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Re-sync smart fortwo key fob i recently embarked on refurbishing my 2001 pluse smart fortwo to add air conditioning as it didnt have it before. This required me to re-wire the entire car and of course play around with the ecu. upon finishing th refurbishment, i locked my car as normal and when i next tried to unlock it the next day, it wouldnt open. I bought new battery, tried the "code rolling" system of pressing the unlock button a countless times, tried resyncing it with the mercedes diagnostic machine and nothing... can anyone kindly advise what to do. I am short on money and dont want to have to spend $500 to smart to get the key reprogrammed. p.s. i bought it second hand and the seller did not have a spare key. thanks in advance for your suggestions and advice. S.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 1861 Answers

SOURCE: toyota avalon 2006 key fob apparently doesn't work

It looks like you have the "Smart Key" (a small rectangular box) that does not look like a traditional key.
What you also have is a dead battery inside the Smart Key.
Look closely at the box; there is a little button on the side. Press it. This will release a small hidden key. After you remove the small key, use a small flat blade screwdriver to pry the case of the box open at the slot provided. Take the unit to a store that sells miniature batteries, and have it replaced. You will NOT have to reprogram it after the battery is changed. The life span of the miniature batteries is roughly 20 months, less if exposed to RFI, like sitting on a TV, a monitor, or other electrical device. The Smart key TRANSMITS all of the time, even when you do not press the buttons. This is why the battery only lasts 18-20 months. Let me know if this fixes your issue..

Posted on Dec 16, 2008

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onyeredson
  • 404 Answers

SOURCE: mercedes 1999 c200 key fob

Hello Haq!
Could it be the key just needs re-coding? maybe you are worrying to much as £177 would be about right as that would need coding etc., Try phoning your local Merc dealer or take the key and V5 to them for coding (Hopefully)
Good Luck!
Paul 'W'
Onyer~EDson(:0)~[><

Posted on Jan 06, 2009

carsandcomps
  • 722 Answers

SOURCE: 2005 dodge durango key fob

Hello and thank you for choosing fixya.com. I would suggest taking your vehicle to a local auto parts store and request to have a diagnosis done. (while auto stores vary, this is usually a free service and only takes a couple minutes to complete) to see if any codes are brought up. If so, the representative can tell you what the codes mean, and what needs replaced or repaired. Let them know of the situation. Even if no codes show up, ask them to clear the codes. If this does not work, do the following. 1: make sure that the batter in your key fob is inserted correctly, and that it is the correct size and type. 2. Disconnect the + Positive cable on your battery. This will reset your the vehicles computer. Maybe this will allow the vechile to code up with the fob. If not, I would take it to dealership, or backto an auto part store for further assitance.

I thank greatly for choosing fixya.com. I hope this information is useful to you and helps you get your fob working again. Let me know if you need further assistance, or have any questions or comments. Feel free to rate this information at your earliest convenience.

Posted on Apr 01, 2009

SOURCE: key fob wont open doors or boot or lock them

you need to reprogram keys with the module. there could be a problem with the module though , you need to check it out

Posted on Aug 13, 2009

coop442000
  • 187 Answers

SOURCE: Hi! My name is Sharon

Hi, the key fob has contacts on a circuit board, much like a remote control for a tv, or a calculator. These contacts are what the buttons touch, to make it work. the buttons, or contacts may be dirty, with a carbon film on them causing the two buttons not to work, leaving only 1 functional. If you take it apart, much like putting a new battery in, you can actually pop out the green circuit board, and see the contacts. These can be cleaned with a pencil eraser. Try cleaning the contacts, and the back side of the buttons. A re program is not in order, because you have 1 function, and will either work as a whole, or none at all. If cleaning does not work, You may need a new fob. Good luck...coop442000

Posted on Sep 25, 2010

Testimonial: "Thank you, I did what you have instructed me to do with regard to cleaning the contacts with a pencil eraser. All but one still doesn't work. "

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