Specific wiring harness for upgrading Bi-Xenon headlights, including automatic headlight control. This wiring harness connects the headlights to the front and rear level sensors and the central electrical connection. Package contents: Wiring harness. Note: After installation, the sensors must be recoded via diagnostics. In some countries, it is also necessary to install an HID headlight washer system. This wiring harness is also available.