B1228

DTC 1228 or DTC indicator D: A Short in the Outside Air Temperature Sensor Circuit

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON.
3. Operate the climate control system in several modes.
4. Check the DTCs.

Is DTC B1228 or D indicated?

YES - Go to step 5.

NO - Intermittent failure.

5. Remove the outside air temperature sensor.
6. Test the outside air temperature sensor.

Is the resistance within the specifications shown on the graph?

YES - Go to step 7.

NO - Replace the outside air temperature sensor.

7. Disconnect audio-HVAC display panel connector A (22P).




8. Check for continuity between the No. 12 terminal of audio-HVAC display panel connector A (22P) 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 - Substitute a known-good audio-HVAC display module, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.