C

DTC Troubleshooting: B1227 or Indicator C

DTC B1227 or DTC indicator C: An Open in the Outside Air Temperature Sensor Circuit

1. Clear the DTC with the HDS.

2. Operate the climate control system in several modes.

3. Check for DTCs using the HDS or the self-diagnostic function.

Is DTC B1227 or C indicated?
YES - Go to step 4.

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


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

5. Remove the outside air temperature sensor, Service and Repair and test it. Outside Air Temperature Sensor Test

Is the outside air temperature sensor OK?
YES - Go to step 6.

NO - Replace the outside air temperature sensor.


6. Disconnect the climate control unit 30P connector.

7. Check for continuity between climate control unit 30P connector terminal No. 9 and the outside air temperature sensor 2P connector terminal No. 2.

Is there continuity?
YES - Go to step 8.

NO - Repair open in the wire between the climate control unit and the outside air temperature sensor.






8. Check for continuity between climate control unit 30P connector terminal No. 22 and outside air temperature sensor 2P connector terminal No. 1.

Is there continuity?
YES - Check for loose wires or poor connections at the climate control unit 30P connector and the outside air temperature sensor 2P connector. If the connections are good, substitute a known-good climate control unit, Climate Control Unit Removal/Installation (With Climate Control) 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.