Hi, i have a mercedes benz cl 600. recently, the keyless entry remote won't work on door, there is a guy told me that, the problem is vacuum pump failure. how i check it, or yhere is other issue cause that. thanks in advance

dead battery in fob or need to reprogram fob or system failure

Hi
If the remote still working it self probably needs synchronizing,
to do so, turn the ignition ON,then turn the ignition OFF remove the key.
within 1 minute press and hold the lock button, press unlock button 5 times while you still holding the lock button. test the remote.
Good Luck

Go on youtube and put in how to reset your car key after renewing key fob battery good luck colin

Usually need a new battery

YOU NEED NEW REMOTE BATTERY.THE DEALERSHIP HAS TO REPLACE BATTERY AND REPROGRAM REMOTE.

If the remote batteries are low the car will tell you on the information center by the speedometer. The door handle on the keyless entry is malfunctioning. You must replace the door handle. It usually cost around $160 plus shipping cost. Sometimes the contacts within the keyless entry become corroded or broke. Nevertheless, you need to replace it or have someone replace it. There is one screw behind the weather scrip that holds it in place. You will need a torex wrench to remove it.

Hi ............. You need a new arial and booster......... common problem.... Arial and booster for keyless entry is at the back of the roof under the headlining next to the screen..... get a dealer to fit and initialise...... Hope this helps......... Steve ..... Mercedes Benz.... Botswana

Hi.

To program ( or reprogram ) a keyless entry remote transmitter into the remote keyless entry module, perform the following steps:

1. Turn the key to ON or ACC and short the two terminals of the program connector, a two-pin connector located below the driver's side of the instrument panel at the base of the steering column. All doors should lock and then unlock.
2. Press any button on each keyless entry remote transmitter in turn. All doors should lock and then unlock. If the door locks do not respond, press the button again (up to three times maximum with the same keyless entry remote transmitter). If the door locks still fail to respond, go to Pinpoint Test A.
3. Repeat Step 2 to program additional keyless entry remote transmitters into the remote keyless entry module (up to four keyless entry remote transmitters maximum).
4. Turn key off.
5. Remove the short from the program connector. All doors should lock and then unlock.
6. Verify that the keyless entry remote transmitters have been successfully programmed by pressing the LOCK or UNLOCK button on each one, and observing that the system responds by locking and/or unlocking the doors.


I hope this helps you.

Thanks!

Check Battery in car(make sure is not weak or dying), check battery in remote fob, possiable draw in system possiable fuse or possiable keyless entry module failure

REMOTE KEYLESS ENTRY BATTERY IS WEAK OR DEAD.YOU HAVE TO LET DEALERSHIP REPLACE KEYLESS ENTRY AND REPROGRAM IT TO UNLOCK OR LOCK DOORS.