Turn off the vehicle's power and open the hood.
Locate the original D1S HID bulb and remove the corresponding mounting bracket.
Unplug the original HID bulb (carefully avoid touching the bulb's glass).
Insert the XM1 D1S LED bulb and secure it.
Connect it to the corresponding connector. If a decoder or additional accessories are available, install them according to the instructions.
Start the vehicle and turn on the lights, confirming there is no flickering or error message.