HVAC Control Unit

Control System DTCs

HVAC DTC Troubleshooting: 9

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

1. Problem verification:

Problem verification
-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 (Manual A/C).

-3. Check for DTCs.

Is DTC 9 indicated?
-YES- Go to step 2.
-NO- Intermittent failure. Check for loose wires or poor connections on the recirculation control motor circuit.

2. Open wire check (F/R_MTR (FRESH)/FRS, F/R_MTR (REC)/REC lines):

Open wire check (F/R_MTR (FRESH)/FRS, F/R_MTR (REC)/REC lines)
-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connectors.





-3. Check for continuity between test points 1 and 2 respectively.














Is there continuity?
-YES- The F/R_MTR (FRESH)/FRS and F/R_MTR (REC)/REC wires are OK. Go to step 3.
-NO- Repair an open in the wire(s) between the HVAC control unit and the recirculation control motor.

3. Shorted wire check (F/R_MTR (FRESH), F/R_MTR (REC) lines):

Shorted wire check (F/R_MTR (FRESH), F/R_MTR (REC) lines)
-1. Check for continuity between test points 1 and 2 individually.














Is there continuity?
-YES- Repair a short to body ground in the wire between the HVAC control unit and the recirculation control motor.
-NO- The F/R_MTR (FRESH) and F/R_MTR (REC) wires are OK. Go to step 4.

4. Recirculation control motor check:

Recirculation control motor check
-1. Test the recirculation control motor Recirculation Control Motor Test.

Is the recirculation control motor OK?
-YES- Replace the HVAC control unit HVAC Control Unit Removal and Installation (With Navigation).
-NO- Replace the recirculation control motor Recirculation Control Motor Removal and Installation, or repair the recirculation control linkage or door.