Mercedes s420 keyless entry reprogram

This is common on the CLK 500, but usually its just that the remote control wears out. I have changed mine twice already in 70,000 miles. Buy a new remote key fob and it likely will solve your problems if a simple battery change did not do the job. Always try that first and use top grade batteries, not those from the dollar store, because they fail too soon.

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try and pull drivers door switch and replace,also change fuse in trunk.If that don't work ask the benz world .org forum to sho you how to rebuild pump for cheap.

Frankly, I can't see the logic in that. Replace a motor that runs with a new motor. Won't the new motor do the same thing? I would want to speak to a dealer technician or mechanic. Or somebody who has done extensive work and knows your model. Big chunk of money, modern cars are getting way too expensive.

Depending on the specification of your vehicle, the FOB generally serves one (or both) of the following functions:

1) Communicate with the vehicle's Keyless Entry system (operates central locking).
2) When inserted into the ignition, the transponder within the key will communicate with the vehicle's Body computer (BEM) to validate entry, before disengaging the immobilizer - allowing the vehicle to start.

When the key fob fails, you may lose functionality of the above systems.

Keyless entry failure - usually due to flat battery in the fob. Reprogramming of keyless entry can be done without dealership assistance.

Transponder/Immobilizer failure - this requires the key fob to be re-programmed by your local dealership.


Hope this helps....

If your keyless entry remote has never worked it either needs to be programmed to the vehicle or it is the incorrect remote part number for they vehicle. First step is to call your local dealership, ask for service, then verify your vehicle came equipped with the keyless entry option and verify the key fob part number. When calling the dealer have your vin# handy, they will need that. Once you have verified your vehicle has keyless entry option and you have the correct keyless entry remote part number then find a locksmith to program the remote to your vehicle. We suggest a locksmith because they are usually more affordable than the dealer and they come to you.

If your keyless entry remote has worked before and it just stopped working, here are a few tips to try to get it working again:

1) Change the battery
Batteries don't last forever, you'll be surprised how often it's just a dead battery! Search our YouTube channel on how to change a key fob battery for your specific year, make, and model!

2) Wipe the board
The board inside your remote can get a lot more filthy than you think! When the board is dirty it can prohibit the contact to the circuit board when you push down on the button. Simply wiping the circuit board off can make your key fob like new again!

3) Get it checked
Go to your local hardware store like AutoZone or Oreilly's. They usually have a RF frequency tester. This little gadget will let you know if your key fob is sending a signal. If it is, you may need to reprogram your key fob to your vehicle

4) The old car battery reset trick
I know this sounds absurd, but it works sometimes and is worth trying. If you exhausted all of the options above, disconnect both terminals on your car battery for 10 minutes. Then reconnect them and try your key fob. This has worked for many people and I have no idea why. If you do, please comment below to explain.

5) New fob!
It might be time for a new key fob! No need to dread over the expensive costs of a new key fob, at Keyless Entry Remote Fob Inc., you can get a refurbished one for a very affordable price! You won't even be able to tell the difference. Just search your vehicle make, model, and year to purchase a key fob or give us a call at 402-671-5100.

Fords "better idea"...go to an automotive stereo shop that does keyless entry install for around $89...it's the cheapest way to go anyway. Dealer will have to reprogram the FOB, you're looking at $100+

You may have to car to Chevy Dealership to reprogram keyless entry.

you can take it to a dealer and they can reprogram it for you.. good luck keith...

Regarding the remote transmitter issue: Take the remote transmitter to your Toyota dealer. Ask them to test your transmitter with their hand-held RF detector. All Toyota dealers are required to have one of these devices. The RF detector will test the remote to see if it is indeed transmitting the proper RF out of the transmitter, and the strength of the RF signal. If there is no signal, the remote has failed (unfortunatly common), and the remote will need to be replaced and reprogrammed to the vehicle. I do this quite regularly, and rarely do I tell customers taht they need to spend 800 dollars for such a simple diagnosis/fix. The keyless system is very reliable. I rarely change the ECU for the keyless, unless somebody somehow gets the ECU wet, then it def needs replaced. Hope this helps.