Nissan Sentra B18 (2020-2025) Service Manual: Dtc Diagnosis Procedure
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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
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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 LH LOW RELAY POWER SUPPLY
-
-
Disconnect heated seat LH low relay connector.
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Ignition switch ON.
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Check voltage between heated seat LH low relay harness connector and ground.
(+)
(-)
Voltage
(Approx.)
Heated seat LH low relay
Connector
Terminal
M6
1
Ground
Battery voltage
-
Is the inspection result normal?
YES>>GO TO 3.
NO>>Repair or replace harness.
-
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CHECK HEATED SEAT LH LOW RELAY
-
Check heated seat LH low relay.
Refer to Component Inspection.
Is the inspection result normal?
YES>>GO TO 4.
NO>>Replace heated seat LH low relay.
-
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CHECK HEATED SEAT LH LOW RELAY CONTROL SIGNAL
-
-
Connect heated seat LH 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
75
Ground
Heated seat switch LH (LOW)
OFF
Battery voltage
ON
0 V
With manual A/C (+)
(–)
Condition
Voltage
(Approx.)
A/C amp.
Connector
Terminal
M82
75
Ground
Heated seat switch LH (LOW)
OFF
Battery voltage
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.
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CHECK HEATED SEAT LH LOW 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 low 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 low relay harness connector.
With auto A/C A/C auto amp.
Heated seat LH low relay
Continuity
Connector
Terminal
Connector
Terminal
M34
75
M6
2
Yes
With manual A/C A/C amp.
Heated seat LH low relay
Continuity
Connector
Terminal
Connector
Terminal
M82
75
M6
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
M34
75
Ground
No
With manual A/C A/C amp.
(–)
Continuity
Connector
Terminal
M82
75
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.
...
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