[s-cars] Autocheck after relaying headlights

[Sean Douglas]

I had this problem when I installed my xenon lights, the same principle
applies. Here is a write-up I did to disable the Autocheck:

The xenons will cause a lamp out because the resistance is different and
the Autocheck lamp control module (LCM) monitors the resistance and if
it see something different it causes the bulb out symbol. This is what
the black wire is for, the problem is that for the life of me I could
not figure how to wire it up, even after studying the euro-spec wiring
diagrams. So I did what everyone else did - I disabled the LCM. The LCM
monitors the rear brake lights and rear tail-lights too, so I did not
want to disable it totally. So, in a nutshell, I bypassed the portion of
the LCM that sees the voltage/resistance for the low beams.

The LCM is located in the relay box under the hood (0042.jpg) by the
driver's firewall. It's the double relay marked 387. Remove this relay
and what you need to do is pull up on the mount to get access to the
wires below. Removing a couple of other relays around it will help.
Locate 4 wires, which are marked on the holder, 56br1 (yellow), 56bl1
(yellow/black), 58br (yellow/brown), 58bl (yellow/green). Cut the wires
as close to the connector to give you some slack. Use an insulated butt
connector and connect 56br1 to 58br and 56bl1 to 58bl. Its tight to get
your tools in here, but doable. You have now bypassed the LCM for the
low beam (xenon) and the bulb out will not come on - ever. See wiring
diagram (LCM_modified2.jpg).

Sean Douglas

> -----Original Message-----
> From: s-car-list-bounces at audifans.com 
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Eyvind Spangen
> Sent: Thursday, November 03, 2005 8:15 AM
> To: s-car-list at audifans.com
> Subject: [s-cars] Autocheck after relaying headlights
> 
> 
> I cleaned the lenses and relayed the headlights on my 
> father's car ('92) a few days ago, but as usual, the 
> autocheck thinks there is a blown bulb due to the relay only 
> being connected to the car harness on one side. How do I 
> "fool" the autocheck system into thinking everything is OK?
> 
> -- 
> E. Spangen :)
> 
> 
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