J and Auto

DTC Troubleshooting: B1233 (J and AUTO)

DTC B1233 or DTC indicator J and AUTO:

An Open in the Driver's Air Mix Control Motor Circuit

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0) and then back to ON (II).

3. Do the self-diagnostic function with the HDS or the climate control unit.

4. Check for DTCs.

Is DTC B1233 or J and AUTO indicated?

YES -

Go to step 5.

NO -

Intermittent failure, check for loose wires or poor connections in the driver's air mix control motor circuit.�

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

6. Test the driver's air mix control motor Driver's Air Mix Control Motor Test.

Is the driver's air mix control motor OK?

YES -

Go to step 7.

NO -

Replace the driver's air mix control motor Driver's Air Mix Control Motor Replacement.�

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

8. Disconnect climate control unit connector A (40P).

9. Check for continuity between the following terminals of climate control unit connector A (40P) and the driver's air mix control motor 7P connector.









Is there continuity?

YES -

Check for loose wires or poor connections at climate control unit connector A (40P) and at the driver's air mix control motor 7P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit Climate Control Unit Removal/Installation.�

NO -

Repair an open in the wire(s) between the climate control unit and the driver's air mix control motor.�