HVAC

Rear Mode Control Motor Circuit Troubleshooting

1. Check the No. 36 (10 A) fuse in the under-dash fuse/relay box.

Is the fuse OK?

YES -

Go to step 2.

NO -

Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. 36 (10 A) fuse circuit.�

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

3. Turn the ignition switch to ON (II).

4. Measure the voltage between rear mode control motor 7P connector terminal No. 1 and body ground.





Is there battery voltage?

YES -

Go to step 5.

NO -

Repair an open in the wire between the No. 36 (10 A) fuse in the under-dash fuse/relay box and the rear mode control motor.�

5. Turn the ignition switch to LOCK (0).

6. Test the rear mode control motor .

Is the rear mode control motor OK?

YES -

Go to step 7.

NO -

Replace the rear mode control motor, or repair the rear mode control linkage or door.�

7. Disconnect HVAC control unit connector A (24P).

8. Check for continuity between body ground and HVAC control unit connector A (24P) terminals No. 1 and No. 2 individually.





Is there continuity?

YES -

Repair a short to body ground in the wire(s) between the HVAC control unit and the rear mode control motor.�

NO -

Go to step 9.

9. Turn the ignition switch to ON (II), and check the same terminals for voltage to body ground.





Is there any voltage?

YES -

Repair a short to power in the wire(s) between the HVAC control unit and the rear mode control motor. This short may also damage the HVAC control unit. Repair a short to power before replacing the HVAC control unit.�

NO -

Go to step 10.

10. Turn the ignition switch to LOCK (0).

11. Check for continuity between the following terminals of HVAC control unit connector A (24P) and the rear mode control motor 7P connector.









Is there continuity?

YES -

Check for loose wires or poor connections at HVAC control unit connector A (24P) and at the rear mode control motor 7P connector. If the connections are good, substitute a known-good HVAC control unit, and recheck. If the symptom/indication goes away, replace the original HVAC control unit HVAC Control Unit Removal/Installation.�

NO -

Repair an open in the wire(s) between the HVAC control unit and the rear mode control motor.�