D and AUTO

DTC Troubleshooting: B1228 or Indicator D and AUTO

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 to ON (II).

3. Do the self-diagnostic function with the HDS How to Troubleshoot the Climate Control System or climate control unit. How to Troubleshoot the Climate Control System

4. Check for DTCs.

Is DTC B1228 or D and AUTO indicated?
YES - Go to step 5.

NO - Intermittent failure. Check for loose wires or poor connections on the outside air temperature sensor circuit.


5. Turn the ignition switch to LOCK (0).

6. Remove the outside air temperature sensor, Outside Air Temperature Sensor Replacement (With Climate Control) and test it. Outside Air Temperature Sensor Test (With Climate Control)

Is the outside air temperature sensor OK?
YES - Go to step 7.

NO - Replace the outside air temperature sensor.

7. Disconnect climate control unit connectors A (28P) and B (12P).

8. Check for continuity between climate control unit connector A (28P) No. 24 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 (28P) No. 24 terminal and climate control unit connector B (12P) No. 10 terminal.

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. Service and Repair