Rear Mode Control Motor Circuit Troubleshooting (Without Climate Control)

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 Rear Mode Control Motor Test.

Is the rear mode control motor OK?

YES -

Go to step 7.

NO -

Replace the rear mode control motor Rear Mode Control Motor Replacement, 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.