DTC Troubleshooting: B1227 (C)
DTC B1227 or DTC indicator C:
 An Open in the Outside Air Temperature Sensor Circuit
  1. Clear the DTC with the HDS.
  1. Turn the ignition switch OFF and then ON (II).
  1. Check for DTCs.
Is DTC B1227 or C indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, check for loose wires or poor connections on the outside air temperature sensor circuit.■
  1. Turn the ignition switch OFF.
Is the outside air temperature sensor OK?
YES -
Go to Step 7 .
NO -
Replace the outside air temperature sensor .■
  1. Disconnect the heater control unit 32P connector.
  1. Check for continuity between the heater control unit 32P connector terminal No. 30 and the outside air temperature sensor 2P connector terminal No. 1.
Is there continuity?
YES -
Go to Step 9 .
NO -
Repair open in the wire between the heater control unit and the outside air temperature sensor.■
  1. Check for continuity between the heater control unit 32P connector terminal No. 24 and the outside air temperature sensor 2P connector terminal No. 2.
Is there continuity?
YES -
Check for loose wires or poor connections at the heater control unit 32P connector and at the outside air temperature sensor 2P connector. If the connections are good, substitute a known-good heater control unit, and recheck. If the symptom/indication goes away, replace the original heater control unit .■
NO -
Repair open in the wire between the heater control unit and the outside air temperature sensor.■