Manufacturer Code Charts: 9

HVAC DTC Troubleshooting: 9

DTC indicator 9: A Problem in the Recirculation Control Linkage, Door, or Motor Circuit

4-door with M/T, 2-door

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

2. Do the self-diagnostic function with the HVAC control unit. How to Troubleshoot the Heating and A/C Systems

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.

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






9. Check for continuity between body ground and the HVAC control unit 24P connector No. 9 and No. 10 terminals individually.

Is there continuity?
YES - Repair 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.