Technical Speed Pulse location

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Technical Speed Pulse location

neilnitro

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Hi Forum, i am trying to wire a Becker SAt Nav system into my 2003 fiat punto 1.2 active sport 16v. can anybody help out with where i can locate the speed pulse wire , any help would be appreciated (y)
 
Hi,

i have also had a similar problem, mine is a 2002 (52) hgt.

Unfortunately it didn't come with the sat nav, i eventually managed to buy the unit off of ebay and fitted it. Slight snag is that i couldn't find the garla lead (speed pulse lead) spoke to a helpful chap at local fiat who told me that you had to specify sat nav at the time of ordering the car, otherwise the car will have the incorrect wiring harness in it. I then enquired about retro fitting a speed pulse wire. This was met with some caution, apparently fiats have a CAN BUS (I am sure somebody on here will explain what that means better than i) which means effectively that all electrical signals pass through just 2 wires so you need the correct wiring harness to get the speed signal to go to the stereo. He wasn't much help after this, so i spoke to a local stereo dealership who said that yes you could fit a device capable of generating its own pulse, however these are about +£80 and rely on magnetising the steel bands in your tyre.

Sorry i can't be of much help but i thought i would share the infomation i have found out. I am aware of seeing a few 1.2 puntos with sat nav and the both companies i have spoken to agree that they most likely have put in a new wiring harness.

Or has somebody else found another way?
 
Through the unique design that is fiat it requires not only requires a gps signal but also a speed pulse signal. Its to do with how the sat nav unit works. The information is stored on a cd, and the stereo knows it's gps position. However inorder for the 2 of them to speak it needs you to install the unit, hence the requirement to drive for 10 or so miles, this way it can trace the gps postion and lay over the data from the cd. hence before you install it, it will say 'your position is not on a digitised road'.

Quite a few factory fitted units use this method as it is percieved to be more accurate, and equally if for whatever reason you lose the gps signal the unit will still function unlike a tom tom.
 
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