HVAC - Without A/C

HVAC DTC Troubleshooting: 5

DTC indicator 5: A Problem in the Mode Control Linkage, Doors, or Motor

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

2. Do the self-diagnostic with the heater control panel. How To Troubleshoot The Heating System (Without A/C)

3. Check for DTCs.

Is DTC 5 indicated?
YES - Go to step 4.

NO - Intermittent failure. Check for damaged wires or poor connections in the air mix control motor circuit.


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

5. Test the mode control motor. Mode Control Motor Test

Is the mode control motor OK?
YES - Go to step 6.

NO - Replace the mode control motor, Mode Control Motor Replacement or repair the mode control linkage or doors.


6. Check for continuity between the following terminals of the heater control panel 24P connector and the mode control motor 7P connector.





Is there continuity?
YES - Go to step 7.

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






7. Check for continuity between body ground and the heater control panel 24P connector terminals No. 14 and No. 15 individually.

Is there continuity?
YES - Repair short to body ground in the wire(s) between the heater control panel and the mode control motor.

NO - Substitute a known-good heater control panel, and recheck. If the symptom/indication goes away, replace the original heater control panel.