B1228

DTC B1228 or DTC indicator D: A Short in the Outside Air Temperature Sensor Circuit

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic.

Is DTC B1228 or D indicated?

YES - Go to step 4.

NO - Intermittent failure.

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




7. 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 audio-HVAC display panel and the outside air temperature sensor.

NO - Go to step 8.




8. Check for continuity between the No. 12 terminal and the No. 15 terminal of audio-HVAC display panel connector A (22P).

Is there continuity?

YES - Repair short in the wires between the audio-HVAC display panel and the outside air temperature sensor.

NO - Substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.