Not joined yet? Register for free and enjoy features such as alerts, private messaging and viewing latest posts and topics.

Xenon auto leveling problem

"M" Specific discussion
Post Reply
User avatar
Rene_Z4MC
Member
Member
Posts: 151
Joined: Sun Jun 02, 2013 3:50 pm

Xenon auto leveling problem

Post by Rene_Z4MC » Sat Feb 17, 2018 10:29 pm

My Xenon lights suddenly stopped doing that initial up/down cycle during start and they are constantly in the maximum low position pointing downwards. During the up/down cycle there is a humming noise but no motion in either of the headlights.

I've searched the forum and found that this usually caused by a faulty/broken trailing arm level sensor.
I removed both front and back sensors, tested them on the bench (with power supply and multimeter) and they both appear to be fine, 0.5V - 4.5V linear output range when moving the arm.

I'm a bit stuck at the moment, has anybody had this issue before or does any of you have any idea what to check next?

Any advice is welcome.

Cheers,
René
2006 Z4M Coupe Interlagos Blue, CS Wheels with Michelin PSS, Eibach, CDV delete, RTAB limiters, Vibra Technics Engine Mounts, OEM Strutbrace, ZHP gear knob

User avatar
TomK
Senior Member
Senior Member
Posts: 2363
Joined: Fri Jan 25, 2013 11:50 pm
Location: West London

Xenon auto leveling problem

Post by TomK » Sat Feb 17, 2018 10:50 pm

Both lights 'failing' at the same time indeed suggests a sensor problem. Are you sure part number 5 here hasn't failed?
http://www.bmminiparts.com/DiagramView.aspx?DiagramId=104371&MOSP=49422
One of mine was not levelling properly once. i checked everything and came to the conclusion the actuator had failed, replaced that with another known good one, no joy, put the old one back in and hey presto, all good :o go figure!
MC[IB], CSL airbox, Schrick 288/280 cams, 4.44FD, UUC SSK, SS race cat back, AP CP9660[F]/5144[R] brakes, Apex ARC-8 with AR-1 or PS5, KW ClubSport 2-way, Turner spherical arms, PMC uniball rtab, VB engine mounts, Rogue pulleys & RSMs, Tillett B6, half cage

User avatar
Rene_Z4MC
Member
Member
Posts: 151
Joined: Sun Jun 02, 2013 3:50 pm

Xenon auto leveling problem

Post by Rene_Z4MC » Sat Feb 17, 2018 10:59 pm

Hi Tom,
Yeah pretty sure the mechanical side is ok, took them both off, checked them and mounted them back, all looked fine but lights remain in the lowest position :(
2006 Z4M Coupe Interlagos Blue, CS Wheels with Michelin PSS, Eibach, CDV delete, RTAB limiters, Vibra Technics Engine Mounts, OEM Strutbrace, ZHP gear knob

User avatar
TomK
Senior Member
Senior Member
Posts: 2363
Joined: Fri Jan 25, 2013 11:50 pm
Location: West London

Xenon auto leveling problem

Post by TomK » Sun Feb 18, 2018 12:03 am

Well that is odd :( happy to post you the actuator I have spare to try if that helps.
MC[IB], CSL airbox, Schrick 288/280 cams, 4.44FD, UUC SSK, SS race cat back, AP CP9660[F]/5144[R] brakes, Apex ARC-8 with AR-1 or PS5, KW ClubSport 2-way, Turner spherical arms, PMC uniball rtab, VB engine mounts, Rogue pulleys & RSMs, Tillett B6, half cage

Post Reply