| DTC indicator F or DTC B1230: | A Short in the Sunlight Sensor Circuit |
| 1. | Clear the DTC. |
| 2. | Turn the ignition switch OFF, and then ON. |
| 3. | Operate the climate control system is several modes. |
| 4. | Check the DTCs. Is DTC F or B1230 indicated? YES - Go to 5. NO - Intermittent failure.n |
| 5. | Disconnect the sunlight sensor 2P connector. |
| 6. | Disconnect climate control unit connector A (22P). |
| 7. | Check for continuity between the No. 13 terminal of climate control unit connector A (22P) and body ground. Is there continuity? YES - Repair short to body ground in the wire between the climate control unit and the sunlight sensor.n NO - Go to 8. |
| 8. | Reconnect the sunlight sensor 2P connector. |
| 9. | Reconnect climate control unit connector A (22P). |
| 10. | Test the sunlight sensor. Is the sunlight sensor OK? YES - Go to 11. NO - Replace the sunlight sensor.n |
| 11. | Perform the A/C communication in the Self-Diagnostic Function to obtain the IS-BUS communication verification status. Is the communication OK? YES - Substitute a known-good climate control unit and printed circuit board, and recheck. If the symptom/indication goes away, replace the original climate control unit and printed circuit board.n NO - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.n |