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Home >> Honda >> 1999 >> Odyssey EX V6-3.5L >> Repair and Diagnosis >> Heating and Air Conditioning >> Heater Core >> Testing and Inspection >> Component Tests and General Diagnostics >> Rear Mode Control Motor Circuit Troubleshooting
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Rear Mode Control Motor Circuit Troubleshooting

1. Check the No.3 (7.5 A) fuse in the driver's underdash fuse/relay box.

Is the fuse OK?

YES-Go to step 2.

NO-Replace the fuse and recheck.

2. Remove the rear blower unit.

3. Disconnect the rear mode control motor 7P connector.

4. Turn the ignition switch ON (II).





5. Measure the voltage between the No.2 terminal of the rear mode control motor 7P connector and body ground.

Is there battery voltage?

YES-Go to step 6.

NO-Repair open in the wire between the No.3 fuse in the driver's under-dash fuse/relay box and the rear mode control motor.

6. Turn the ignition switch OFF.





7. Check for continuity between the No.1 terminal of the rear mode control motor 7P connector and body ground.

Is there continuity?

YES-Go to step 8.

NO-Check for an open in the wire between the rear mode control motor and body ground. If the wire is OK, check for ground at G582.

8. Test the rear mode control motor. Is the rear mode control motor OK?

YES-Go to step 11.

NO-Go to step 9.

9. Remove the rear mode control motor.

10. Check the rear mode control linkage and doors for smooth movement.

Do the rear mode control linkage and doors move smoothly?

YES-Replace the rear mode control motor.

NO-Repair the rear mode control linkage or doors.

11. Remove the rear mode control relay, and test it.

Is the relay OK?

YES-Go to step 12.

NO-Replace the rear mode control motor relay.

12. Turn the ignition switch ON (II).





13. Measure the voltage between the No.5 terminal of the rear mode control motor relay 5P socket and body ground.

Is there battery voltage?

YES-Go to step 14.

NO-Repair open in the wire between the No.3 fuse in the driver's under-dash fuse/relay box and the rear mode control motor relay.

14. Turn the ignition switch OFF.





15. Check for continuity between the No.3 and No.4 terminals of the rear mode control motor 7P connector and body ground individually.

Is there continuity?

YES-Repair short to body ground in the wire(s) between the rear mode control motor and the rear mode control motor relay.

NO-Go to step 16.





16. Check for continuity between the following terminals of the rear mode control motor 7P connector and the rear mode control motor relay 5P socket.
7P 5P
No.3 No.2
No.4 No.4

Is there continuity?

YES-Go to step 17.

NO-Repair open in the wire(s) between the rear mode control motor and the rear mode control motor relay.

17. Disconnect the rear heater-A/C passenger's control panel 10P connector.





18. Check for continuity between the No.6 terminal of the rear mode control motor 7P connector and body ground.

Is there continuity?

YES-Repair short to body ground in the wire between the rear mode control motor and the rear heater-A/C passenger's control panel.

NO-Go to step 19.





19. Check for continuity between the No.6 terminal of the rear mode control motor 7P connector and the No.7 terminal of the rear heater-A/C passenger's control panel 10P connector.

Is there continuity?

YES-Go to step 20.

NO-Repair open in the wire between the rear mode control motor and the rear heater-A/C passenger's control panel.

20. Disconnect the rear heater-A/C main switch 10P connector.





21. Check for continuity between the No.3 terminal of the rear mode control motor relay 5P socket and body ground.

Is there continuity?

YES-Repair short to body ground in the wire between the rear mode control motor relay, the rear heater-A/C main switch and the rear heater- A/C passenger's control panel.

NO-Go to step 22.








22. Check for continuity between the No.3 terminal of the rear mode control motor relay 5P socket and the No.6 terminal of the rear heater-A/C main switch 10P connector, and between the No.3 terminal of the rear mode control motor relay 5P socket and the No.2 terminal of the rear heater-A/C passenger's control panel 10P connector.

Is there continuity?

YES--Go to step 23.

NO-Repair open in the wire between the rear mode control motor relay and the rear heater-A/C main switch, or between the rear mode control motor relay and the rear heater-A/C passenger's control panel.





23. Check for continuity between the No.1 terminal of the rear mode control motor relay 5P socket and body ground.

Is there continuity?

YES-Repair short to body ground in the wire between the rear mode control motor relay, the rear heater-A/C main switch and the rear heater- A/C passenger's control panel.

NO-Go to step 24.








24. Check for continuity between the No.1 terminal of the rear mode control motor relay 5P socket and the No.7 terminal of the rear heater-A/C main switch 10P connector, and between the No.1 terminal of the rear mode control motor relay 5P socket and the No.9 terminal of the rear heater-A/C passenger's control panel 10P connector.

Is there continuity?

YES-Test the rear heater-A/C main switch and the rear heater-A/C passenger's control panel . Replace the switch as needed.

NO-Repair open in the wire between the rear mode control motor relay and the rear heater-A/C main switch, or between the rear mode control motor relay and the rear heater-A/C passenger's control panel.
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