Heating and A/C

DTC Troubleshooting: B1234 (2)

DTC B1234 or DTC indicator 2:

A Short in the Front Air Mix Control Motor Circuit

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 B1234 or 2 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.�

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

7. Disconnect A/C control panel connector A (22P).

8. Check for continuity between body ground and A/C control panel connector A (22P) terminals No. 3, 7, and 13 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 -

Go to step 9.

9. Check for continuity between terminals of A/C control panel connector A (22P) as follows.





Is there continuity between any of the terminals?

YES -

Repair the short in the wires.�

NO -

Go to step 10.

10. Turn the ignition switch to ON (II), and measure the same terminals for voltage to body ground.





Is there any voltage?

YES -

Repair a short to power in the wire(s) between the A/C control panel and the front air mix control motor. This short may also damage the A/C control panel. Repair the short to power before replacing the A/C control panel.�

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.�