Is there continuity?
YES -
Go to step 10.
NO -
Repair an open in the wire between the climate control unit and the sunlight sensor.?
10. Reconnect the sunlight sensor 5P connector.
11. Reconnect climate control unit connector A (40P).
12. Test the sunlight sensor See: Heating and Air Conditioning/Testing and Inspection/Component Tests and General Diagnostics/Sunlight
Sensor Test.
Is the sunlight sensor OK?
YES -
Check for loose wires or poor connections at climate control unit connector A (40P) and at the sunlight sensor 5P connector. If the connections
are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit
See: Heating and Air Conditioning/Control Assembly/Service and Repair/Climate Control Unit Removal/Installation.?
NO -
Replace the sunlight sensor See: Heating and Air Conditioning/Sensors and Switches - HVAC/Solar Sensor/Service and Repair.?
B1230
DTC Troubleshooting: B1230 (F and AUTO)
DTC B1230 or DTC indicator F and AUTO:
A Short in the Sunlight Sensor Circuit
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS or the climate control unit.
4. Check for DTCs.
Is DTC B1230 or F and AUTO indicated?
YES -
Go to step 5.
NO -
Intermittent failure, check for loose wires or poor connections in the sunlight sensor circuit.?
5. Turn the ignition switch to LOCK (0).
