B1240
DTC B1240 or DTC indicator B: A Problem in the Mode Control Linkage, Doors, or Motor1. 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 B 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 - Go to step 7.
NO - Replace the mode control motor, or repair the mode control linkage or doors.
7. Disconnect the mode control motor 7P connector.
8. Disconnect climate control unit connector A (24P).
9. Check for continuity between the terminals of climate control unit connector A (24P) and the mode control motor 7P connector.
Is there continuity?
YES - Go to step 10.
NO - Repair open in the wire(s) between the climate control unit and the mode control motor.
10. Check for continuity between body ground and climate control unit connector A (24P) terminals No. 7 and No. 8 individually.
Is there continuity?
YES - Repair short to body ground in the wire(s) between the climate control unit and the mode control motor.
NO - Substitute a known-good climate control unit and recheck. If the symptom/indication goes away, replace the original climate control unit.