B1240

DTC B1240 or Mode motor lock is indicated.
A Problem in the Mode Control Linkage, Doors, or Motor

1. Clear the DTC with the HDS.
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic.

Is DTC B1240 or Mode motor lock indicated?

YES - Go to step 4.

NO - Intermittent failure.

4. Turn the ignition switch OFF.
5. 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 - Replace the mode control motor, or repair the mode control linkage or doors.