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. Do the self-diagnostic with the HDS or heater control unit.
  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.
  1. Remove the outside air temperature sensor and test it.
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.■