Nissan Sentra Service Manual: Power supply and ground circuit
Body control system
Body control system : diagnosis procedure
Regarding wiring diagram information, refer to bcs-51, "wiring diagram".
1.Check fuses and fusible link
Check that the following fuses and fusible link are not blown.
Is the fuse blown? Yes >> replace the blown fuse or fusible link after repairing the affected circuit.
No >> go to 2.
2.Check power supply circuit
- Disconnect BCM connector M85.
- Check voltage between bcm connector m85 and ground.
Is the inspection result normal? Yes >> go to 3.
No >> repair harness or connector.
3.Check ground circuit
Check continuity between BCM connector M85 and ground.
Is the inspection result normal? Yes >> inspection end.
No >> repair harness or connector.
Moonroof motor assembly
Moonroof motor assembly : description
- Bcm supplies power.
- Cpu is integrated in moonroof motor assembly.
- Tilts up/down & slides open/close by moonroof switch operation.
- In order to close moonroof lid certainly with the signal from combination meter at the time of high speed run, the moonroof motor torque at the time of tilt-down operation is controlled.
Moonroof motor assembly : component function check
1. Check moonroof motor function
Check whether tilt up/down & slide open/close functions operate with moonroof switch normally? Is the inspection result normal? YES >> Moonroof motor assembly is OK.
NO >> Refer to RF-20, "MOONROOF MOTOR ASSEMBLY : Diagnosis Procedure".
Moonroof motor assembly : diagnosis procedure
Regarding wiring diagram information, refer to rf-13, "wiring diagram".
Moonroof motor assembly
1. Check power supply circuit
- Turn ignition switch off.
- Disconnect moonroof motor assembly connector.
- Turn ignition switch on.
- Check voltage between moonroof motor assembly connector r26 and ground.
Is the inspection result normal? YES >> GO TO 2.
NO >> GO TO 3.
2. Check ground circuit
- Turn ignition switch off.
- Check continuity between moonroof motor assembly connector R26 and ground.
Is the inspection result normal? YES >> GO TO 5.
NO >> Repair or replace the harness or connectors.
3. Check moonroof motor circuit
- Turn ignition switch off.
- Disconnect bcm.
- Check continuity between bcm connector m85 and moonroof motor assembly connector r26.
- Check continuity between BCM connector M85 and ground.
Is the inspection result normal? Yes >> go to 4.
NO >> Repair or replace the harness or connectors.
4. Check bcm power supply
- Connect bcm.
- Check voltage between BCM connector M85 and ground.
Is the inspection result normal? Yes >> check condition of harness and connectors.
No >> replace bcm. Refer to bcs-73, "removal and installation".
5. Check moonroof switch input signal
- Connect moonroof motor assembly.
- Turn ignition switch on.
- Check voltage between moonroof motor assembly connector R26 and ground.
Is the inspection result normal? Yes >> go to 8.
No >> go to 6.
6. Check moonroof switch circuit
- Turn ignition switch off.
- Disconnect moonroof motor assembly and moonroof switch.
- Check continuity between moonroof motor assembly connector r26 and moonroof switch connector r27.
- Check continuity between moonroof motor assembly connector r26 and ground.
Is the inspection result normal? YES >> GO TO 7.
NO >> Repair or replace the harness and connectors.
7. Check moonroof switch ground circuit
- Connect moonroof motor assembly.
- Check continuity between moonroof switch connector r27 and ground.
Is the inspection result normal? Yes >> refer to rf-22, "moonroof motor assembly : component inspection".
No >> repair or replace the harness or connectors.
8. Check combination meter signal
- Check signal between moonroof motor assembly connector R26 and ground with oscilloscope.
Is the inspection result normal? Yes >> replace moonroof motor assembly. Refer to rf-41, "removal and installation". After that, refer to rf-18, "additional service when replacing control unit : special repair requirement".
No >> go to 9.
9.Check combination meter circuit
- Turn ignition switch OFF.
- Disconnect combination meter.
- Check continuity between combination meter connector m24 and moonroof motor assembly connector r26.
- Check continuity between combination meter connector M24 and ground.
Is the inspection result normal? Yes >> replace combination meter. Refer to mwi-77, "removal and installation".
No >> repair or replace the harness or connectors.
Moonroof motor assembly : component inspection
Moonroof switch
1. Check moonroof switch
- Turn ignition switch off.
- Disconnect moonroof switch.
- Check continuity between moonroof switch terminals.
Is the inspection result normal? Yes >> moonroof switch is ok.
No >> replace moonroof switch (map lamp assembly). Refer to rf-50, "removal and installation".
Moonroof motor assembly : special repair requirement
1. Perform initialization procedure
Perform initialization procedure.
Refer to rf-18, "additional service when replacing control unit : special repair requirement".
>> Go to 2.
2. Check anti-pinch operation
Check anti-pinch operation.
Refer to rf-18, "additional service when replacing control unit : special repair requirement".
Is the inspection result normal? Yes >> inspection end.
No >> check fitting adjustment. Refer to rf-40, "adjustment".
Moonroof switch
Description
Transmits switch operation signal to moonroof motor assembly.
Diagnosis Procedure
Regarding Wiring Diagram information, refer to RF-13, "Wiring Diagram".
1.Check moonroof sw ...
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Interview the customer if possible, to determine the conditions that exist
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CAUTION:
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Turn ignition switch OFF.
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