Heating/Air Conditioning

DTC 3: A Problem in the Front mode control motor Circuit

1. Disconnect the front mode control motor 7P connector.
2. Disconnect the heater control panel 30P connector.
3. Check for continuity between body ground and the heater control panel 30P connector terminals No. 8, 9, 15, 16, 17, 18, and 27 individually.






Is there continuity?

YES - Repair short to body ground in the wire(s) between the heater control panel and the front mode control motor.

NO - Go to step 4.

4. Turn the ignition switch ON (II), and check the same terminals for voltage.






Is there any voltage?

YES - Repair short to power in the wire(s) between the heater control panel and the front mode control motor. This short may also damage the heater control panel. Repair the short to power before replacing the heater control panel.

NO - Go to step 5.

5. Turn the ignition switch OFF.
6. Check for continuity between the following terminals of the heater control panel 30P connector and the front mode control motor 7P connector.






Is there continuity?

YES - Go to step 7.

NO - Repair open in the wire(s) between the heater control panel and front mode control motor.

7. Test the front mode control motor.

Is the front mode control motor OK?

YES - Check for loose wires or poor connections at the heater control panel connector (30P) and at front mode control motor 7P connector. If the connections are good, substitute a known-good front mode control motor and recheck. If the symptom/indication goes away, replace the original front mode control motor. If the symptom/indication continues, substitute a known-good heater control panel, and recheck. If the symptom/indication goes away, replace the original heater control panel.

NO - Replace the front mode control motor.