B1227

DTC B1227 or TAM sensor open is indicated.:
An Open in the Outside Air Temperature Sensor Circuit

1. Clear the DTC with the HDS.
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic.

Is DTC B1227 or TAM sensor open indicated?

YES - Go to step 4.

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

4. Turn the ignition switch OFF.
5. Remove the outside air temperature sensor and test it.

Is the outside air temperature sensor OK?

YES - Go to step 6.

NO- Replace the outside air temperature sensor.

6. Disconnect the climate control unit 40P connector.




7. Check for continuity between the No. 16 terminal of the climate control unit 40P connector and the No. 2 terminal of the outside air temperature sensor 2P connector.

Is there continuity?

YES - Go to step 8.

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




8. Check for continuity between the No. 33 terminal of the climate control unit 40P connector and the No. 1 terminal of the outside air temperature sensor 2P connector.

Is there continuity?

YES - Check for loose wires or poor connections at the climate control unit 40P 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.

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