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Car Forum / Peugeot Cars / August 2004

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Broken Keyfobs

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razzleuk - 05 Aug 2004 21:49 GMT
Hi All

I have engineered a simple fix to the common "keyfob drains battery in
48 hours" problem that affects at least a lot of 306 owners and
perhaps owners of other models.

I discovered that an afflicted keyfob was drawing 4mA with no buttons
pressed hence the horrendous battery drain! There is a electronic fix
- modifying the button switch connections to only connect the battery
to the circuit when the button is pressed - hence defeating the failed
component and associated battery drain - works a treat on my 97 DTurbo
(2 button fob). The only downside is that to activate the second
button - you have to press the first one first. I have never used the
secondary button so it isnt an issue to me!

I hereby offer to mod peoples fobs for 25 notes - Peugeot charge about
80 quid for a new fob. You'd not have any recoding to be done or
anything - would you be interested? If so reply and we can negotiate
offline..

Raz.
Mindwipe - 05 Aug 2004 22:15 GMT
> Hi All
>
[quoted text clipped - 17 lines]
>
> Raz.
second button (ir type) arms alarm and sets deadlocks so why pray tell
aint you using it (cos its worth it for the deadlocks at least)
razzleuk - 06 Aug 2004 08:50 GMT
> second button (ir type) arms alarm and sets deadlocks so why pray tell
> aint you using it (cos its worth it for the deadlocks at least)

I am working on a complete solution to enable normal second button
operation.. Will post progress on this early next week.

Raz.

ps. My car doesn't have an alarm and you're right I should be using
the deadlocks but have never bothered.. :-)
Mindwipe - 06 Aug 2004 20:46 GMT
>>second button (ir type) arms alarm and sets deadlocks so why pray tell
>>aint you using it (cos its worth it for the deadlocks at least)
[quoted text clipped - 6 lines]
> ps. My car doesn't have an alarm and you're right I should be using
> the deadlocks but have never bothered.. :-)
btw pug reckoned it was static causing probs with the cmos chip inside
is this true then?
razzleuk - 07 Aug 2004 08:13 GMT
> btw pug reckoned it was static causing probs with the cmos chip inside
> is this true then?

It would certainly appear one of the ICs has failed. Connecting the
fob up to a power supply showed that it was pulling 4mA with no button
pressed! However the failure does not prevent the fob from operating -
as you know they work fine whilst the battery lasts. This is why
actually switching in the battery with the button press is an
effective solution..
G.T - 07 Aug 2004 12:00 GMT
Hi Jeff,

> btw pug reckoned it was static causing probs with the cmos chip inside
Oh, the old CMOS thyristor-lock side effect. I thought it was just old
stuff, and that we got rid of this annoyance with more recent chips.
Usual solution is to use two diodes : 1 between input & VDD, the other
between input & VSS. For this use (low power) I'd recommend signal diodes
like 1n4148 (possibly available as SMD).

Regards,
G.T
g.t6@worldonline.fr
205 Diesel & turbo-Diesel : http://205d.fr.st
 
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