Manufacturer Code Charts: 1

DTC Troubleshooting: B1233 (1)

DTC B1233 or DTC indicator 1:

An Open in the Front Air Mix Control Motor Circuit

1. Clear the DTC by turning the ignition switch to LOCK (0), and then turn to ON (II).

2. Operate the A/C control system in several modes.

3. Check for DTCs using the HDS How to Troubleshoot the Heating and A/C Systems or self-diagnostic function How to Troubleshoot the Heating and A/C Systems.

Is DTC B1233 or 1 indicated?

YES -

Go to step 4.

NO -

Intermittent failure, check for loose wires or poor connections on the front air mix control motor circuit.�

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

5. Test the front air mix control motor Front Air Mix Control Motor Test.

Is the front air mix control motor OK?

YES -

Go to step 6.

NO -

Replace the front air mix control motor Front Air Mix Control Motor Replacement.�

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

7. Disconnect A/C control panel connector A (22P).

8. Check for continuity between the following terminals of A/C control panel connector A (22P) and the front air mix control motor 7P connector.









Is there continuity?

YES -

Check for loose wire or poor connections at A/C control panel connector A (22P) and at the front air mix control motor 7P connector. If the connections are good, substitute a known-good A/C control panel and recheck. If the symptom/indication goes away, replace the original A/C control panel.�

NO -

Repair an open in the wire(s) between the A/C control panel and the front air mix control motor.�