Nissan Sentra B18 (2020-2025) Service Manual / Driver Controls / Defogger :: Dtc/circuit Diagnosis

Nissan Sentra B18 (2020-2025) Service Manual: Defogger :: Dtc/circuit Diagnosis

Rear Window Defogger Switch. Component Function Check

Component Function Check

CHECK REAR WINDOW DEFOGGER SWITCH FUNCTION
1. Check that the indicator lamp of rear window defogger illuminates when rear window defogger switch ON.
Is the inspection result normal?
YES>>
Rear window defogger switch function is OK.
NO>>
Refer to Diagnosis Procedure.

Diagnosis Procedure

REPLACE A/C SWITCH ASSEMBLY
1. 1. Ignition switch OFF.
  2. Replace A/C switch assembly (rear window defogger switch). Refer to Removal and Installation (with automatic air conditioner) or Removal and Installation (with manual air conditioner).
  3. Start engine.
  4. Operate rear window defogger switch and check the operating condition.
Is the inspection result normal?
YES>>
Inspection End.
NO>>
With automatic A/C: GO TO 2.
NO>>
With manual A/C: GO TO 3.
REPLACE A/C AUTO AMP.
1. 1. Ignition switch OFF.
  2. Replace A/C auto amp. Refer to Removal and Installation.
  3. Start engine.
  4. Operate rear window defogger switch and check the operating condition.
Is the inspection result normal?
YES >>
Inspection End.
NO >>
Replace BCM. Refer to Removal and Installation.
REPLACE A/C AMP.
1. 1. Ignition switch OFF.
  2. Replace A/C amp. Refer to Removal and Installation.
  3. Start engine.
  4. Operate rear window defogger switch and check the operating condition.
Is the inspection result normal?
YES >>
Inspection End.
NO >>
Replace BCM. Refer to Removal and Installation.

Rear Window Defogger Relay. Component Function Check

Component Function Check

CHECK REAR WINDOW DEFOGGER RELAY CONTROL FUNCTION
1. CONSULT
  1. Ignition switch ON.
  2. Select “REAR DEFOGGER” in “Active Test” mode of "BCM(REAR DEFOGGER)".
  3. Select “On”.
  4. Check that the rear window glass is getting warmer.
    Note:
    When glass is hot, never start inspection until it is cool enough.
Is the inspection result normal?
YES >>
Rear window defogger relay control function is OK.
NO >>
Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK FUSE

Ignition switch OFF.

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

Unit	Location	Fuse No.	Capacity
Rear window defogger relay	Fuse block (J/B)	19	10 A
Rear window defogger relay	Fuse block (J/B)	58	30 A

Is the fuse blown (open)?

YES>>

Replace the blown fuse or fusible link after repairing the affected circuit.

NO>>

GO TO 2.

CHECK REAR WINDOW DEFOGGER RELAY (COIL SIDE) CIRCUIT 1

Disconnect BCM connector.

Check voltage between BCM harness connector and ground.

(+)	(-)	Voltage (Approx.)
M83	63	Ground	Battery voltage

(+)

(-)

Voltage

(Approx.)

BCM

Connector

Terminal

M83

Ground

Battery voltage

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

GO TO 3.

CHECK REAR WINDOW DEFOGGER RELAY (COIL SIDE) CIRCUIT 2

Disconnect rear window defogger relay connector.

Check voltage between fuse block (J/B) harness connector and ground.

(+)	(-)	Voltage (Approx.)
Coil upstream side of rear window defogger relay	Ground	Battery voltage

(+)

(-)

Voltage

(Approx.)

Fuse block (J/B)

Terminal

Coil upstream side of rear window defogger relay

Ground

Battery voltage

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace the malfunctioning parts.

CHECK REAR WINDOW DEFOGGER RELAY (COIL SIDE) CIRCUIT 3

Check continuity between BCM harness connector and fuse block (J/B) harness connector.

BCM		Fuse block (J/B)		Continuity
Connector	Terminal	Terminal		Continuity
M83	63	Coil downstream side of rear window defogger relay		Yes

Is the inspection result normal?

YES>>

GO TO 7.

NO>>

Repair or replace the malfunctioning parts.

CHECK REAR WINDOW DEFOGGER RELAY (SWITCH SIDE) CIRCUIT 1

Disconnect rear window defogger relay.

Check voltage between fuse block (J/B) harness connector and ground.

(+)	(-)	Voltage (Approx.)
Switch upstream side of rear window defogger relay	Ground	Battery voltage

(+)

(-)

Voltage

(Approx.)

Fuse block (J/B)

Terminal

Switch upstream side of rear window defogger relay

Ground

Battery voltage

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Repair or replace the malfunctioning parts.

CHECK REAR WINDOW DEFOGGER RELAY (SWITCH SIDE) CIRCUIT 2

Disconnect Rear window defogger condenser connector..

Check continuity between Rear window defogger condenser harness connector and fuse block (J/B) harness connector.

Rear window defogger condenser		Fuse block (J/B)		Continuity
Connector	Terminal	Terminal		Continuity
B50	1	Switch downstream side of rear window defogger relay		Yes

Is the inspection result normal?

YES>>

GO TO 7.

NO>>

Repair or replace the malfunctioning parts.

CHECK REAR WINDOW DEFOGGER RELAY
1. Check rear window defogger relay. Refer to Component Inspection.
Is the inspection result normal?
YES>>
Inspection End.
NO>>
Replace rear window defogger relay.

Component Inspection

CHECK REAR WINDOW DEFOGGER RELAY

Ignition switch OFF.
Disconnect rear window defogger relay.

Check continuity between rear window defogger relay terminals.

Rear window defogger relay		Condition	Continuity
Terminals		Condition	Continuity
3	5	12 V direct current supply between terminals 1 and 2.	Yes
3	5	No current supply	No

Is the inspection result normal?

YES >>

Inspection End.

NO >>

Replace rear window defogger relay.

Rear Window Defogger Circuit. Component Function Check

Component Function Check

CHECK REAR WINDOW DEFOGGER FUNCTION
1. CONSULT
  1. Ignition switch ON.
  2. Select “REAR DEFOGGER” in “Active Test” mode of "BCM(REAR DEFOGGER)".
  3. Select “On”.
  4. Check that the rear window glass is getting warmer.
    Note:
    When glass is hot, never start inspection until it is cool enough.
Is the inspection result normal?
YES>>
Inspection End.
NO>>
Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK REAR WINDOW DEFOGGER POWER SUPPLY CIRCUIT

Start engine.

Check voltage between rear window defogger harness connector and ground.

(+)		(–)	Condition		Voltage (Approx.)
Rear window defogger
Connector	Terminal
B62	1	Ground	Rear window defogger switch	ON	Battery voltage
B62	1	Ground	Rear window defogger switch	OFF	0 V

Is the inspection result normal?

YES >>

GO TO 2.

NO >>

GO TO 3.

CHECK REAR WINDOW DEFOGGER GROUND CIRCUIT

Ignition switch OFF.
Disconnect rear window defogger connector.

Check continuity between rear window defogger harness connector and ground.

Rear window defogger		—	Continuity
Connector	Terminal	—	Continuity
B63	2	Ground	Yes

Is the inspection result normal?

YES >>

GO TO 6.

NO >>

Repair or replace harness.

CHECK REAR WINDOW DEFOGGER CIRCUIT 1

Ignition switch OFF.
Disconnect rear window defogger condenser connector and rear window defogger connector.

Check continuity between rear window defogger condenser harness connector and rear window defogger harness connector.

Rear window defogger condenser		Rear window defogger		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B50	1	B62	1	Yes

Is the inspection result normal?

YES >>

GO TO 4.

NO >>

Repair or replace harness.

CHECK REAR WINDOW DEFOGGER CIRCUIT 2

Disconnect rear window defogger relay connector.

Check continuity between rear window defogger condenser harness connector and fuse block (J/B) harness connector.

Rear window defogger condenser		Fuse block (J/B)		Continuity
Connector	Terminal	Terminal		Continuity
B50	1	Switch downstream side of rear window defogger relay		Yes

Is the inspection result normal?

YES >>

GO TO 5.

NO >>

Repair or replace the malfunctioning parts.

CHECK REAR WINDOW DEFOGGER CONDENSER
1. 1. Ignition switch OFF.
  2. Check rear window defogger condenser. Refer to Component Inspection.
Is the inspection result normal?
YES>>
Inspection End.
NO>>
Replace rear window defogger condenser. Refer to Removal and Installation.
CHECK FILAMENT
1. Check the filament for damage or blown. Refer to Inspection and Repair.
Is the inspection result normal?
YES >>
Inspection End.
NO >>
Repair filament. Refer to Inspection and Repair.

Component Inspection

CHECK REAR WINDOW DEFOGGER CONDENSER

Ignition switch OFF.
Disconnect rear window defogger condenser connector.

Check continuity between rear window defogger condenser and ground part of rear window defogger condenser.

Rear window defogger condenser	—	Continuity
Terminal	—	Continuity
1	Ground part of rear window defogger condenser	No

Is the inspection result normal?

YES >>

Inspection End.

NO >>

Replace rear window defogger condenser. Refer to Removal and Installation.

Door Mirror Lh Defogger. Component Function Check

Component Function Check

CHECK DOOR MIRROR LH DEFOGGER FUNCTION
1. CONSULT
  1. Ignition switch ON.
  2. Select “REAR DEFOGGER” in “Active Test” mode of "BCM(REAR DEFOGGER)".
  3. Select “On”.
  4. Check that the door mirror LH glass is getting warmer.
    Note:
    When glass is hot, never start inspection until it is cool enough.
Is the inspection result normal?
YES>>
Inspection End.
NO>>
Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK DOOR MIRROR LH POWER SUPPLY CIRCUIT

Ignition switch OFF.
Disconnect door mirror LH connector.
Start engine.

Check voltage between door mirror LH harness connector and ground.

WITH INTELLIGENT AROUND VIEW MONITOR SYSTEM
(+)		(-)	Condition		Voltage (Approx.)
Door mirror LH
Connector	Terminal
D7	6	Ground	Rear window defogger switch	ON	Battery voltage
D7	6	Ground	Rear window defogger switch	OFF	0 V

WITHOUT INTELLIGENT AROUND VIEW MONITOR SYSTEM
(+)		(-)	Condition		Voltage (Approx.)
Door mirror LH
Connector	Terminal
D4	4	Ground	Rear window defogger switch	ON	Battery voltage
D4	4	Ground	Rear window defogger switch	OFF	0 V

Is the inspection result normal?

YES >>

GO TO 2.

NO >>

Repair or replace harness.

CHECK DOOR MIRROR LH GROUND CIRCUIT

Ignition switch OFF.

Check continuity between door mirror LH harness connector and ground.

WITH INTELLIGENT AROUND VIEW MONITOR SYSTEM
Door mirror LH		—	Continuity
Connector	Terminal	—	Continuity
D7	12	Ground	Yes

WITHOUT INTELLIGENT AROUND VIEW MONITOR SYSTEM
Door mirror LH		—	Continuity
Connector	Terminal	—	Continuity
D4	8	Ground	Yes

Is the inspection result normal?

YES >>

Replace door mirror LH. Refer to Removal and Installation.

NO >>

Repair or replace harness.

Door Mirror Rh Defogger. Component Function Check

Component Function Check

CHECK DOOR MIRROR RH DEFOGGER FUNCTION
1. CONSULT
  1. Ignition switch ON.
  2. Select “REAR DEFOGGER” in “Active Test” mode of "BCM(REAR DEFOGGER)".
  3. Select “On”.
  4. Check that the door mirror RH glass is getting warmer.
    Note:
    When glass is hot, never start inspection until it is cool enough.
Is the inspection result normal?
YES >>
Inspection End.
NO >>
Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK DOOR MIRROR RH POWER SUPPLY CIRCUIT

Ignition switch OFF.
Disconnect door mirror RH connector.
Start engine.

Check voltage between door mirror RH harness connector and ground.

WITH INTELLIGENT AROUND VIEW MONITOR
(+)		(-)	Condition		Voltage (Approx.)
Door mirror RH
Connector	Terminal
D106	6	Ground	Rear window defogger switch	ON	Battery voltage
D106	6	Ground	Rear window defogger switch	OFF	0 V

WITHOUT INTELLIGENT AROUND VIEW MONITOR
(+)		(-)	Condition		Voltage (Approx.)
Door mirror RH
Connector	Terminal
D113	4	Ground	Rear window defogger switch	ON	Battery voltage
D113	4	Ground	Rear window defogger switch	OFF	0 V

Is the inspection result normal?

YES >>

GO TO 2.

NO >>

Repair or replace harness.

CHECK DOOR MIRROR RH GROUND CIRCUIT

Ignition switch OFF.

Check continuity between door mirror RH harness connector and ground.

WITH INTELLIGENT AROUND VIEW MONITOR SYSTEM
Door mirror RH		—	Continuity
Connector	Terminal	—	Continuity
D106	12	Ground	Yes

WITHOUT INTELLIGENT AROUND VIEW MONITOR SYSTEM
Door mirror RH		—	Continuity
Connector	Terminal	—	Continuity
D113	8	Ground	Yes

Is the inspection result normal?

YES>>

Replace door mirror RH. Refer to Removal and Installation.

NO>>

Repair or replace harness.

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