E53 driver side xenon intermitent problem. relay? module?

[pw44]

Hya,
After some days having troubles with my left side (driver side) xenon headlight, like working, not working, i decided to test all, to isolate the cause.
I replaced from the right (passenger side) headlight, and tested every part repalced turning on BOTH headlights.
1 - xenon bulbs - all perfect.
2 - xenon igniter - all perrfet
3 - ballast - all perfect.
Not having more in the headlights to test, i did test the sockets from the harness, and found out that the yellow wire (pin 3) for low light in driver side not transporting power.
Question: are there relays for the xenon low bems of the E53?
- If yes, where are it located?
Best regards and thx in advance.
Paulo