( TF09E8HK711000Y1233FAAT00 )
DTC Troubleshooting: B1233 (A and A/C)
DTC B1233 or DTC indicator A and A/C:
An Open in the Air Mix Control Motor Circuit
  1. Clear the DTC with the HDS.
  1. Turn the ignition switch to LOCK (0), and then to ON (II).
  1. Check for DTCs.
Is DTC B1233 or A and A/C indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, check for loose wires or poor connections on the air mix control motor circuit.■
  1. Turn the ignition switch to LOCK (0).
Is the air mix control motor OK?
YES -
Go to Step 7 .
NO -
  1. Disconnect the air mix control motor 7P connector.
  1. Disconnect the climate control unit 36P connector.
  1. Check for continuity between the following terminals of the climate control unit 36P connector and the air mix control motor 7P connector.
    36P:
    7P:
    No. 1
    No. 5
    No. 3
    No. 7
    No. 5
    No. 3

Is there continuity?
YES -
Check for loose wires or poor connections at the climate control unit 36P 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 .■
NO -
Repair open in the wires between the climate control unit and the air mix control motor.■