DTC D and AUTO
DTC B1228 or DTC indicator D and AUTO: A Short in the Outside Air Temperature Sensor Circuit1. 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.