B

DTC Troubleshooting: B1240 (B)

DTC B1240 or DTC indicator B:

A Problem in the Front Mode Control Linkage, Doors, or Motor

1. Clear the DTC by turning the ignition switch to LOCK (0), and then turn to ON (II).

2. Operate the climate control system in several modes.

3. Check for DTCs using the HDS How to Troubleshoot the Climate Control System or self-diagnostic function How to Troubleshoot the Climate Control System.

Is DTC B1240 or B indicated?

YES -

Go to step 4.

NO -

Intermittent failure.�

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

5. Test the front mode control motor Front Mode Control Motor Test.

Is the front mode control motor OK?

YES -

Go to step 6.

NO -

Replace the front mode control motor Front Mode Control Motor Replacement, or repair the front mode control linkage or doors.�

6. Disconnect the front mode control motor 7P connector.

7. Disconnect the front climate control unit 30P connector.

8. Check for continuity between the following terminals of front climate control unit 30P connector and the front mode control motor 7P connector.









Is there continuity?

YES -

Go to step 9.

NO -

Repair an open in the wire(s) between the front climate control unit and the front mode control motor.�

9. Check for continuity between body ground and front climate control unit 30P connector terminals No. 8 and No. 9 individually.





Is there continuity?

YES -

Repair a short to body ground in the wire(s) between the front climate control unit and the front mode control motor.�

NO -

Substitute a known-good front climate control unit, and recheck. If the symptom/indication goes away, replace the original front climate control unit Front Climate Control Unit Removal/Installation.�