DTC Troubleshooting: B1227 (05)
DTC B1227 or DTC indicator 05: An Open in the Outside Air Temperature Sensor Circuit
DTC Description
DTC
B1227 An open in the outside air temperature sensor circuit
  

1.
Problem verification:

Problem verification
?1.
Clear the DTC with the HDS.


?2.
Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

?3.
Do the Self-Diagnostic Function with the HDS or the climate control unit.

?4.
Check for DTCs.
DTC Description
DTC
B1227 An open in the outside air temperature sensor circuit
  

Is DTC B1227 or 05 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure. Check for loose wires or poor connections on the outside air temperature sensor circuit.?
2.
Open wire check (TAM line):

Open wire check (TAM line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connectors.
Climate control unit 32P connector
Outside air temperature sensor 2P connector

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Climate control unit 32P connector: disconnected
Outside air temperature sensor 2P connector: disconnected
Test point 1
Climate control unit 32P connector No. 19
Test point 2
Outside air temperature sensor 2P connector No. 1


Is there continuity?

     
YES
     
     
     
The TAM wire is not open. Go to step 3.
     
NO
     
     
     
Repair an open in the wire between the climate control unit and the outside air temperature sensor.?
3.
Open wire check (SENSOR COM line):

Open wire check (SENSOR COM line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Climate control unit 32P connector: disconnected
Outside air temperature sensor 2P connector: disconnected
Test point 1
Climate control unit 32P connector No. 23
Test point 2
Outside air temperature sensor 2P connector No. 2


Is there continuity?

     
YES
     
     
     
The SENSOR COM wire is OK. Go to step 4.
     
NO
     
     
     
Repair an open in the wire between the climate control unit and the outside air temperature sensor.?
4.
Shorted wire check (TAM line to SENSOR 5V line):

Shorted wire check (TAM line to SENSOR 5V line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Climate control unit 32P connector: disconnected
Outside air temperature sensor 2P connector: disconnected
Test point 1
Climate control unit 32P connector No. 17
Test point 2
Climate control unit 32P connector No. 19

Is there continuity?

     
YES
     
     
     
Repair a short in the wires between the climate control unit and the outside air temperature sensor.?
     
NO
     
     
     
The TAM wire to SENSOR 5V wire are not shorted. Go to step 5.
5.
Outside air temperature sensor check:

Outside air temperature sensor check
?1.
Test the outside air temperature sensor.

Is the outside air temperature sensor OK?

     
YES
     
     
     
     
NO