( TF09E8HK711000Y1228FAAT00 )
DTC Troubleshooting: B1228 (D and AUTO)
DTC B1228 or DTC indicator D and AUTO:
 A Short in the Outside Air Temperature Sensor 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 B1228 or D and AUTO indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure.■
  1. Turn the ignition switch to LOCK (0).
Is the outside air temperature sensor OK?
YES -
Go to Step 7 .
NO -
Replace the outside air temperature sensor .■
  1. Disconnect the climate control unit 36P connector.
  1. Check for continuity between body ground and the climate control unit 36P connector No. 1 and No. 22 terminals individually.
Is there continuity?
YES -
Repair short to body ground in the wires between the climate control unit and the outside air temperature sensor.■
NO -
Go to Step 9 .
  1. Check for continuity between the climate control unit 36P connector No. 1 and No. 22 terminals.
Is there continuity?
YES -
Repair short in the wires between the climate control unit and the outside air temperature sensor.■
NO -
Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit .■