Heating and A/C

DTC Troubleshooting: B1240 (5)

DTC B1240 or DTC indicator 5:

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 A/C control system in several modes.

3. Check for DTCs using the HDS How to Troubleshoot the Heating and A/C Systems or self-diagnostic function How to Troubleshoot the Heating and A/C Systems.

Is DTC B1240 or 5 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 A/C control panel connector A (22P).

8. Check for continuity between the following terminals of A/C control panel connector A (22P) 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 A/C control panel and the front mode control motor.�

9. Check for continuity between body ground and A/C control panel connector A (22P) terminals No. 19 and No. 20 individually.





Is there continuity?

YES -

Repair a short to body ground in the wire(s) between the A/C control panel and the front mode control motor.�

NO -

Substitute a known-good A/C control panel, and recheck. If the symptom/indication goes away, replace the original A/C control panel A/C Control Panel Removal/Installation.�