Nissan Murano: Power Supply and Ground Circuit / Moonroof Motor Assembly

Description

• BCM supplies the moonroof motor assembly with power.

• CPU is integrated in moonroof motor assembly.

• Tilts up/down & slides open/close by moonroof switch operation.

• In order to close the moonroof during high speed driving, the Combination meter will send a speed signal to the moonroof CPU to adjust the torque of the motor during the tilt-down operation.

CHECK MOONROOF MOTOR FUNCTION

Does the tilt up/down & slide open/close functions operate normally with moonroof switch?

Is the inspection result normal?

Moonroof motor assembly is OK.

Refer to Diagnosis Procedure.

CHECK POWER SUPPLY CIRCUIT

1. Ignition switch OFF.

2. Disconnect the moonroof motor assembly connector.

3. Ignition switch ON.

4. Check voltage between moonroof motor assembly harness connector and ground.

   (+)		(–)	Voltage (Approx.)
   Moonroof motor assembly
   Connector	Terminal
   R4	1	Ground	Battery voltage
   	6

Is the inspection result normal?

GO TO 2.

Repair or replace harness.

CHECK GROUND CIRCUIT

1. Ignition switch OFF.

2. Check continuity between moonroof motor assembly harness connector and ground.

   Moonroof motor assembly		—	Continuity
   Connector	Terminal
   R4	5	Ground	Yes

Is the inspection result normal?

GO TO 3.

Repair or replace harness.

CHECK MOONROOF SWITCH INPUT SIGNAL

1. Connect moonroof motor assembly.

2. Ignition switch ON.

3. Check voltage between the moonroof motor assembly connector and ground.

   (+)		(–)	Condition	Voltage (Approx.)
   Moonroof motor assembly
   Connector	Terminals
   R4	7	Ground	Moonroof switch is operated TILT DOWN or SLIDE OPEN	0 V
   			Other than above	Battery voltage
   	8		Moonroof switch is operated TILT UP or SLIDE CLOSE	0 V
   			Other than above	Battery voltage

Is the inspection result normal?

GO TO 6.

GO TO 4.

CHECK MOONROOF SWITCH CIRCUIT

1. Ignition switch OFF.

2. Disconnect the moonroof motor assembly connector and moonroof switch connector.

3. Check continuity between the moonroof motor assembly harness connector and moonroof switch harness connector.

   Moonroof motor assembly		Moonroof switch		Continuity
   Connector	Terminal	Connector	Terminal
   R4	7	R9	1	Yes
   	8		8

4. Check continuity between the moonroof motor assembly harness connector and ground.

   Moonroof motor assembly		—	Continuity
   Connector	Terminal
   R4	7	Ground	No
   	8

Is the inspection result normal?

GO TO 5.

Repair or replace harness.

CHECK MOONROOF SWITCH GROUND CIRCUIT

Check continuity between the moonroof switch harness connector and ground.

Is the inspection result normal?

Refer to Component Inspection.

Repair or replace harness.

CHECK COMBINATION METER SIGNAL

Check the signal between the moonroof motor assembly harness connector and ground with oscilloscope.

Is the inspection result normal?

Replace moonroof motor assembly. Refer to Removal and Installation.

GO TO 7.

CHECK COMBINATION METER CIRCUIT

1. Ignition switch OFF.

2. Disconnect combination meter connector and moonroof motor assembly connector.

3. Check continuity between combination meter harness connector and the moonroof motor assembly harness connector.

   Combination meter		Moonroof motor assembly		Continuity
   Connector	Terminal	Connector	Terminal
   M24	38	R4	4	Yes

4. Check continuity between the combination meter harness connector and ground.

Is the inspection result normal?

Replace combination meter. Refer to Removal and Installation.

Repair or replace harness.