B1228

DTC B1228 or DTC indicator D and AUTO: 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 and AUTO indicated?

YES - Go to step 5.

NO - Intermittent failure.

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 step 7.

NO - Replace the outside air temperature sensor.

7. Disconnect the climate control unit connector A (24P).




8. Check for continuity between body ground and the climate control unit connector A (24P) terminal No. 14.

Is there continuity?

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

NO - Go to step 9.




9. Check for continuity between the climate control unit connector A (24P) terminals No. Hand No. 18.

Is there continuity?

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

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