W202 Central Locking Q

[ukdeveloper]

I have a V reg C240 estate (w202)

For some reason i need to be almost INSIDE my car before the central locking works. Walk 2 feet away and nada!

Is it likely to be the remote battery or something more complex in your opinions?

Also, and this is a slight bugbear... The central locking is a press once for drivers door press again for all the rest. Is there any way to just have a one press opens all?

As i struggle getting into the drivers door anyway it would be great to have a single press opens all doors option.

Cheers

Carl.

 

[Dec]

Press the lock and unlock buttons, simultaneously, for 6 seconds, the Red LED on the fob will light.
You now have what is called global locking, that is, every things unlocks on one press.

Repeat the above if you want to return to Selective locking which unlocks only the driver’s door and fuel flap.

Test your alarm system to se if it is working properly, see… http://www.mbclub.co.uk/forums/electronics/169666-w202-how-test-car-alarm.html

Dec

 

[ukdeveloper]

Hi, Thanks so much for that!

Re Alarm: I don't think i even have one (not had the car for long). Are they fitted as standard?

Carl.

 

[Dec]

The are fitted as standard, if you have the below switch then you have an alarm system, when you lock the car with the remote you also arm the alarm, a Red light on the switch will blink every second while the alarm is armed.

If your car failed the alarm test then you should first remove or unplug the alarm siren, the siren might have something to do with your locking distance problem, normally you should be able to lock from a distance of at least 30 feet from the car.
Change the remote batteries if you don’t know when the were last replaced.

You should then check any fuses that may relate to central locking or the alarm system or the radio, I’m not sure where the fuses are in an estate car.

To retain your theft insurance cover, you should replace the alarm siren, new only, buy only from an MB dealer, the cost about £100 if you fit it yourself.

Dec

 

[ukdeveloper]

The are fitted as standard, if you have the below switch then you have an alarm system, when you lock the car with the remote you also arm the alarm, a Red light on the switch will blink every second while the alarm is armed.

If your car failed the alarm test then you should first remove or unplug the alarm siren, the siren might have something to do with your locking distance problem, normally you should be able to lock from a distance of at least 30 feet from the car.
Change the remote batteries if you don’t know when the were last replaced.

You should then check any fuses that may relate to central locking or the alarm system or the radio, I’m not sure where the fuses are in an estate car.

To retain your theft insurance cover, you should replace the alarm siren, new only, buy only from an MB dealer, the cost about £100 if you fit it yourself.

Dec

I don't see that switch anywhere. Therefore I assume no alarm?

 

[Dec]

Put your VIN (located outside bottom of windscreen, passenger side)number in here… Checking VIN for Mercedes-Benz | CARInfo

Then scroll down the page to see if you see the words ANTI-THEFT/ANTI-BREAK-IN WARNING SYSTEM

Dec

 

[ukdeveloper]

Nope nothing.

 

[Dec]

I’m surprised, it’s unusual to have no alarm fitted to that car. That would have been decided by the original owner when the ordered the car.

If your lack of distance locking problem exist when you lock as well as unlock then it must be the receiver for the RF (radio frequency) signal for the central locking that’s at fault , I’m not sure where this is located in an estate, in a saloon, its in the rear window glass and is called an amp, it picks up the signal for the car radio as well as the remote fob.

Your remote key can also lock/unlock the car when it is very close to the door handle via IR (infrared) that’s why you can still lock/unlock.

Someone else on here may be able to advise where the amp is located on a 2000 estate.

Dec

Edit, Have you checked fuses relating to central locking?

 

[Motorvating]

Have you checked for RF interference? Such things as CCTV, CB radio, cell sites, faulty domestic light bulbs, faulty domestic heating thermostats etc can cause these type of problems. Best way to test for RF interference is to drive somewhere you know other RF will not be present e.g. a country lane, then test your central locking.