B1233

DTC Troubleshooting: B1233 or Indicator A and A/C ON

DTC B1233 or DTC indicator A and A/C ON:An Open in the Driver's Air Mix Control Motor Circuit

1. Clear the DTC with the HDS.

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

3. Do the self-diagnostic function with the HDS How to Troubleshoot the Climate Control System or climate control unit. How to Troubleshoot the Climate Control System

4. Check for DTCs.

Is DTC B1233 or A and A/C ON indicated?
YES - Go to step 5.

NO - Intermittent failure, check for loose wires or poor connections on 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. 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. Air Mix Control Motor Replacement


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

8. Disconnect climate control unit connector A (28P) and B (12P).

9. Check for continuity between the following terminals of climate control unit connectors A (28P), B (12P), 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 connectors A (28P), B (12P), 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. Service and Repair

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