DTC Troubleshooting: B1227 (A-A1), B1227 (05)
DTC B1227 or DTC screen A-A1 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 Error on the DTC screen A-A1 (climate control panel without display) or 05 (climate control panel with display) 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 connector A (32P)
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 connector A (32P): disconnected
Outside air temperature sensor 2P connector: disconnected
Test point 1
Climate control unit connector A (32P) No. 11
Test point 2
Outside air temperature sensor 2P connector (female terminals) No. 2:


Is there continuity?

     
YES
     
     
     
The TAM wire is not open. Go to step 3.
     
NO
     
     
     
Repair an open in the TAM wire.?
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 connector A (32P): disconnected
Outside air temperature sensor 2P connector: disconnected
Test point 1
Climate control unit connector A (32P) No. 12
Test point 2
Outside air temperature sensor 2P connector (female terminals) No. 1:


Is there continuity?

     
YES
     
     
     
The SENSOR COM wire is OK. Go to step 4.
     
NO
     
     
     
Repair an open in the SENSOR COM wire.?
4.
Shorted wire check (TAM line to power):

Shorted wire check (TAM line to power)
?1.
Turn the vehicle to the ON mode.

?2.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
Climate control unit connector A (32P): disconnected
Outside air temperature sensor 2P connector: disconnected
Test point 1
Climate control unit connector A (32P) No. 11
Test point 2
Body ground

Is there any voltage?

     
YES
     
     
     
Repair a short to power in the TAM wire.?
     
NO
     
     
     
The TAM wire is OK. Go to step 5.
5.
Outside air temperature sensor check:

Outside air temperature sensor check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Test the outside air temperature sensor.

Is the outside air temperature sensor OK?

     
YES
     
     
     
     
NO