With Climate Control

DTC Troubleshooting: B1234 (K)

DTC B1234 or DTC indicator K:

A Short in the Air Mix Control Motor Circuit (Driver's)

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 B1234 or K 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. Disconnect the driver's air mix control motor 7P connector.

6. Disconnect the climate control unit 30P connector.

7. Check for continuity between body ground and climate control unit 30P connector terminals No. 6 and No. 23 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 -

Go to step 8.

8. Check for continuity between climate control unit 30P connector terminals No. 6 and No. 22.





Is there continuity?

YES -

Repair a short in the wires between the climate control unit and the driver's air mix control motor.

NO -

Go to step 9.

9. Turn the ignition switch to ON (II), and check the same terminals for voltage between each terminal and body ground.





Is there voltage?

YES -

Repair a short to power in the wire(s) between the climate control unit and the driver's air mix control motor. This short may also damage the climate control unit. Repair the short to power before replacing the climate control unit.

NO -

Go to step 10.

10. 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 -

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

NO -

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