Manufacturer Code Charts: 2

HVAC DTC Troubleshooting: 2

DTC indicator 2:

A Short in the Air Mix Control Motor Circuit

1. Turn the ignition switch to LOCK (0), and then back to ON (II).

2. Do the self-diagnostic function with the HVAC control unit How To Troubleshoot The Heating And A/C Systems (Without Climate Control).

3. Check for DTCs.

Is DTC 2 indicated?

YES -

Go to step 4.

NO -

Intermittent failure. Check for loose wires or poor connections on the air mix control motor circuit.�

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

5. Disconnect the air mix control motor 7P connector.

6. Disconnect the HVAC control unit 28P connector.

7. Check for continuity between body ground and the HVAC control unit 28P connector terminals No. 6 and No. 8 individually.





Is there continuity?

YES -

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

NO -

Go to step 8.

8. Check for continuity between HVAC control unit 28P connector terminals No. 6 and No. 8.





Is there continuity?

YES -

Repair a short in the wires between the HVAC control unit and the air mix control motor.�

NO -

Go to step 9.

9. Turn the ignition switch to ON (II), and measure the voltage between body ground and the HVAC control unit 28P connector terminals No. 6 and No. 8 individually.





Is there any voltage?

YES -

Repair a short to power in the wire(s) between the HVAC control unit and the air mix control motor. This short may also damage the HVAC control unit. Repair the short to power before replacing the HVAC control unit HVAC Control Unit Removal/Installation (Without Climate Control).�

NO -

Go to step 10.

10. Test the air mix control motor Air Mix Control Motor Test (Without Climate Control).

Is the air mix control motor OK?

YES -

Check the air mix control motor operation with the original HVAC control unit. If the motor operation is no good, substitute a known-good HVAC control unit, and recheck.

If the symptom/indication goes away and the air mix control motor runs, replace the original HVAC control unit HVAC Control Unit Removal/Installation (Without Climate Control).�

NO -

Replace the air mix control motor Air Mix Control Motor Replacement (Without Climate Control).�