Here's a video showing battery replacement. The biggest change on mk5 keys is that you cannot reprogram immobilizer chips that have already been matched to a car. If you have a 2000, it might have immo2, check for the yellow car symbol on the instrument cluster. To start the car, you must place the full key fob in the ignition slot. Use some acetone or carefully cut around it to remove the chip and then swap it with new key's chip. I suggest driving the knife where the screw is because there's a little space for it to go under the badge.
Battery replacement or key disassembly To replace the battery, keychain, or switchblade, you have to take the key apart. This is required to program new instrument clusters and keys. I suggest pointing it at the screw head because there's a little space between the screw head and badge. If you don't see any immobilizer symbol than you most likely don't have an immobilizer. Caution: Make sure to do your research before modifying your car.
Please contact your programming source prior to purchase to be certain they have the proper diagnostic tools to program this remote to your vehicle. Replacement 1J0959753F and E all have transponder chips. You can match up to 8 keys. It might not work after one, two, even ten hits, but eventually it will work. At the back edge of your door handle is a little plastic cap.
Fob has a digital code and your cars computer must recognize it. The really cheap ones that you may find on ebay or online won't work with the chips in these cars. If you are an active contributor to the sub, you are already approved to edit. You could tape the old chip to the outside of the ignition cylinder but that defeats the immobilizer anti-theft function. You must program the immobilizer totally separate from programming the keyless entry or else the immobilizer will shut off the engine after about 1 second.
Here is the other side. This has nothing to do with the remote half, only the immobilizer chip. You can check each key in this manner. While adapting each key, make sure to place the other keys away from the ignition lock reader coil. Having an expert technician look at it then is a wise step to take. And if you dug it out why not just put it into the new key? Believe it or not, this cap pops off to reveal a key hole right where you would expect it to be. Battery replacement or disassembly To replace the battery, keychain, or switchblade, you have to take the key apart.
Simply press the button on the side of the fob and the emergency key will peek through. These are the ones that are rectangular and have a button on the side. This means that the car has recognized the new keyless entry remote. Example, the oval 2 button E and the 3 button F in Europe are G and H. Tired of answering the same questions time and time again? The switchblade and button sit on top of a torsion, or twisted spring.
The metal key half holds the sidewinder side milled flip key and the immobilizer chip. This key will work in 2000 and older Volkswagens but the 3 button remote will not. They also rent the key programming tools and sell parts such as new circuit boards, covers, vw emblems, and immobilizer chips. Be sure to write down the battery change in your vehicle's service records. If your keychain is broken, you can just replace that half with a cheap key from ebay. See below to view photos and video. A small flathead screwdriver may be useful for prying out the old battery.
The remote changes to the squared buttons but the frequency of the button remote is the same as the older Volkswagens with the oval buttons. The key buttons are plastic and are more squared. Programming the fob is another thing. This remote will work on the older cars but not the newer cars. All mk5 cars use immo-4.
You must be able to lock the drivers door and have the red led alarm light next to the lock button blink. The negative side in this pic the side without writing should face you when you put the battery in. Unlock door remove key from ignition. About every 2 months mine decided to stop working and this solves the problem every time. If you place your key under the notch at the bottom of the cylinder, you can pop off the cover. The switchblade and button sit on top of a torsion, or twisted spring. Here's a video showing battery replacement.