anyway of getting round the immobiliser on a xantia ???

imperial21 · Unread post by **imperial21** » 17 Dec 2010, 18:39

I am breaking a 1995 vsx and i dont have the code for the keypad anyone know a way round it ?
1111 does nt work.
i have looked at the keypad and have seen wear on 2 buttons otherwise cant see anymore

anyone have any ideas ?

Unread post by **citroenxm** » 17 Dec 2010, 18:42

Unfortunally I dont think there is... Once you know the code, you can disable the keypad, there fore unlocking the ECU...

But while locked, you need the code first before you can do anything else first.

PAul

Xaccers · Unread post by **Xaccers** » 17 Dec 2010, 19:24

Didn't think 95's had the keypad or immoiliser, I know mine didn't.
Check if the pump is actually armoured, if not you may be able to remove the immobiliser bit from it and wire up a 12v feed to the stop solenoid

Deanxm · Unread post by **Deanxm** » 17 Dec 2010, 19:26

yep, the only way around it is to fit an ecu with a known code, send your ecu off to be decoded ££££££, fit an ecu from a car with no keypad immobiliser, or remember or find the code obviously

.
What do you want to start it for? has it sunk yet too?

D

Unread post by **citroenxm** » 17 Dec 2010, 19:26

Is it DERV Xac??

DERV;s didn't have keypads but petrols had keypads from the off!!

Paul

Xaccers · Unread post by **Xaccers** » 17 Dec 2010, 19:27

Ah that would explain things, only had one of those "petrol" dohickies since '97

Deanxm · Unread post by **Deanxm** » 17 Dec 2010, 19:30

its an 8v petrol he's got

D

Unread post by **citroenxm** » 17 Dec 2010, 19:31

Knew it was a petrol of some sort, as TD's didn;t get them till late 96 to 97...

PAul

spider · Unread post by **spider** » 17 Dec 2010, 19:54

Some specialists may be able to unlock and or remove said code from the ECU for you.

But has already been said, with petrol engines you cannot really disable it until its already 'green' , then you can unplug the keypad and ignore it.

If you can find an ECU from a car with an identical engine and electronics without keypad (it might be possible) you could do a straight swap. This was possible on 106's when they first had a keypad around 97 you could get one of the earlier ECU's (if you were very lucky to get the right one)

A replacement ECU from the scrapyard with code might be another option.

A final idea is to contact these people , they seem quite helpful > http://www.alarmremotes.co.uk/products.htm , I would ask them what they can do for you, worth a phone call / email at least.

Unread post by **citroenxm** » 17 Dec 2010, 20:48

HANG ON...

Ive got a 1.8 8v ECU with known code, I took out of a P reg Estate, I did a DERV conersion with.....

Im sure its in the shed somewhere....

Paul

imperial21 · Unread post by **imperial21** » 18 Dec 2010, 18:21

as luck would have it i worked the keypad code out by the wear on the buttons !!!
out of interest how do you unlock the ecu permantly ? i have disconnected the keypad while the engine was running !

Unread post by **citroenxm** » 18 Dec 2010, 18:26

Then its done !!

DO NOT re connect the keypad... switch engine off, then start again then stop then start, as many times as you like...

Throw the keypad away, and place the original odments try in its place..

Paul

Unread post by **CitroJim** » 18 Dec 2010, 18:27

imperial21 wrote:as luck would have it i worked the keypad code out by the wear on the buttons !!!
out of interest how do you unlock the ecu permantly ? i have disconnected the keypad while the engine was running !

Well done! Excellent!

On the second point, there's some very clever people around but they don't share the methods they use.

It cannot be done with a Lexia so they must get right into the machine code of the ECU.

Unread post by **xantia_v6** » 18 Dec 2010, 18:43

CitroJim wrote: On the second point, there's some very clever people around but they don't share the methods they use.

It cannot be done with a Lexia so they must get right into the machine code of the ECU.

There is a box you can buy that just cycles through all the possible codes, it senses when the ECU is unlocked and displays the last code it entered. It is usually used for unlocking transponder ECUs (e.g. Mk2 Xantia).

spider · Unread post by **spider** » 18 Dec 2010, 19:46

Do you have remote locking ?

Its possible on most PSA (but not all) to program it to give 30 seconds or so after unlocking with the remote (does NOT work if you use the key in the door) with a green light.

Although if you have unplugged keypad (all you need to do once its green) that's enough.

Do not throw away as sometimes, if your battery is disconnected, when its reconnected the ECU will be in a locked state, you will need to plug in keypad, enter code, unplug when green light on. Some seem to suffer with this and some do not. Although to be fair they should go back to 'red' / 'lock' if the battery has been off.

Jim, yes that's correct. Although I do not know what specifics are used for this, probably a FPGA custom chip unfortunately, now if it was a straightforward Z80 or 6502 and the ECU program itself in a rom (or eprom, even better) that would possibly be a different matter