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.

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 B1228 or D indicated?


YES - Go to 5.


NO - Intermittent failure.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 body ground and the climate control unit 32P connector terminals No. 19 and No. 25 individually.

 

Is there continuity?


YES - Repair short to body ground in the wires between the climate control unit and the outside air temperature sensor.n


NO - Go to 9.


9.Check for continuity between the climate control unit 32P connector terminals No. 19 and No. 25.

 

Is there continuity?


YES - Repair short in the wires between the climate control unit and the outside air temperature sensor.n


NO - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original  climate control unit.n