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[Thingymabob]

After having replaced both Xenon headlights, Tech 2 is no longer able to communicate with the headlight levelling system ("No Communication With Vehicle").
Communication with other systems work fine.
I also get an intermittent error message for malfunctioning headlight levelling system on the information screen in the car.
My first idea was that the front levelling sensor was causing this but then again, even if the sensor has gone bad, Tech 2 should still be able to communicate with the system?
Does anyone know the location of the Xenon Headlight ECU (GM part No. 90 565 31)? Maybe this part is creating the problems?
Any advice and suggestions will be greatly appreciated 

[Doctor Gollum]

Behind the right hand headlight, above the suspension pump (if fitted).

Access isn't quite a wing off job, but it helps

[Doctor Gollum]

Don't rule out the sensors though as they are both on the left of the vehicle and take a kicking in this weather with all the puddles.

Also are the motors correctly fitted to the new units

[biggriffin]

With all the Omega's I've owned, never had a problem with headlight Ecu, are you over thinking a simple fault.

An intermittent fault would say to me broken wire/loose plug. 

[Thingymabob]

Behind the right hand headlight, above the suspension pump (if fitted).

Access isn't quite a wing off job, but it helps

Thanks, then I know where to look (if needed).

Don't rule out the sensors though as they are both on the left of the vehicle and take a kicking in this weather with all the puddles.

Also are the motors correctly fitted to the new units

Referring to the motors, this is also something I'm considering. The work has been done by a small garage which had a lot of problems with the manual height adjustment of the new DEPO headlights (couldn“t be adjusted high enough). When the ignition is turned on, you can hear the level motors working but no movement can be seen, maybe because of jammed headlight inserts? The error message comes and goes in intervalls, just like the system is trying to adjust the headlights but for some reason doesn't manage to do so.
In either case, this doesn't explain why Tech 2 is no longer able to communicate with the headlight levelling system...Strange

[Thingymabob]

With all the Omega's I've owned, never had a problem with headlight Ecu, are you over thinking a simple fault.

An intermittent fault would say to me broken wire/loose plug. 

I really hope I am but why is Tech 2 no longer able to communicate with the headlight levelling system? When the original headlights were fitted, this problem didn't occur.
One consequence of this is that the levelling system couldn't be reset before installing the new headlights. Maybe this is causing the problems?
I believe the headlights have to be unmounted and fitted again, following some kind of "step by step" instruction to find out what is causing the problems. Not sure if this kind of guide is available on but I will I'll look through the forum when I have more time.

[TheBoy]

The headlight ECU is one of the slowest to respond to diags, beaten only by the sunroof one normally.  However, it should respond before the Tech2 times out, as long as the ECU has power and the diags line is in tact.

Never seen an headlight ECU fail, but have seen loom damage.

If this happened after some ham fisted garage has been in there, I'd be looking for signs of the loom being snagged, pulled, modified first.

[TheBoy]

Note, also, some of the cloned Chinese Tech2s that you can pick up sub £500 delivered do struggle to read some of the ECUs reliably.  Though if yours was able to read it previously, it suddenly wouldn't stop...

[Thingymabob]

Note, also, some of the cloned Chinese Tech2s that you can pick up sub £500 delivered do struggle to read some of the ECUs reliably.  Though if yours was able to read it previously, it suddenly wouldn't stop...

The Tech2, owned by the garage, not me, is sub £500 bought on eBay and yes, it was able to read the headlight ECU previously, including the possibility to manually adjust the headligth motors.
Now it just states "No Communication With Vehicle" when trying to access the headlight leveling system (communicates with other systems though). Very strange indeed...

[Doctor Gollum]

Something has been cobbled then

[Thingymabob]

Something has been cobbled then

It is very likely, I'm afraid.
Probably, it is about the workshop not being accustomed to handling this type of self-adjusting headlights.
Since you can hear the motors working but don't see the headlights moving, the installation must have been done incorrectly.
To find the fault, the headlights will probably have to be removed and refitted again. Will discuss this with the garage on Friday...

[Thingymabob]

Does anyone with experience of replacing the headlights, have some kind of "step by step instruction" and/or important points to consider when installing the new headlights?
In particular, I think about the parts that deal with the automatic leveling system/motors and the manual height setting.
When the system makes its basic setting of the headlight height, at every start-up, I assume that the headlights should dip down and then raised to the correct position?
Can the installation of new headlights be done without Tech2 or is it neccessary to have it in order to reset the leveling system? Or can this be done some other way? 
All information that can be used in my discussions with the garage who has done the installation would be highly appreciated 

[BazaJT]

From what I remember-it's a long time since I drove it in the dark-on turning the lights on they flare high then dip to lowest and then "centre" themselves.I've never replaced any of the headlamps so can't help as far as calibration goes.

[Doctor Gollum]

The Depo lights require some fettling to fit the ballasts properly, but everything else fits fine including the motors and wiring. And if I can do it, a halfway competent garage should be well able...

I would find another

I suspect that they have trashed your lights and motors by not removing the transit locks correctly and not fitting components correctly. Which is worrying as the lights are supplied with clear instructions regarding the transit locks... 

[Andy B]

..... as the lights are supplied with clear instructions regarding the transit locks... 

So are washing machines but I didn't notice until the washer was trying to make a bid for freedom from my garage ....