DTC Troubleshooting: B1228 (D)
DTC B1228 or DTC indicator D:
 A Short 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 B1228 or D indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure.■
  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 body ground and the heater control unit 32P connector terminal No. 30.
Is there continuity?
YES -
Repair short to body ground in the wire between the heater control unit and the outside air temperature sensor.■
NO -
Go to Step 9 .