Omega Owners Forum
Omega Help Area => Omega Electrical and Audio Help => Topic started by: countrywoman on 25 March 2025, 16:53:37
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Okay looks like I am stuck as chip and code NLA , will try local key person but might end up using after market ECU.
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More info needed. Most ECUs are really available 2nd hand, and if you are on about 2.5/3.0 performance chips, they are still fairly available. If on about key transponders or fobs, loads available.
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Its the immobilizer chip that I am missing but how do you get one made without the code?
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Its the immobilizer chip that I am missing but how do you get one made without the code?
The transponder in the key fob? Or the Immobiliser ECU?
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The one in the key
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You did install the transponder ring from the donor car...
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So the transponder chip (in the key) is generic. It is not programmable, but is (semi) unique.
The immobiliser ECU - the ring around the ignition key - needs to be programmed to "learn" each transponder chip in each key, up to a maximum of 5 transponders. The security code is needed for this.
The immobiliser ECU and engine ECU are paired together with the same security code.
So you need 3 parts to make it work - Engine ECU paired to an immobiliser ECU, with 1 or more transponders learnt by the immobiliser ECU. Simples.
Or if your donor was from a 1994 or 1995 car, you can get away with just the engine ECU, as the immobiliser was just a simple affair.
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Does the 2.5/3.0 have a separate immobiliser ECU then?
On the 2.6/3.2 there's the small board in the transponder ring and 3 (iirc), wires to the engine ECU.
The alarm/combined alarm immobiliser is a different system entirely and the donor plod would only ever have had the basic alarm.
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96 reg (P) and it was a plod estate, can you tell the year build from chassis no 21V 1031075 ?
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What I need is the security code some how as Vauxhall say they no longer have it. V looks like 97 build.
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Do you have the car pass?
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No and only ever had one key that went walkabout.
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And presumably no V5...
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Does the 2.5/3.0 have a separate immobiliser ECU then?
On the 2.6/3.2 there's the small board in the transponder ring and 3 (iirc), wires to the engine ECU.
The alarm/combined alarm immobiliser is a different system entirely and the donor plod would only ever have had the basic alarm.
All post 95 cars have the same setup - Engine ECU paired with immobiliser ECU (the ring around ignition), and the immobiliser ECU is programmed to learn the transponders.
Pre 95 cars have the IR immobiliser system, and I bet none work now, and all have the immobiliser relay bypassed. This is a simpler setup that means with just some wires, you can bypass it.
HTH
This is completely separate to the Central Locking/ATWS where the CL/ATWS behind kick panel is programmed to learn the key fobs, and controls just the CL/ATWS. This system is not linked to the immobiliser system on post 95 cars (but sort of is on pre 95, due to IR element)
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V is 97 MY.
Try another dealer, but most won't help without logbook.
So engine ECU, immobiliser ring and transponders from a scrappy.
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Ah ok that makes sense :y
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My local key wizard wants a pic of the label on the transponder, I was also thinking I might have a red card in my box of keys but not sure where that came from.
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sorted, he had the correct kit to read the transponder. Well that was when he found it as he said it not been used for a long time. If anyone needs this doing he is happy to sort one. Cost me £150 though
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sorted, he had the correct kit to read the transponder. Well that was when he found it as he said it not been used for a long time. If anyone needs this doing he is happy to sort one. Cost me £150 though
Result :y