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 back to ON (II), or press the engine start/stop button to select the OFF mode, and then the ON mode.

3. Do the self-diagnostic function with the HDS Initial Inspection and Diagnostic Overview or the 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. Check for loose wires or poor connections on the sunlight sensor circuit.


5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

6. Disconnect the sunlight sensor 2P connector.

7. Disconnect climate control unit connectors C (20P).

8. Check for continuity between climate control unit connector C (20P) terminal No. 14 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 C (20P) terminals No. 1 and No. 14.

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 2P connector.

11. Reconnect climate control unit connectors C (20P).

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