B1233

DTC B1233 or DTC indicator J and AUTO: An Open in the Driver's Air Mix Control Motor Circuit

1. Start the engine.
2. Turn on the A/C, then set the driver's climate control switch to max hot.
3. Turn the ignition switch OFF.
4. Clear the DTC with the HDS.
5. Turn the ignition switch OFF, and then ON (II).
6. Do the self-diagnostic with the HDS or climate control unit.
7. Check for DTCs.

Is DTC B1233 or J and AUTO indicated?

YES - Go to step 8.

NO - Intermittent failure, check for loose wires or poor connections on the driver's air mix control motor circuit.

8. Turn the ignition switch OFF.
9. Test the driver's air mix control motor.

Is the driver's air mix control motor OK?

YES - Go to step 10.

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

10. Disconnect the driver's air mix control motor 7P connector.
11. Disconnect climate control unit connector A (24P).




12. Check for continuity between the terminals of climate control unit connector A (24P) and the driver's air mix control motor 7P connector.

Is there continuity?

YES - Check for loose wire or poor connections at climate control unit connector A (24P) 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.

NO - Repair open in the wire(s) between the climate control unit and the driver's air mix control motor.