DTC M

DTC indicator light M: A problem in the mode control linkage, doors and motor

1. Test the mode control motor.

Is the mode control motor OK?

YES - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.

NO - Go to step 2.

2. Remove the mode control motor.
3. Check the mode control linkage and doors for smooth movement.

Do the mode control linkage and doors move smoothly?

YES - Replace the air mix control motor.

NO - Repair the mode control linkage or doors.