Nissan Murano: Defogger :: Dtc/circuit Diagnosis / Rear Window Defogger Switch
CHECK REAR WINDOW DEFOGGER SWITCH FUNCTION
Check that the rear window defogger indicator lamp illuminates when the rear window defogger switch is ON.
Is the inspection result normal?
YES>>Rear window defogger switch function is OK.
NO>>Refer to Diagnosis Procedure.
CHECK REAR WINDOW DEFOGGER RELAY OPERATION
-
Ignition switch ON.
-
Check that an operation noise of rear window defogger relay [located in fuse block (J/B)] can be heard when pressing the rear window defogger switch ON and OFF.
Is the inspection result normal?
YES>>GO TO 2.
NO>>GO TO 5.
CHECK FUSE
Check if the following fuse in the fuse block (J/B) is blown:
| Component | Fuse No. | Capacity |
|---|---|---|
| Fuse block (J/B) | 22 | 10 A |
Is the inspection result normal?
YES>>GO TO 3.
NO>>Replace the blown fuse after repairing the affected circuit.
CHECK FOR VOLTAGE FROM THE REAR WINDOW DEFOGGER RELAY
-
Press rear window defogger switch.
-
Check for voltage between fuse block (J/B) connector and ground.
(+) (–) Condition Voltage
(Approx.)Fuse block (J/B) Connector Terminal M4 4P Ground Rear window defogger switch ON Battery voltage OFF 0 V
Is the inspection result normal?
YES>>GO TO 4.
NO>>Perform rear window defogger relay diagnosis. Refer to Diagnosis Procedure.
CHECK REAR WINDOW DEFOGGER SWITCH INDICATOR CIRCUIT
-
Press rear window defogger switch.
-
Check for voltage between A/C auto amp. connector and ground.
(+) (–) Condition Voltage
(Approx.)A/C auto amp. Connector Terminal M50 35 Ground Rear window defogger switch ON Battery voltage OFF 0 V
Is the inspection result normal?
YES>>Replace A/C auto amp. Refer to Removal and Installation.
NO>>Repair or replace harness.
CHECK A/C AUTO AMP. (REAR WINDOW DEFOGGER SWITCH) FUNCTION
CONSULT
-
Select “REAR DEF SW” in “Data Monitor” mode of “BCM(REAR DEFOGGER)”.
-
Check that the function operates normally according to the following conditions:
| Monitor Item | Condition | Status | |
|---|---|---|---|
| REAR DEF SW | Rear window defogger switch | Pressed | On |
| Released | Off | ||
Is the inspection result normal?
YES>>GO TO 8.
NO>>GO TO 6.
CHECK REAR WINDOW DEFOGGER ON SIGNAL CIRCUIT
Check voltage between BCM connector and ground.
| (+) | (–) | Condition |
Voltage (Approx.) | ||
|---|---|---|---|---|---|
| BCM | |||||
| Connector | Terminal | ||||
| M18 | 32 | Ground | Rear window defogger switch | ON | 0 V |
| OFF | 5 V | ||||
Is the inspection result normal?
YES>>Replace BCM. Refer to Removal and Installation.
NO>>GO TO 7.
CHECK HARNESS CONTINUITY
-
Ignition switch OFF.
-
Disconnect BCM connector and A/C auto amp. connector.
-
Check continuity between BCM harness connector and A/C auto amp. harness connector.
BCM A/C auto amp. Continuity Connector Terminal Connector Terminal M18 32 M50 15 Yes -
Check continuity between BCM harness connector and ground.
BCM Ground Continuity Connector Terminal M18 32 No
Is the inspection result normal?
YES>>Replace A/C auto amp. Refer to Removal and Installation.
NO>>Repair or replace harness.
CHECK REAR WINDOW DEFOGGER RELAY GROUND CIRCUIT
CONSULT
-
Select “REAR DEFOGGER” in “Active Test” mode of “BCM(REAR DEFOGGER)”.
-
Turn rear defogger active test ON and OFF.
-
Check voltage between fuse block (J/B) connector and ground.
(+) (–) Condition Voltage
(Approx.)Fuse block (J/B) Connector Terminal M4 6P Ground Rear defogger active test ON 0 V OFF Battery voltage
Is the inspection result normal?
YES>>GO TO 11.
NO>>GO TO 9.
CHECK REAR WINDOW DEFOGGER RELAY CIRCUIT
Check voltage between fuse block (J/B) connector and ground.
| (+) | (–) | Condition |
Voltage (Approx.) | ||
|---|---|---|---|---|---|
| Fuse block (J/B) | |||||
| Connector | Terminal | ||||
| M4 | 6P | Ground | Rear window defogger switch | ON | 0 V |
| OFF | Battery voltage | ||||
Is the inspection result normal?
YES>>Replace rear window defogger relay.
NO>>GO TO 10.
CHECK HARNESS CONTINUITY
-
Ignition switch OFF.
-
Disconnect BCM connector and fuse block (J/B) connector.
-
Check continuity between BCM harness connector and fuse block (J/B) harness connector.
BCM Fuse block (J/B) Continuity Connector Terminal Connector Terminal M19 61 M4 6P Yes -
Check continuity between fuse block (J/B) harness connector and ground.
| Fuse block (J/B) | Ground | Continuity | |
| Connector | Terminal | ||
| M4 | 6P | No | |
Is the inspection result normal?
YES>>Perform rear window defogger relay component inspection. Refer to Component Inspection. If OK, replace BCM. Refer to Removal and Installation.
NO>>Repair or replace harness.
CHECK REAR WINDOW DEFOGGER RELAY
Check rear window defogger relay. Refer to Component Inspection.
Is the inspection result normal?
YES>>GO TO 12.
NO>>Replace rear window defogger relay.
CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to Intermittent Incident.
Is the inspection result normal?
YES>>Check the following:
-
Battery power supply circuit
-
Fuse block (J/B)
Repair or replace the malfunctioning parts.
Rear Window Defogger Relay
Component Function Check
CHECK REAR WINDOW DEFOGGER RELAY POWER SUPPLY CIRCUIT
Check that an operation noise of rear window defogger relay [located in fuse block (J/B)] can be heard when turning the rear window defogger switch ON...
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LATCH (Lower Anchors and Tethers for CHildren) system
LATCH system lower anchor locations - bench seat
Your vehicle is equipped with special anchor points that are used with LATCH system compatible child restraints. This system may also be referred to as the ISOFIX or ISOFIX compatible system. With this system, you do not have to use a vehicle seat belt to secure the child restraint unless the combined weight of the child and child restraint exceeds 65 lbs. (29.5 kg). If the combined weight of the child and child restraint is greater than 65 lbs. (29.5 kg), use the vehicle’s seat belt (not the lower anchors) to install the child restraint. Be sure to follow the child restraint manufacturer’s instructions for installation.
