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[addy]

Does anyone have any idea, why the tail headlight warning comes on? It is a 1995 Omega, checked the bulbs but cannot see anything obvious. It used to come on intermittently, I changed Headbulb and it hasn't done it for ages. Now it has done it twice.

Thanks for any help.

[MonzaGSE]

I had this some years ago on a 1995 Omega. On mine the headlught/taillight warning would be on constant with the headlights turned on. Changed bulbs, cleaned connectors and checked wiring but could never figure it out. Finally i found some Opel/Vauxhall service manual for Omega B online which had a service bulletin stating that on some early cars when customer complained about headlight/taillight warning and all lights worked fine the solution was to swap the light warning module to a newer type. Early cars seemed to have a more unreliable warning module. Bought one of eBay and swapped it over. Problem went away for me and never came back.

[addy]

Thank you for the quick reply. Sorry for appearing stupid but what and where is the light warning module on a 1995 Omega Estate? They are normal headlights, not HID and doesn't have self levelling suspension.

Addy

[dave the builder]

rear number-plate lights ok ?
any non canbus  LED lamps been fitted  ?

[addy]

No Led lights, normal ones. I use the same bulbs in my 2002 Omega without any problems. Must admit never thought about the number plate lights, will check when wife gets back.

[Doctor Gollum]

rear number-plate lights ok ?
any non canbus  LED lamps been fitted  ?

This

[MonzaGSE]

Bulb control unit lives on the sidewall inside the dash where the a pillar meets the dashboard. Remove the cardboard under the dash driver side and its way up at the top above the fusebox clipped to the sidewall/a pillar. At least on lhd cars. Dont know about rhd cars but would assume it to be on driver side there to.

[addy]

Thank you, will check No. Plate lights. If ok, will check the unit. I think I have found it on ebay, is this it?

https://www.ebay.ie/itm/Genuine-Opel-Vectra-B-Omega-B-Control-Unit-Sensor-Light-Bulb-Control-9135155-/222895537893?hash=item33e59bfee5

[MonzaGSE]

Dont know that partnumber. Checked now and the part i bought for my 1995 estate is GM 90451202. Sedan might be GM 90460934.

[MonzaGSE]

And used unit will probably do fine. Since the newer type seems very reliable.

[addy]

Thanks everyone, you were correct one of the Number plate lights was loose, so was working until I tapped it, then it would go out, tap it again and it would work, so bent the connectors out slightly seems to be working.

[TheBoy]

numberplate lights aren't on check control on the Omega, so it aint that.


The saloons have 4 tail bulbs, 2 integrated into brake lights, 2 seperate. Ensure all 4 are secure. It can be fussy on really shit quality bulbs, like egay specials, or old school Halfords (but anything in last 5yrs seems fine)

[dave the builder]

numberplate lights aren't on check control on the Omega, so it aint that.


The saloons have 4 tail bulbs, 2 integrated into brake lights, 2 seperate. Ensure all 4 are secure. It can be fussy on really shit quality bulbs, like egay specials, or old school Halfords (but anything in last 5yrs seems fine)

tested by check control with the side/park lights ,they where on Carlton Omega A anyway
and repairing the number plate light has fixed the issue the OP had

[Andy B]

numberplate lights aren't on check control on the Omega, so it aint that.


The saloons have 4 tail bulbs, 2 integrated into brake lights, 2 seperate. Ensure all 4 are secure. It can be fussy on really shit quality bulbs, like egay specials, or old school Halfords (but anything in last 5yrs seems fine)

I'm glad you said that as I was sure my Omega's number plate wasn't covered 

[addy]

You are correct. The message reappeared, so between the rain took each bulb out. Passenger side with the two elements in, was not looking to good, so changed it everything seems ok for no.

The number plate bulb, being lose was a red herring.

Thanks again for the help.
Addy

[Enceladus]

I find that those 21/5W bulbs are best changed in pairs. Once one side blows the other is not far behind, even if it's a newer bulb. Use a pair of good quality bulbs and they will last. The ubiquitous Eurolec bulbs are more Euroc**p.

[Doctor Gollum]

I find that those 21/5W bulbs are best changed in pairs. Once one side blows the other is not far behind, even if it's a newer bulb. Use a pair of good quality bulbs and they will last. The ubiquitous Eurolec bulbs are more Euroc**p.

As a VX person, you should well know that the Omega uses 21/4 bulbs. Not the same thing

[Doctor Gollum]

Brief explanation here... https://www.pistonheads.com/gassing/topic.asp?t=1347621

[Andy B]

I find that those 21/5W bulbs are best changed in pairs. Once one side blows the other is not far behind, even if it's a newer bulb. Use a pair of good quality bulbs and they will last. The ubiquitous Eurolec bulbs are more Euroc**p.

As a VX person, you should well know that the Omega uses 21/4 bulbs. Not the same thing

Go on then Al ..... explain. I have to admit I've never heard of the latter 

 but I've not needed to buy a stop/tail bulb for a while

[Doctor Gollum]

Brief explanation here... https://www.pistonheads.com/gassing/topic.asp?t=1347621

The fittings are different, one is vertically offset, but otherwise opposite, tother is offset both vertically and laterally.

Both will technically fit by virtue of force and the crude design of the cluster contacts, but neither will accurately locate if you try which will lead to immediate contact issues and also severely limit the subsequent reliability should the correct bulb be fitted at a later point because the fitting on the bulb holder will have been irreversibly distorted 

[Andy B]

Brief explanation here... https://www.pistonheads.com/gassing/topic.asp?t=1347621

The fittings are different, one is vertically offset, but otherwise opposite, tother is offset both vertically and laterally.

Both will technically fit by virtue of force and the crude design of the cluster contacts, but neither will accurately locate if you try which will lead to immediate contact issues and also severely limit the subsequent reliability should the correct bulb be fitted at a later point because the fitting on the bulb holder will have been irreversibly distorted 

Ah! Which explains why you see cars with different brilliancy tail lights  .... one is a tail light T'other is a brake light 

[henryd]

Brief explanation here... https://www.pistonheads.com/gassing/topic.asp?t=1347621

The fittings are different, one is vertically offset, but otherwise opposite, tother is offset both vertically and laterally.

Both will technically fit by virtue of force and the crude design of the cluster contacts, but neither will accurately locate if you try which will lead to immediate contact issues and also severely limit the subsequent reliability should the correct bulb be fitted at a later point because the fitting on the bulb holder will have been irreversibly distorted 

My Vw uses the offset pin 21/4 watters too

[Enceladus]

I find that those 21/5W bulbs are best changed in pairs. Once one side blows the other is not far behind, even if it's a newer bulb. Use a pair of good quality bulbs and they will last. The ubiquitous Eurolec bulbs are more Euroc**p.

As a VX person, you should well know that the Omega uses 21/4 bulbs. Not the same thing

Saloons use dual filament 21/5W for the rear stop/tail bulb. And single filament 21W for the rear fog and reverse.
Estates use dual filament 21/4W for the rear fog/tail bulb. And single filament 21W for the rear stop and reverse.
The required bulb types are stated on the bulb holders.
I have no idea why the dual filament bulbs are different saloon to estate.

[Nick W]

I find that those 21/5W bulbs are best changed in pairs. Once one side blows the other is not far behind, even if it's a newer bulb. Use a pair of good quality bulbs and they will last. The ubiquitous Eurolec bulbs are more Euroc**p.

As a VX person, you should well know that the Omega uses 21/4 bulbs. Not the same thing

Saloons use dual filament 21/5W for the rear stop/tail bulb. And single filament 21W for the rear fog and reverse.
Estates use dual filament 21/4W for the rear fog/tail bulb. And single filament 21W for the rear stop and reverse.
The required bulb types are stated on the bulb holders.
I have no idea why the dual filament bulbs are different saloon to estate.

of course you do: German engineering