The front lights stopped working on my friends T4 Caravelle last week. The rear lights and front sidelights and dash lights are still functioning. It has a horrid Xenon/HID conversion but have re-made some of the connections but without getting anywhere with the job and as there is no way of testing the bulbs have drawn a blank. lifted the orange fuse and the remaining lights went out so it isnt the fuse at fault. Is there a relay or something or could it be a canbus error ?.