B1227

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.

2. Turn the ignition switch to LOCK (0), and then turn to ON (II).

3. Do the self-diagnostic function with the HDS Initial Inspection and Diagnostic Overviewor climate control unit Initial Inspection and Diagnostic Overview.

4. 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.�

5. Turn the ignition switch to LOCK (0).

6. Remove the outside air temperature sensor Service and Repair, and test it Outside Air Temperature Sensor Test.

Is the outside air temperature sensor OK?

YES -

Go to step 7.

NO -

Replace the outside air temperature sensor.�

7. Disconnect climate control unit connector A (32P).

8. Check for continuity between climate control unit connector A (32P) terminal No. 25 and outside air temperature sensor 2P connector terminal No. 1.





Is there continuity?

YES -

Go to step 9.

NO -

Repair an open in the wire between the climate control unit and the outside air temperature sensor.�

9. Check for continuity between climate control unit connector A (32P) terminal No. 19 and outside air temperature sensor 2P connector terminal No. 2.





Is there continuity?

YES -

Check for loose wires or poor connections at climate control unit connector A (32P) and at the outside air temperature sensor 2P 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 Climate Control Unit Removal/Installation.�

NO -

Repair an open in the wire between the climate control unit and the outside air temperature sensor.�