B1234

DTC B1234 or DTC indicator J: A Short in the Driver's Air Mix Control Motor Circuit

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic.

Is DTC B1234 or J indicated?

YES - Go to step 4.

NO - Intermittent failure.

4. Turn the ignition switch OFF.
5. Test the driver's air mix control motor.

Is the driver's air mix control motor OK?

YES - Go to step 6.

NO - Replace the driver's air mix control motor.

6. Disconnect the driver's air mix control motor 7P connector.
7. Disconnect audio-HVAC display panel connector A (22P).




8. Check for continuity between body ground and audio-HVAC display panel connector A (22P) terminals No. 1, 8,9, 15, and 20 individually.

Is there continuity?

YES - Repair any short to body ground in the wire(s) between the audio-HVAC display panel and the driver's air mix control motor.

NO - Go to step 9.




9. Check for continuity between the terminals of audio-HVAC display 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 ON (II), and check the same terminals for voltage.

Is there any voltage?

YES - Repair any short to power in the wire(s) between the audio-HVAC display panel and the driver's air mix control motor. This short may also damage the audio-HVAC display panel. Repair the short to power before replacing the audio-HVAC display panel.

NO - Substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.