Nissan Maxima Service and Repair Manual: Power supply and ground circuit

BCM

BCM : Diagnosis Procedure

1. CHECK FUSE AND FUSIBLE LINK

Check if the following BCM fuses or fusible link are blown.

2. CHECK POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.
2. Disconnect BCM.
3. Check voltage between BCM harness connector and ground.

3. CHECK GROUND CIRCUIT

Check continuity between BCM harness connector and ground.

SUNROOF MOTOR ASSEMBLY

SUNROOF MOTOR ASSEMBLY : Description

• BCM supplies power.
• CPU is integrated in sunroof motor assembly.
• Tilts up/down & slides open/close by sunroof switch operation.
• In order to close sunroof lid certainly with the signal from combination meter at the time of high speed run, the sunroof motor torque at the time of tilt-down operation is controlled.

SUNROOF MOTOR ASSEMBLY : Component Function Check

1. CHECK SUNROOF MOTOR FUNCTION

Do tilt up/down & slide open/close functions operate normally with sunroof switch?

SUNROOF MOTOR ASSEMBLY : Diagnosis Procedure

SUNROOF MOTOR ASSEMBLY

1. CHECK POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.
2. Disconnect sunroof motor assembly.
3. Turn ignition switch ON.
4. Check voltage between sunroof motor assembly connector and ground.

2. CHECK GROUND CIRCUIT

1. Turn ignition switch OFF.
2. Check continuity between sunroof motor assembly connector and ground.

3. CHECK SUNROOF MOTOR CIRCUIT

1. Turn ignition switch OFF.
2. Disconnect BCM.
3. Check continuity between BCM connector (A) and sunroof motor assembly connector (B).
4. Check continuity between BCM connector (A) and ground.

4. CHECK BCM OUTPUT SIGNAL

1. Connect BCM.
2. Turn ignition switch ON.
3. Check voltage between BCM connector and ground.

5. CHECK SUNROOF SWITCH INPUT SIGNAL

1. Connect sunroof motor assembly.
2. Turn ignition switch ON.
3. Check voltage between sunroof motor assembly connector and ground.

6. CHECK SUNROOF SWITCH CIRCUIT

1. Turn ignition switch OFF.
2. Disconnect sunroof motor assembly and sunroof switch.
3. Check continuity between sunroof motor assembly connector (A) and sunroof switch connector (B).
4. Check continuity between sunroof motor assembly connector (A) and ground.

7. CHECK SUNROOF SWITCH GROUND CIRCUIT

1. Connect sunroof motor assembly.
2. Check continuity between sunroof switch connector and ground.

8. CHECK COMBINATION METER SIGNAL

1. Connect sunroof motor assembly.
2. Turn ignition switch ON.
3. Check signal between sunroof motor assembly connector and ground with oscilloscope.

9.CHECK COMBINATION METER CIRCUIT

1. Turn ignition switch OFF.
2. Disconnect combination meter.
3. Check continuity between combination meter connector (A) and sunroof motor assembly connector (B).
4. Check continuity between combination meter connector (A) and ground.

SUNROOF MOTOR ASSEMBLY : Component Inspection

SUNROOF SWITCH

1. CHECK SUNROOF SWITCH

1. Turn ignition switch OFF.
2. Disconnect sunroof switch.

SUNROOF MOTOR ASSEMBLY : Special Repair Requirement

1. PERFORM INITIALIZATION PROCEDURE

Perform initialization procedur

2. CHECK ANTI-PINCH OPERATION

Check anti-pinch operation.