( TF09E8HK711000Y1234FAAT00 )
DTC Troubleshooting: B1234 (B and A/C)
DTC B1234 or DTC indicator B and A/C:
 A Short 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 B1234 or B and A/C indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure.■
  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 body ground and the climate control unit 36P connector No. 3 and No. 5 terminals individually.
Is there continuity?
YES -
Repair short to body ground in the wires between the climate control unit and the air mix control motor.■
NO -
Go to Step 10 .
  1. Check for continuity between the climate control unit 36P connector No. 3 and No. 5 terminals.
Is there continuity?
YES -
Repair short in the wires.■
NO -
Go to Step 11 .
  1. Turn the ignition switch to ON (II), and check the same terminals for voltage to body ground.
Is there any voltage?
YES -
Repair short to power in the wires between the climate control unit and the air mix control motor. This short may also damage the climate control unit. Repair the short to power before replacing the climate control unit.■
NO -
Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit .■