J and A/C

DTC Troubleshooting: B1240, J and A/C

DTC B1240 or indicator J and A/C ON:

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

1. Turn the ignition switch to LOCK (0), and then to ON (II).

2. Do the self-diagnostic function with the climate control unit How to Troubleshoot the Climate Control System.

3. Check for DTCs.

Is DTC B1240 or J and A/C ON indicated?

YES -

Go to step 4.

NO -

Intermittent failure. Check for loose wires or poor connections on the mode control motor circuit.�

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

5. Test the mode control motor Mode Control Motor Test (With Climate Control).

Is the mode control motor OK?

YES -

Go to step 6.

NO -

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

6. Disconnect the mode control motor 7P connector.

7. Disconnect climate control unit connector A (28P).

8. Check for continuity between the following terminals of climate control unit connector A (28P) and the mode control motor 7P connector.









Is there continuity?

YES -

Go to step 9.

NO -

Repair an 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 (28P) terminals No. 7 and No. 8 individually.





Is there continuity?

YES -

Repair a 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 (with navigation) Climate Control Unit Removal/Installation (With Navigation), (without navigation) Climate Control Unit Removal/Installation (Without Navigation).�