F and Auto

DTC Troubleshooting: B1230 or Indicator F and AUTO

DTC B1230 or DTC indicator F and AUTO:A Short in the Sunlight Sensor Circuit

1. Clear the DTC with the HDS.

2. Turn the ignition switch to LOCK (0), and then to ON (II).

3. Do the self-diagnostic function with the HDS Initial Inspection and Diagnostic Overview or climate control unit. Initial Inspection and Diagnostic Overview

4. Check for DTCs.

Is DTC B1230 or F and AUTO indicated?
YES - Go to step 5.

NO - Intermittent failure.


5. Turn the ignition switch to LOCK (0).

6. Disconnect the sunlight sensor 5P connector.

7. Disconnect climate control unit connector A (40P).

8. Check for continuity between climate control unit connector A (40P) terminal No. 29 and body ground.

Is there continuity?
YES - Repair short to body ground in the wire between the climate control unit and the sunlight sensor.

NO - Go to step 9.






9. Check for continuity between climate control unit connector A (40P) terminals No. 8 and No. 29.

Is there continuity?
YES - Repair short in the wires between the climate control unit and the sunlight sensor.

NO - Go to step 10.






10. Reconnect the sunlight sensor 5P connector.

11. Reconnect climate control unit connector A (40P).

12. Test the sunlight sensor. Sunlight Sensor Test

Is the sunlight sensor OK?
YES - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.

NO - Replace the sunlight sensor. Service and Repair