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. Turn the ignition switch OFF and then ON (II).
3. Do the self-diagnostic with the HDS or climate control unit.
4. Check for DTCs.

Is DTC B1240 or Mode motor lock indicated?

YES - Go to step 5.

NO - Intermittent failure.

5. Turn the ignition switch OFF.

6. 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.