| DTC indicator E or DTC B1229: | An Open 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 E or B1229 indicated? YES - Go to 5. NO - Intermittent failure, check for loose wires or poor connections on the sunlight sensor circuit.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 the No. 2 terminal of the sunlight sensor 2P connector. Is there continuity? YES - Go to 8. NO - Repair open in the wire between the climate control unit and the sunlight sensor.n |
| 8. | Check for continuity between the No. 15 terminal of climate control unit connector A (22P) and the No. 2 terminal of the sunlight sensor 2P connector. Is there continuity? YES - Go to 9. NO - Repair open in the wire between the climate control unit and the sunlight sensor.n |
| 9. | Reconnect the sunlight sensor 2P connector. |
| 10. | Reconnect climate control unit connector A (22P). |
| 11. | Test the sunlight sensor. Is the sunlight sensor OK? YES - Go to 12. NO - Replace the sunlight sensor.n |
| 12. | Perform the A/C communication in the Self-Diagnostic Function to obtain the IS-BUS communication verification status. Is the communication OK? YES - Check for loose wires or poor connections at climate control unit connector A (22P) and at the sunlight sensor 2P connector. If the connections are good, 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 - Check for loose wires or poor connections at climate control unit connector A (22P) and at the sunlight sensor 2P 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.n |