DTC 1

DTC 1: A problem in the air mix control motor circuit

1. Disconnect the air mix control motor 7P connector.
2. Test the air mix control motor.

Is the air mix control motor OK?

YES - Go to step 3.

NO - Go to step 8.

3. Disconnect the heater control panel 22P connector.




4. Check for continuity between body ground and the heater control panel 22P connector terminals No.12, 13, 16, 17 and 19 individually.

Is there continuity?

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

NO - Go to step 5.




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

Is there any voltage?

YES - Repair any short to power in the wire(s) between the heater control panel and the air mix control motor. This short also damages the heater control panel. Repair the short to power before replacing the heater control panel.

NO - Go to step 6.

6. Turn the ignition switch OFF.




7. Check for continuity between following terminals of the heater control panel 22P connector and the air mix control motor 7P connector.

Is there continuity?

YES - Check for loose wires or poor connections at the heater control panel 22P connector and at the air mix control motor 7P connector. If the connections are good, substitute a known-good heater control panel, and recheck. If the symptom/indication goes away, replace the original heater control panel.

NO - Repair any open in the wire(s) between the heater control panel and the air mix control motor.

8. Remove the air mix control motor.
9. Check the air mix control linkage and door for smooth movement.

Do the air mix control linkage and door move smoothly?

YES - Replace the air mix control motor.

NO - Repair the air mix control linkage or door.