OFF	Battery voltage
M82	55	Ground	Heated seat switch LH (HIGH)	ON	0 V

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 >>

GO TO 5.

CHECK HEATED SEAT LH HIGH 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) and heated seat LH high relay connector.

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

With auto A/C
A/C auto amp.		Heated seat LH high relay		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M34	55	M150	2	Yes

With manual A/C
A/C amp.		Heated seat LH high relay		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M82	55	M150	2	Yes

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

With auto A/C
A/C auto amp.		(–)	Continuity
Connector	Terminal	(–)	Continuity
M34	55	Ground	No

With manual A/C
A/C amp.		(–)	Continuity
Connector	Terminal	(–)	Continuity
M82	55	Ground	No

Is the inspection result normal?

YES >>

GO TO 6.

NO >>

Repair or replace harness.

CHECK INTERMITTENT INCIDENT
1. Check intermittent incident.
  
  Refer to Intermittent Incident.
>>
Inspection End.

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