DTC Troubleshooting: B1233 (J)

DTC B1233 or DTC indicator J:  An Open in the Air Mix Control Motor Circuit

1.Clear the DTC with the HDS.

2.Turn the ignition switch OFF, and then ON (II).

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

4.Check for DTCs.

Is DTC B1233 or J indicated?


YES - Go to 5.


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


5.Turn the ignition switch OFF.

6.Test the air mix control motor.

Is the air mix control motor OK?


YES - Go to 7.


NO - Replace the air mix control motor.n


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

8.Disconnect the climate control unit 32P connector.

9.Check for continuity between the following terminals of the climate control unit 32P connector and the air mix control motor 7P connector.

32P: 7P: 
No. 7 No. 5 
No. 9 No. 2 
No. 11 No. 1 
No. 19 No. 7 
No. 27 No. 3 

 

Is there continuity?


YES - Check for loose wires or poor connections at the climate control unit 32P connector and at the 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.n


NO - Repair any open in the wires between the climate control unit and the air mix control motor.n