[marty_nz]

Interesting - I'll have to ask him about that at some point when I call him about repairing some old BECM's I have.

I know it is possible to program old key FOBs to a different BECM if you have the FOB code from the old BECM, but didn't know that he had the chips to program another FOB...
I've got a few spare FOBs lying around aswell - if that's the case, it might be an alternative to me buying a second FOB.

More food for thought!!

Marty

 

[marty_nz]

It is possible to use secondhand key fobs as long as the Lockset Bar Code of the donor vehicle is known. If it is not known, a main dealer should be able to find it out from the VIN No. but may require proof of ownership - difficult if the keys are bought on fleabay. Also assuming the locks have not previously been changed and the key is the correct frequency for the country.

Once the 14 digit Lockset Bar Code is known, the 9 digit key Fob Code can be found. The Blackbox Systems Faultmate forum can supply it. The new Fob Code can then be entered and saved in the BECM to allow synchronisation.

A mixture of keys from different cars obviously cannot be used.

Or if you have the SM035 Faultmate module and the old BECM that the keys come from you can read the 3x 3 digit fob codes out of the old module and program them into another BECM to get the keys to work. I have a few sets of fobs from vehicles that have been scrapped, which I've kept record of the fob codes for, just in case someone wants a set of keys, then the remotes can be programmed.

Still easier if you know that the BECM/lockset is original to just get a key from the dealer... I'm looking forward to getting my spare one from them when JLR pull their finger out - it's been 5 weeks now!

 

[marty_nz]

Effectively, yes...

Though it can't hurt to ask if you can get it as a key 2... I don't see there being any difference these days physically as it has to just be a different ID the key is programmed to. I don't understand why they can't be done - if the same programmer is used to program a key 1 for example.

I guess I am lucky with mine - I got given Key 2 when i bought it so have been able to order a spare Key 1...

 

[marty_nz]

Not unless you have memory electric seats, no.

I found mine out as you can 'lazy unlock' the vehicle if it's superlocked - and if it's a Key 1 or 2, then it will move the seat to either preset 1 or 2 respectively. I set my presets at opposite ends of the travel, superlocked it, and then lazy unlocked and found the seat moved to preset 2 to match with Key 2.

Other than that, I don't know of any other way of telling. I've been thinking about trying to read the data stream from the RF receiver to the BECM and then do it with both keys (when my other one finally arrives) and see if it's possible to identify what tells the BECM its key ID.

Is there any way of knowing what key I already have? I've only got one for the ex-plod and the label was scraped off years ago so it could be any of them. I've got the lockset barcode on the printout that I got from LR when I needed to find out the EKA code although I doubt that is going to be much use to me. I'm actually not sure what I'd do with a spare key. Unless I lost my key then I wouldn't need it. If I left it in the house then I'd be stuffed if I lost it while I'm 1,000 miles away from home so ideally I'd need to find somewhere I could leave it with the car where I could get to it if I ever needed it.

 

[marty_nz]

Yeah, I figured the COP chip was the bit that did all the work in the FOB, and having a read through the data sheet is interesting, but don't think there is any easy way of retrieving the information from it.

I managed to get a hold of a programmer from eBay which apparently will program the Motorola CPU units... so I'm going to see if I can hook it up when I'm back from work and see if I can talk to it.

I have a couple of logic boards at home which have multiple faults on them, so messing about with one of the CPU chips on them isn't going to be an issue if I somehow destroy it!!!!

I have a spare 3rd gen receiver which was in a vehicle we stripped for parts awhile ago, so thinking of seeing if that data stream sent to the BECM can be captured and then analysed as it should hopefully be a more pure data stream.

Probably all a bit beyond me when I get into it, but will be fun to try and get anything out of it.

Pwood999, if you are interested in taking another look at some point, then it would be great to have another set of eyes on it!

Dave3d... you make good points too... there has to be some way of capturing the stream and analysing it, as otherwise the remote fob services that can clone the remotes and basically give you a second one of the same key number would be out of a job. I am guessing they identify the algorithm, decode the data in it and then program it back to a blank chip. What would be good is to see about capturing data from a key 1 and key 2 of the same lockset, and then being able to decode it and see what differences there are which may identify what the key ID is.

Probably a lot of work for little to no gain! But maybe a fun project. ..

Oh and I tested a theory you mentioned to me awhile ago with the BECM / instrument cluster connection and it does indeed work.