Heating and A/C

DTC Troubleshooting: B1235 (3)

DTC B1235 or DTC indicator 3:

A Problem in the Front Air Mix Control Linkage, Door, 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 B1235 or 3 indicated?

YES -

Go to step 4.

NO -

Intermittent failure.�

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

5. Test the front air mix control motor Front Air Mix Control Motor Test.

Is the front air mix control motor OK?

YES -

Go to step 6.

NO -

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

6. Disconnect the front air mix 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 air mix 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 air mix control motor.�

9. Check for continuity between body ground and A/C control panel connector A (22P) terminals No. 21 and No. 22 individually.





Is there continuity?

YES -

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