Nissan Sentra B18 (2020-2025) Service Manual: Dtc Diagnosis Procedure
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CHECK FUSE
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Ignition switch OFF.
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Check that the following fuse is not blown (open):
Signal name
Fuse No.
Capacity
Ignition switch ON power supply
6
10 A
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Is the inspection result normal?
YES >>GO TO 2
NO >>Replace the blown fuse after repairing the affected circuit.
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CHECK HEATED SEAT RH LOW RELAY POWER SUPPLY
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Disconnect heated seat RH low relay connector.
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Ignition switch ON.
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Check voltage between heated seat RH low relay harness connector and ground.
(+)
(-)
Voltage
(Approx.)
Heated seat RH low relay
Connector
Terminal
M147
1
Ground
Battery voltage
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Is the inspection result normal?
YES >>GO TO 3.
NO >>Repair or replace harness.
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CHECK HEATED SEAT RH LOW RELAY
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Check heated seat RH low relay.
Refer to Component Inspection.
Is the inspection result normal?
YES >>GO TO 4.
NO >>Replace heated seat RH low relay.
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CHECK HEATED SEAT RH LOW RELAY CONTROL SIGNAL
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Connect heated seat RH low relay connector.
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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
76
Ground
Heated seat switch RH (LOW)
OFF
Battery voltage
ON
0 V
With manual A/C (+)
(–)
Condition
Voltage
(Approx.)
A/C amp.
Connector
Terminal
M82
76
Ground
Heated seat switch RH (LOW)
OFF
Battery voltage
ON
0 V
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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.
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CHECK HEATED SEAT RH LOW RELAY CONTROL SIGNAL CIRCUIT
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Ignition switch OFF.
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Disconnect A/C auto amp. connector (with auto A/C) or A/C. amp. connector (with manual A/C) and heated seat RH low relay connector.
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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 RH low relay harness connector.
With auto A/C A/C auto amp.
Heated seat RH low relay
Continuity
Connector
Terminal
Connector
Terminal
M34
76
M147
2
Yes
With manual A/C A/C amp.
Heated seat RH low relay
Continuity
Connector
Terminal
Connector
Terminal
M82
76
M147
2
Yes
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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
M34
76
Ground
No
With manual A/C A/C amp.
(–)
Continuity
Connector
Terminal
M82
76
Ground
No
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Is the inspection result normal?
YES >>GO TO 6.
NO >>Repair or replace harness.
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CHECK INTERMITTENT INCIDENT
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Check intermittent incident.
Refer to Intermittent Incident.
Inspection End.
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Dtc Confirmation Procedure
DTC Confirmation
Procedure
PERFORM DTC CONFIRMATION PROCEDURE
CONSULT
Ignition switch ON.
...
Other materials:
Interior room lamp control circuit
Description
Controls each interior room lamp (ground side) by pwm signal.
Note:
Pwm signal control period is approximately 250 hz (in the gradual
brightening/dimming).
Component function check
Caution:
Before performing the diagnosis, check that the following are normal.
Interior room l ...
Push-button ignition switch positions
LOCK (Normal parking position):
The ignition switch can only be locked in this
position.
The ignition switch will be unlocked when it is
pushed to the ACC position while carrying the
Intelligent Key or with the Intelligent Key inserted
in the port.
The ignition switch will lock when any d ...
Parking Brake Release Warning Chime
Parking Brake Release Warning Chime
Parking Brake Release Warning Chime
SYSTEM DIAGRAM
WARNING OPERATION CONDITIONS
If all of the following conditions are
fulfilled:
Operation conditions
...
