DTC Troubleshooting: B1230 (08)
DTC B1230 or DTC indicator 08: A Short in the Sunlight Sensor Circuit
DTC Description
DTC
B1230 A short in the sunlight 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
B1230 A short in the sunlight sensor circuit
  

Is DTC B1230 or 08 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure. Check for loose wires or poor connections on the sunlight sensor circuit.?
2.
Shorted wire check (TSUN line):

Shorted wire check (TSUN line)
?1.
Vehicle OFF (LOCK) mode

?2.
Disconnect the following connectors.
Climate control unit 32P connector
Sunlight sensor connector

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

Is there continuity?

     
YES
     
     
     
Repair a short to ground in the wire between the climate control unit and the sunlight sensor.?
     
NO
     
     
     
The TSUN wire is not shorted. Go to step 3.
3.
Shorted wire check (TSUN line to SENSOR COM line):

Shorted wire check (TSUN line to 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
Sunlight sensor connector: disconnected
Test point 1
Climate control unit 32P connector No. 3
Test point 2
Climate control unit 32P connector No. 23

Is there continuity?

     
YES
     
     
     
Repair a short in the wires between the climate control unit and the sunlight sensor.?
     
NO
     
     
     
The TSUN wire to SENSOR COM wire are not shorted. Go to step 4.
4.
Sunlight sensor check:

Sunlight sensor check
?1.
Reconnect the climate control unit 32P connector.

?2.
Test the sunlight sensor.

Is the sunlight sensor OK?

     
YES
     
     
     
     
NO