With Climate Control

DTC Troubleshooting: B1235 (L)

DTC B1235 or DTC indicator L:

A Problem in the Driver's Air Mix Control Linkage, Door, or Motor

1. Clear the DTC with the HDS.

2. Operate the climate control system in several modes.

3. Check for DTCs using the HDS or the self-diagnostic function.

Is DTC B1235 or L indicated?

YES -

Go to step 4.

NO -

Intermittent failure. Check for loose wires or poor connections on the driver's air mix control motor circuit.�

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

5. Test the driver's air mix control motor Driver's Air Mix Control Motor Test (With Climate Control).

Is the driver's air mix control motor OK?

YES -

Go to step 6.

NO -

Replace the driver's air mix control motor Driver's Air Mix Control Motor Replacement (With Climate Control), or repair the driver's air mix control linkage or door.�

6. Disconnect the driver's air mix control motor 7P connector.

7. Disconnect the climate control unit 30P connector.

8. Check for continuity between the following terminals of climate control unit 30P connector and the driver's air mix 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 driver's air mix control motor.�

9. Check for continuity between body ground and climate control unit 30P connector terminals No. 16 and No. 17 individually.





Is there continuity?

YES -

Repair a short to body ground in the wire(s) between the climate control unit and the driver's air mix control motor.�

NO -

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