N

DTC Troubleshooting: B1240 or Indicator N

DTC B1240 or DTC indicator N: 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 turn 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 N indicated?
YES - Go to step 5.

NO - Intermittent failure. Check for loose wires or poor connections on the mode control motor circuit.


5. Turn the ignition switch to LOCK (0).

6. Disconnect the mode control motor 7P connector.

7. Disconnect climate control unit connector A (32P).

8. Check for continuity between the following terminals of climate control unit connector A (32P) and the mode control motor 7P connector.





Is there continuity?
YES - Go to step 9.

NO - Repair open in the wire(s) between the climate control unit and the mode control motor.






9. Check for continuity between body ground and climate control unit connector A (32P) terminals No. 10 and No. 12 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 - Go to step 10.






10. 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. Climate Control Unit Removal/Installation

NO - Replace the mode control motor, Mode Control Motor Replacement or repair the mode control linkage or doors.