DTC B1228 (A-A2), B1228 (06)

DTC B1228, or DTC screen A-A2, or DTC screen 06  : A short in the outside air temperature sensor circuit

DTC (AC)

1. 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
   B1228 A short in the outside air temperature sensor circuit

   Is DTC B1228, Error on the DTC screen A-A2 (climate control panel without display), or DTC screen 06 (climate control panel with display) indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure. Check for loose wires or poor connections on the outside air temperature sensor circuit.

2. Shorted 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. Measure the resistance 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	Body ground

   Is there 1 MΩ or more?

   YES 

   The TAM wire is not shorted. Go to step 3.

   NO 

   Repair a short to body ground in the TAM wire.

3. Shorted wire check (TAM line to SENSOR_COM line)

   -1. Measure the resistance 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	Climate control unit connector A (32P) No. 12

   Is there 1 MΩ or more?

   YES 

   The TAM wire and the SENSOR_COM wire are OK. Go to step 4.

   NO 

   Repair a short in the TAM wire to the SENSOR_COM wire.

4. Outside air temperature sensor check

   -1. Test the outside air temperature sensor .

   Is the outside air temperature sensor OK?

   YES 

   Replace the climate control unit .

   NO 

   Replace the outside air temperature sensor .