( TF09E8HK711000Y1225FAAT00 )
DTC Troubleshooting: B1225 (A and AUTO)
DTC B1225 or DTC indicator A and AUTO:
 An Open in the In-car 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 B1225 or A and AUTO indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, check for loose wires or poor connections on the in-car temperature sensor circuit.■
  1. Turn the ignition switch to LOCK (0).
Is the in-car temperature sensor OK?
YES -
Go to Step 7 .
NO -
Replace the humidity/in-car temperature sensor .■
  1. Disconnect the climate control unit 36P connector.
  1. Check for continuity between the climate control unit 36P connector No. 20 terminal and the humidity/in-car temperature sensor 4P connector No. 1 terminal.
Is there continuity?
YES -
Go to Step 9 .
NO -
Repair open in the wire between the climate control unit and the in-car temperature sensor.■
  1. Check for continuity between the climate control unit 36P connector No. 1 terminal and the humidity/in-car temperature sensor 4P connector No. 2 terminal.
Is there continuity?
YES -
Check for loose wires or poor connections at the climate control unit 36P connector and at the humidity/in-car temperature sensor 4P 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 wire between the climate control unit and the in-car temperature sensor.■