ECU Questions.....

[Xantianut]

Ay up!

While clearing out I discovered an engine ECU and BSI that came with the replacement locks for Otterchops. I fitted the door locks and locking fuel cap and then forgot about these.

They are for a 2.0 HDi 8v 110 HP diesel.

Can I simply fit these with the matching ignition barrel as is or will I need to code them to the car? Be nice to have just one key for all the locks. Never had that before on any car I have owned. Should have had but......

[Xantianut]

Even more confused now than before, following a Google and I think some clarification is called for.

I have the engine ECU and the box that sits beside it under the cover in the engine bay with multiple wires going into it. Is this the BSI that controls the immobiliser and the like?

Oh, I replaced the chips in the keys with virgin ones. Will these need reprogramming? And if so, does,anyone know how I do this?

Baffled by the technology. Again,

[GiveMeABreak]

I'm not sure I'm fully understanding what it is you currently have and what you want to achieve.

You have changed the car door locks with those from a donor car and therefore use the keys that came with them to unlock the car?
You have or want to fit the ignition barrel from the same donor car that you got the door locks from so you can use the same key to unlock and start the car - presently you use one key to unlock the car and another to start the car?
You have replaced the chips in the key fobs from the donor car with virginised ones?

So in order to start the car you will need to programme all the keys you will use with the vehicle in one session using the Lexia / Diagbox. Note: once programmed, they keys can't be reprogrammed to another BSI / Engine ECU (unless you get them virginsed again - which I also wasn't aware was easily done).

The ignition barrel doesn't need to be coded IIRC - the transponder aerial in the ignition ring just sends the signal from the chip in the key fob to the BSI / Engine ECU prior to authorising starting of the engine.
Why do you need to change the Engine ECU and BSI if the ones in the car already work?

[BX]

What you probably have is the BSM which is plug and play, no programming required. Also you probably have the engine ECU. The easiest way to deal with that is to have it cloned off the one that is currently fitted to the car. For EDC 15 systems like you have this can be done using Galetto or similar often over the OBD port. You can then swap the two ecus at will without touching anything else. Most chiptuning/remapping "specialists" can do it

[Xantianut]

I'm hoping to have one key for everything. I have the code for the new keys but not the car.

So, if I change the ignition barrel, can I use Lexia to program it?

Incidentally, where is the BSI?

[GiveMeABreak]

Normally when you need a set of replacement keys and you go through the dealer - they send them off to be coded using the confidential card for the car - or they can do it via the PSA database they have - but of course this will be the original code for the original Engine ECU / BSI. You don't programme the barrel - as I said, that just reads the chip in the key and sends this to the Engine ECU via the BSI.

So if you have the same BSI, Engine ECU, Keys and Barrel from the donor car, these should all work together when fitted in the new vehicle.
If you are going to do this - I would strongly recommend you take a printout or write down all your existing BSI settings from your car before fitting the donor one - as you will have to go through and check all these after fitting the replacement, as it may have been from a different spec. / model with different options and needs to be configured properly.

[RichardW]

Normally when you need a set of replacement keys and you go through the dealer - they send them off to be coded using the confidential card for the car - or they can do it via the PSA database they have - but of course this will be the original code for the original Engine ECU / BSI. You don't programme the barrel - as I said, that just reads the chip in the key and sends this to the Engine ECU via the BSI.

No....the key comes blank and you use the Lexia to write the code to the key. For subsequent starting operations then the barrel reads the key and the BSI and ECU work out if the code is correct and the ECU is unlocked to allow starting the car.

Provided Xantianut has the ECU and BSI then it should be possible to change them over, and the ignition barrel to get the key to match, and the engine should start (although you say you have new chips, in this case you will need to program the keys using a Lexia and the code for the 'new' BSI). The BSI is in the car somewhere, probably behind the glovebox. It might be necessary to re-program some of the BSI functions, depending on what was enabled on the donor car; and the VIN will be wrong in the BSI (not sure if you can re-set this).

[GiveMeABreak]

No....the key comes blank and you use the Lexia to write the code to the key. For subsequent starting operations then the barrel reads the key and the BSI and ECU work out if the code is correct and the ECU is unlocked to allow starting the car.

I am correct Richard - I was referring to getting the keys ordered at the dealer as I said in my post - not ordering a blank set. I have ordered new key fobs on several different cars via the dealers and this is how they do it.

[wheeler]

No....the key comes blank and you use the Lexia to write the code to the key. For subsequent starting operations then the barrel reads the key and the BSI and ECU work out if the code is correct and the ECU is unlocked to allow starting the car.

I am correct Richard - I was referring to getting the keys ordered at the dealer as I said in my post - not ordering a blank set. I have ordered new key fobs on several different cars via the dealers and this is how they do it.

Unless im reading you wrong I would say Richard is correct, Keys ordered from the factoy can come cut to pyiscally operate the locks but the immobiliser part is blank & needs to be coded with Lexia, the car is required for this, they don't come from the factory pre coded.

[GiveMeABreak]

You can order blanks, your choice. Mine were not and the car was not needed. The main dealer used the confidential card and their systems to order the fob / key and these took 2 weeks to be coded and cut. When they arrived they worked immediately on receipt as we too k the other car to pick them up.

I wasn't disagreeing with Richard, but relaying how I had mine done when we ordered a new Key fob. I have of course programmed keys using Lexia when I Had a BSI software update done and all keys needed recoding