Peugeot 806 People Carrier - Won't start after re-connecting Battery

Hi folks,
I've tried various things from previous posts but still no joy
The vehicle is a Peugeot 806 People Carrier
The battery went flat from my children playing in the car.
I recharged the battery, turned the key in the ignition, typed in the usual code on the keypad and all i get now is flashing lights. I have to disconnect the battery to stop the lights flashing, taking the key out of the ignition doesn't stop the lights flashing. It appears to be something to do with the immobiliser
I've tried various permutations on the keypad that have been suggested on the forum but to no avail
The only difference i can see is my keypad, the 806 keypad has numbers "1" to "9", "C" and also "S"
The code i normally use is what i believe is the default code from the factory. Normally i put the key in, turn it, type in the four numbers, turn the key again and it starts no probs
Its driving me up the wall, why can't things be simple, it took me 4 hours to find this forum
I really hope someone can help
Thanks in advance, Mark
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First thing get rid off the kids hahahaha, i think you will have to call your peugeot dealer and ask for help.or keep playing with it and it might work, give it too one of the kids they might be able to get it to work ?
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Its monies though Chris taking it to a peugeot dealer
The plan was to take it for an MOT and sell it so i could get some monies and of course on the day its due to go in this happens.
I think your right, maybe more playing about with it. I'm sure its just a timing and sequence issue. And absolutely, the children would probably have more success than me.
It seems such a simple thing, its normal for someone to take out the battery, it shouldn't require me to take it back to the dealership. What's the point of sophiscated cars if 5 years later no one remember how to switch them on !
Someone must have the intel i need on this site or out there somewhere so i don't have to pay Mr. Peugeot lord knows how much !
I really hope someone out there can help
Thanks Chris for you kind and humorous reply
Mark
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There are several Pug experts who contribute to this group but have been quiet lately. Possibly holidays. Hopefully you will get a response fairly soon. In the meantime I can remember a number of posts on the subject of these keypads, usually on early 406 models, so a search of this group via Google Groups might be of use. I would imagine the operation of the keypads on 406 and 806 are pretty much the same.
--
Keith W
Sunbury on Thames
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I had an early 806 which managed to flatten its battery (the windscreen mounted compass fell off and hit the hazard warning switch - no-one noticed because the car was in a windowless garage) and disconnecting it caused no problems - except the radio needed its code entering before it would work, so I doubt if that is the cause of your problem.
However, repeated entry of the wrong numbers on the keypad might well be...
Ron Robinson
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R N Robinson wrote:

Highly likely that fiddling kids have locked out the immobiliser. I strongly suspect that the answer from Peugeot will be to fit a new engine management unit. That is where the pin number resides. This will be big money. Instead search the web for the firms offering car radio and ECU code reading sevices. They should be able to help you. Auto electricians probably know of suitable services too.
Once you have the engine running, unplug the keypad. After that the ECU will register the keypad as faulty or missing and not require the PIN any more. NEVER disconnect the keypad and then try and start the engine otherwise you will need the repair people again.
Bob
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Hi Folks,
Thanks for all the replies, its caused alternative ideas and other ways of thinking about it
I've got some additional info through someone else who knows a Peugeot service manager
What he's saying is that disconnecting the battery would not cause this problem, it would cause problems with the stereo but not the keypad entry system [Ron's post also said this aswell] And apparently it is possible to fix oneself, its a matter of finding the right website that has the instructions to do it, but cautions against this approach. The estimate for Peugeot to fix this problem would be 3 hours labour 90 in total however if it needs a new unit it would be considerably be more
I still think it may have something to do with the battery being disconnected because that was the moment it went wrong but if the Peugeot man say's not then its not. Maybe perhaps it was the children playing with the keypad beforehand but this doesn't make sense because the key wasn't in the ignition
I would prefer to have ago at fixing it myself if someone out there has the intel [Keith, i've tried this forums previous advice but to no avail] else in the end i'll have to swallow 90 to find out if its a reprogramming issue or the unit itself It's also a hassel getting it towed to the garage, so come on chaps there must be a way !
Many Thanks in advance, Mark
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Hi,
I found it, they're talking about different cars, but all stating the connector under the battery may have moved after a batt replacement / removal. May worth a try : http://www.ilexa.co.uk/forum/index.php?board ;action=display;threadid60
HTH, -- G.T
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Gosh, you chaps are fabulous, this is top-notch advice
The last 2 reply's have brought me really close to practically fixing the problem myself.
Your post GT makes perfect sense, its appears to fit exactly whats happened
I went out to the car, looked for the multi-plug and couldn't find it I screwed all the battery connections tighter, had another go at starting it, no joy. However i did notice the dash battery light was predominantly appearing on all turns of the key in the ignition including the first turn. In the beginning the battery was completely dead, there were no dash lights on at all. So i recharged the battery for 6 hours and re-tried which is when i ran into the problems described above Maybe i never charged it up enough ... this is where i'am now, recharging the battery to its max which may take a day
In the meantime i think i've located the multiplug ... its light blue in colour plugging into the fuse box underneath on the left hand side ... the fuse box is next to the battery, so i'm assuming this is it. I can't see how knocking the multiplug with battery removal could affect it because it looks so solid and fixed in place. Of course when the battery is fully recharged i'll do as it suggests on http://www.ilexa.co.uk/forum/index.php?board ;action=display;thread...
I'll keep you posted of how it progresses
By all means folks jump back in to the discussion if you have anything else to add
Bye for now, Mark
PS Its a shame i can't post pictures to show everyone what it looks like around the battery in a Peugeot 806. Pictures of the keypad and the dash lights may have also been useful
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In message
snipped-for-privacy@googlemail.com writes

Here we go initial prog of your code switch on ignition,red lamp will be lit default factory code is 1111 but even removing a batt. Lead should not affect your code 3 wrong attempts and it will not let you do anything for 30 mins (IG OFF) while waiting
to prog. A different code press C then enter your new code
press C again new code is stored if ok green light will flash 4 times
theres also a service code you can set by entering your code and pressing s , then enter your 4 figure service code , it must be set different from your usual code, but don't bother with that for now
what to do if the keypad is locked wait a minimum of 30 mins Ig must be off switch ig. On wait 1 minute enter your code the green lamp will light if correct code
this is from a Citroen Manuel and the way you describe yours it sounds just the same Good luck mate.
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Hi Folks,
Big thanks to Bob, GT, Johno reply's
Here's an update of where its got me to
I replaced the Peugeot battery with a working vehicles battery but it made no difference So its not the battery (100% sure)
In ref to what Bob and Johno said ... i'm of the view now the keypad is actually working fine I put the key in the ignition, turn it not all the way, red light appears on keypad, i enter 1111, red light goes off, then a green light comes on and stays on, which is absolutely correct
When i re-connect the battery without the key in the ignition ... within a minute it starts flashing the headlights and you hear the whirring of somekind of pump. This cycles on and off endlessly even after leaving it for 30mins, it appears to make no difference whatsoever what i do from the ignition and keypad end. The only way to stop it is to disconnect the battery. So its not the keypad (99% sure)
In ref to what GT said ... i can't locate any multiplug under the battery, although i can locate a big plug going into the fuse box which sits behind and alongside the battery and the connection is located as i described in a previous post. When i try to remove this plug going into the fuse unit the blue plastic i decribed earlier slides off or out and i assume this is there to give the connection extra strength. After that is removed i still cannot unplug it, it has a metal clip holding it tight and keeping it in place. Now i could proceed further and take that metal clip off but its quite a tight space to work in and if i take the metal clip off i might struggle to get it back on again. When you also factor in whether its the right multiplug to be removing in the first place and the fact its such a fortified connection that its hard to see it having problems from being knocked by the batteries removal - i'm reluctant to go any further without more confirmation.
Maybe's Could it be the starter motor ? Would a faulty starter motor cause problems in the electrical circuit and be the reason why it doesn't start ?
Could it still be a fault with the ECU even though the keypad works fine ?
Is it a connection like GT pointed us to ? Is it the connection to the fuse box ?
Is there a simple explanation that fits all the facts like GT's solution did ?
Here are some more specs for the vehicle in case it helps Peugeot 806 SR Registered - 15/03/1996 People Carrier 1998CC Petrol
I can also send photographs - parts of the engine, the dash, keypad, etc by email if this also helps find a solution
Keep going chaps, i've been overwhelmed by how good the reply's have been, it's really appreciated from my end
Bye for now, Mark
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This is a really longshot guess, but a lot of electrical problems on this group have turned out to be earthing ones. Check out the earthing from the battery to the body and to the engine unit (and anywhere esle it goes) and check that the wires themselves are in good order. Like I said, it's a long long shot, but nothing ventured........
--
Keith W
Sunbury on Thames
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wrote:

Thanks for your post Keith I checked what i could, all appeared fine
See next post for what happened in the end
Mark
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Hi folks
WHAT WAS THE OUTCOME IN THE END ....
The good news is the car is working and running ... yipeeeee ... but i have no real idea why !
Here's a description of events leading up to the car starting. Please feel free to comment as to why you think it is.
After the last post which was from Keith i basically left the car for several days. I left it with the battery connected, i walked away with it going through its song and dance routine of flashing lights. Eventually it stopped, i don't know how long that took but i'm assuming becuase the key was out of the ignition it does do.
The plan was to wait for my Dad to come round to the house so we could try to tow and jump it which is why i had to wait several days.
Today, Dad arrives, we get the tow ropes sorted, plan how we're going to do it. Whilst making preparation we noticed from turning the key in the ignition a couple of clicks the battery was nearly flat I disconnected it and put it on charge for a couple of hours
Whilst waiting for battery to charge i filled up the radiator with water which took a couple of kettles of water to fill it.
Two hours later re-connected battery - lights flashed maybe a couple of times, then remained on with no flashing just beaming
We moved fairly quickly from this point because we didn't want the battery to go flat again before we had chance to jump start it. ( as i'm writing this an interesting fact has occurred to me that was different to before and that is i left the key in the ignition whilst connecting / re-connecting battery )
At this point i'm sitting in the drivers seat, i turn the key a couple of clicks, the keypad has its red light on, i enter the "1111" code, red light goes off, green light comes on, which is what i did before and what happened before. Okay, i'm all set sitting there waiting to be towed, checked the gears are in neutral, and as i'm sitting there i think well lets give it try you never know ... i turn the key all the way and the blasted thing works, engined fired up no problems.
I'm amazed it worked because i can't see i did anything different to what i had done 50 or more times previously in trying to get it started
I'll be interested to see what you guy's think the fault may of been and why it now works
Thanks for all the help folks, much appreciated. From now on i'll always make reference to these forums when i have a vehicle fault. Its such a good thing to know that there's a place you can go where you can find the intel your looking for because intelligence is pooled in forums such as these. Keep up the good work, Mark
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And its even better when people come back and report progress, or otherwise, because we can all benefit from it. Thanks and well done.
--
Keith W
Sunbury on Thames
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