Mode Motor Lock Is Indicated

DTC Troubleshooting: B1240 or Mode motor lock is indicated

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 to LOCK (0), and then to ON (II).

3. Do the self-diagnostic with the HDS Initial Inspection and Diagnostic Overview or climate control unit. Initial Inspection and Diagnostic Overview

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 to LOCK (0).

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

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, Mode Control Motor Replacement or repair the mode control linkage or doors.