DTC C
DTC B1227 or DTC indicator C: An Open in the Outside Air Temperature Sensor Circuit1. Clear the DTC with the HDS.
2. Turn the ignition switch to LOCK (0), and then turn to ON (II).
3. Do the self-diagnostic with the HDS or climate control unit.
4. Check for DTCs.
Is DTC B1227 or C 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, 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 (32P).
8. Check for continuity between climate control unit connector A (32P) No. 25 terminal and the outside air temperature sensor 2P connector No. 1 terminal.
Is there continuity?
YES - Go to step 9.
NO - Repair open in the wire between the climate control unit and the outside air temperature sensor.
9. Check for continuity between climate control unit connector A (32P) No. 19 terminal and the outside air temperature sensor 2P connector No. 2 terminal.
Is there continuity?
YES - Check for loose wires or poor connections at climate control unit connector A (32P) and at the outside air temperature sensor 2P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.
NO - Repair open in the wire between the climate control unit and the outside air temperature sensor.