B1227

DTC Troubleshooting: B1227 (C and AUTO)

DTC B1227 or DTC indicator C and AUTO:

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 back to ON (II), or press the engine start/stop button to select the OFF mode, and then the ON mode.

3. Do the Self-Diagnostic Function with the HDS or the climate control unit.

4. Check for DTCs.

Is DTC B1227 or C and AUTO 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), or press the engine start/stop button to select the OFF mode.

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 -

With the outside air temperature sensor disconnected, go to step 7.

NO -

Replace the outside air temperature sensor Service and Repair.�

7. Disconnect climate control unit connector C (20P).

8. Check for continuity between climate control unit connector C (20P) terminal No. 17 and outside air temperature sensor 2P connector terminal No. 2.





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 C (20P) terminal No. 1 and outside air temperature sensor 2P connector terminal No. 1.





Is there continuity?

YES -

Check for loose wires or poor connections at climate control unit connector C (20P) 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 Service and Repair.�

NO -

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