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 OFF, and then ON (II).

3.Do the self-diagnostic with the HDS or climate control unit.

4.Check for DTCs.

Is DTC B1227 or C indicated?


YES - Go to 5.


NO - Intermittent failure, check for loose wires or poor connections on the outside air temperature sensor circuit.n


5.Turn the ignition switch OFF.

6.Remove the outside air temperature sensor and test it.

Is the outside air temperature sensor OK?


YES - Go to 7.


NO - Replace the  outside air temperature sensor.n


7.Disconnect the climate control unit 32P connector.

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

 

Is there continuity?


YES - Go to 9.


NO - Repair open in the wire between the climate control unit and the outside air temperature sensor.n

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

 

Is there continuity?


YES - Check for loose wires or poor connections at the climate control unit 32P connector 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.n


NO - Repair open in the wire between the climate control unit and the outside air temperature sensor.n