Manufacturer Code Charts: 6

Control System DTCs

HVAC DTC Troubleshooting: 6

DTC indicator 6 : A Problem in the Mode Control Motor Circuit, Linkage, Door, or Motor

1. 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.

-3. Check for DTCs.

Is DTC 6 indicated?
-YES- Go to step 2.
-NO- Intermittent failure. Check for loose wires or poor connections on the mode control motor circuit.

2. Open wire check (M-DEF, M-VENT 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 M-DEF and M-VENT wires are not open. Go to step 3.
-NO- Repair an open in the wire(s) between the HVAC control unit and the mode control motor.

3. Shorted wire check (M-DEF line, M-VENT line):

-1. Check for continuity between test points 1 and 2 individually.














Is there continuity?
-YES- Repair a short to body ground in the wire(s) between the HVAC control unit and the mode control motor.
-NO- The M-DEF and M-VENT wires are OK. Go to step 4.

4. Mode control motor check:

-1. Test the mode control motor Mode Control Motor Test.

Is the mode control motor OK?
-YES- Replace the HVAC control unit HVAC Control Unit Removal And Installation.
-NO- Replace the mode control motor Mode Control Motor Removal And Installation, or repair the mode control linkage or doors.