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 to LOCK (0), 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 to LOCK (0).
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 climate control unit connector A (40P).
8. Check for continuity between climate control unit connector A (40P) No. 28 terminal and body ground.






Is there continuity?

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

NO - Go to step 9.

9. Check for continuity between climate control unit connector A (40P) No. 8 and No. 28 terminals.






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.