Manufacturer Code Charts: 9

HVAC DTC Troubleshooting: 9

DTC indicator 9:

A Problem in the Recirculation Control Motor Circuit, Linkage, Door, or Motor

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.

3. Check for DTCs.

Is DTC 9 indicated?

YES -

Go to step 4.

NO -

Intermittent failure. Check for loose wires or poor connections on the recirculation control motor circuit.

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

5. Test the recirculation control motor Recirculation Control Motor Test.

Is the recirculation control motor OK?

YES -

Go to step 6.

NO -

Replace the recirculation control motor Recirculation Control Motor Replacement, or repair the recirculation control linkage or door.

6. Disconnect the recirculation control motor 7P connector.

7. Disconnect the HVAC control unit 24P connector.

8. Check for continuity between the following terminals of the HVAC control unit 24P connector and the recirculation control motor 7P connector.









Is there continuity?

YES -

Go to step 9.

NO -

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

9. Check for continuity between body ground and HVAC control unit 24P connector terminals No. 3 and No. 4 individually.





Is there continuity?

YES -

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

NO -

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.