DTC 9
DTC B1227 or DTC indicator 9: An Open in the Outside Air Temperature Sensor Circuit1. Clear the DTC with the HDS.
2. Operate the heater-A/C control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic.
Is DTC B1227 or 9 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 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 the HVAC control unit 30P connector.
7. Check for continuity between the HVAC control unit 30P connector No. 8 terminal and the outside air temperature sensor 2P connector No. 2 terminal.
Is there continuity?
YES - Go to step 8.
NO - Repair open in the wire between the HVAC control unit and the outside air temperature sensor.
8. Check for continuity between the HVAC control unit 30P connector No. 20 terminal and the outside air temperature sensor 2P connector No. 1 terminal.
Is there continuity?
YES - Check for loose wires or poor connections at the HVAC control unit 30P connector and at the outside air temperature sensor 2P connector. If the connections are good, substitute a known-good HVAC control unit, and recheck. If the symptom/indication goes away, replace the original HVAC control unit.
NO - Repair open in the wire between the HVAC control unit and the outside air temperature sensor.