C and A/C

DTC Troubleshooting: B1235 (C and A/C)

DTC B1235 or DTC indicator C and A/C:

A Problem in the Air Mix Control Motor Circuit, Linkage, Door, or Motor

1. Clear the DTCs with the HDS.

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

3. Do the self-diagnostic function with the HDS or the climate control unit.

4. Check for DTCs.

Is DTC B1235 or C and A/C indicated?

YES -

Go to step 5.

NO -

Intermittent failure, check for loose wires or poor connections in the air mix control motor circuit.

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

6. Test the air mix control motor Air Mix Control Motor Test.

Is the air mix control motor OK?

YES -

Go to step 7.

NO -

Replace the air mix control motor Air Mix Control Motor Replacement, or repair the air mix control linkage or door.

7. Disconnect the air mix control motor 7P connector.

8. Disconnect the climate control unit 36P connector.

9. Check for continuity between the following terminals of the climate control unit 36P connector and the air mix control motor 7P connector.









Is there continuity?

YES -

Go to step 10.

NO -

Repair an open in the wires between the climate control unit and the air mix control motor.

10. Check for continuity between body ground and climate control unit 36P connector terminals No. 12 and No. 13 individually.





Is there continuity?

YES -

Repair a short to body ground in the wires between the climate control unit and the air mix control motor.

NO -

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.