2005 Volvo S40 immobiliser fault

[Rick111]

Default 2005 1.8 s40 immobiliser fault
Hi I’ve just bought a Volvo S40 1.8 sport with lost keys I was going to weigh the car in but it looks to nice so I’ve decided to keep it for myself I’ve purchased a full ecu and lock set from a running 2006 1.8 se and get the message immobiliser see manual the steering lock comes off when I put the key in the doors lock and open but when I crank it turns the dash lights off any help much appreciated thanks rick
I replaced main ecu, fuse box under glove box ,ignition barrel, clocks,and key

[LizardOfBodom]

Originally Posted by Rick111

Default 2005 1.8 s40 immobiliser fault
Hi I’ve just bought a Volvo S40 1.8 sport with lost keys I was going to weigh the car in but it looks to nice so I’ve decided to keep it for myself I’ve purchased a full ecu and lock set from a running 2006 1.8 se and get the message immobiliser see manual the steering lock comes off when I put the key in the doors lock and open but when I crank it turns the dash lights off any help much appreciated thanks rick
I replaced main ecu, fuse box under glove box ,ignition barrel, clocks,and key

Hi
knowing those cars (and the fact that almost anything requires "coding to the car") my first thought was that you wont be able to do anything key-coding related without visit into dealership, but in the same time you seem to have have replaced anything from donor car that would be important, so its a bit weird... Did you hear from confirmed source that such swap should work or its just a guess based on "would work on other cars" ?

[Rick111]

Originally Posted by LizardOfBodom

Hi
knowing those cars (and the fact that almost anything requires "coding to the car") my first thought was that you wont be able to do anything key-coding related without visit into dealership, but in the same time you seem to have have replaced anything from donor car that would be important, so its a bit weird... Did you hear from confirmed source that such swap should work or its just a guess based on "would work on other cars" ?

It was an ecu and lock set which consisted of the items I’ve changed I was wondering does the fuse box have any thing to do with the immobiliser or should I try putting the original one back in as the new one may be trying to do more features?

[LizardOfBodom]

Originally Posted by Rick111

It was an ecu and lock set which consisted of the items I’ve changed I was wondering does the fuse box have any thing to do with the immobiliser or should I try putting the original one back in as the new one may be trying to do more features?

See, the thing is fuse box (aka ECM) is an integral part of car itself and I know for fact replacing one is only possible by cloning the original unit. So technically you cant put a different ECM from another car and expect it to work, thats why loads of people resorted to cloning fried ECMs to new donor ones. I am pretty sure original ECM should stay in the car.
Normal way of dealing with key issues in those cars is either coding a new key to existing car (apx 300eur all in but only in dealership) or replacing SKU (the ignition "barrell") but then - again - coding it to the car. To my understanding, SKU and ECM must be coded to itself to work, and ECM must be coded to car so there is no 3rd option. Thats why I was wondering if your "swap all" would work at all...
the amount of electronically related components in this car is astonishing, dont let it fool you its 13 years old. Even adding heated seats or foglamps to existing wires and switches wont make them work without coding them to car's brain.

[Rick111]

Surly somebody has done a switch over or no’s what to replace I’m not changing individual pieces from several cars it’s all from one running car to anouther

[FunkyMelon]

As far as I'm aware these cars have several units that are all coded to the car. The programmed codes have to match with all the others for the ECU to allow the car to start, if even one is wrong, they won't start.

Problem is that I don't know which units are programmed but the whole car is just one big software link and if you introduce anything that doesn't match the rest, it won't start.

Buying any modern car without keys is a bad idea, they're far too software dependent to resolve without a dealer and an awful lot of money.

[LizardOfBodom]

Originally Posted by Rick111

Surly somebody has done a switch over or no’s what to replace I’m not changing individual pieces from several cars it’s all from one running car to anouther

Well, see, the thing is that I have never heard of anyone actually doing so, neither on this nor on US forum. And main reason for that its not as simple as on other cars, thats probably why. Even such trivial thing as radio/CD unit from the same model and equipment version WONT work in another car unless its coded in...

[spokoluzik]

Originally Posted by Rick111

Default 2005 1.8 s40 immobiliser fault
Hi I’ve just bought a Volvo S40 1.8 sport with lost keys I was going to weigh the car in but it looks to nice so I’ve decided to keep it for myself I’ve purchased a full ecu and lock set from a running 2006 1.8 se and get the message immobiliser see manual the steering lock comes off when I put the key in the doors lock and open but when I crank it turns the dash lights off any help much appreciated thanks rick
I replaced main ecu, fuse box under glove box ,ignition barrel, clocks,and key

forgot about bcm...
also most off and few more things