Wiring diagram for central locking

http://www.mb4x4.co.za/forum/content.php/54-W460-230GE-Gelandewagen-Central-Locking-Repaired

If this is the same as this like my 1988 G.. then basically there is a master in the door which is as shown in the photos. This has a microswitch to detect the driver moving the key/shaft and that fires one of the two relays (for lock or unlock). The master cannot lock/unlock.. only detect the key movement. These are then daisy chained through each door starting at the passenger front and ending at the rear door where each one is a Slave that can move the rod/key but cannot detect key movement. By daisy chained I mean that the wire goes from driver's master box to the slave box inside the passenger door.. and then connections from this box on separate connections then go to the next door.. and if anyone of the links are broken then everything from that point onwards fails to work. I might have scribblings of what each master + several slaves do in terms of wiring as I ended up fitting another slave to the drivers door so that I could wire it to a wireless remote/alarm system which I have still not done.. I think there maybe a connection relay/controller somewhere in the dash (maybe to side of glovebox on inside of A pillar?) but then as I described the circuit there would be no need; that was/is my problem as I cannot easily find where to break into the circuit to fit my alarm relays to work it wirelessly.

There will also be a light on the instrument binnacle that flashes when the central locking changes function.

Parts in that system are;

A003 820 3242 = Slave/passenger central locking actuator = 73 Euro

A003 820 4910 = switch/driver central locking actuator = 180 Euro

A 001 545 35 15 ANZEIGELEUCHTE 8,79 € 10,20 € central locking lamp holder on dash

No idea about any alarms being fitted to G's. Not seen in my limited experiance. To fit one to the system as described would not be easy and most alarm folk would have just fitted their own set of locking motors rather than work out MB's old fashioned system. That link guy had the occasional failure issue and thought it was his micro switch or the circuit board getting moisture. The fuse board is bad.. retension all the legs by bending them in, clean all the fuses, try to get copper not aluminum fuses .. they are a bit grim!

I assume I am looking for A0038204910 actuator for divers door 230 ge 1988

Many thanks for the information. Most but not all of my alarm has now gone some wiring still remains.

The actuator sends a signal but it is "not long enough" to fire the other doors. Where was the earth situated so I can get it checked.

Many thanks for the directions. I have found both earth points and both were ok. It looks like trying to repair the actuator or a new one.

On the subject of central locking I think most 80's Mercedes had the vacuum type system with a pump. Was th G alone in having an electric system? 

All G's use electrically operated Central Locking with electric powered Actuators

The 460 and early 463 are both Electric although slightly different in how they work

Never seen a Vacuum operated Central Locking system on a G

The 460 uses a electric Master Switch to operate the Drivers Door, this then fires to 2 (SWB) or 4 (LWB) Slave Actuators

The 1 (SWB) or 3 (LWB) Side Doors all being the same with the Rear (Tail) Door different (just in shape)

The Central Locking on the 460 was always an optional extra i believe

Master A003 820 49 10 x1

Side Slaves A003 820 32 42 x1 or x3

Tail Slave A003 820 33 42 x1

Central Locking on a 463 on the other hand was standard equipment

The 463 uses a small ECU as the Master located in the Fuse / Relay under dash area to fire the Slaves

Front and Tail Slave (SWB) A004 820 24 42 x3 (ALL)

Rear Slave (LWB) A004 820 25 42 x2 (LWB)

The common issues when 460's fail it is often an earth issue or sometimes a break in a wire between Master and Slave. Check that there is a power feed to the Master, if not nothing will happen, if the Master has power then check power to each Slave in turn as the system is fired, wiring issues between Actuators are common. If the Master fails none of the others will work, if a Slave fails just that Door will not work.

You can track and trace wiring issues simply with a multi meter, if you have nothing working after that suspect the Master providing it has a power feed, if just one or 2 doors don't work suspect the Slave Door Actuators are faulty or seized, see below, not uncommon for more than one to fail with age.

The common issues when 463's fail is usually just the Slave Door Actuator going down, but wiring issues can happen.

Another common issue for all models is lack of use and the Mechanisms for the Door Lock or Actuator seizing up. These can often be removed and freed up and lubricated. Just because it does not work, does not mean the Actuator is faulty, if the Mechanism is seized or very stiff the Actuator will not move it, it does not take much resistance!

Remember you may also have a chance to swap out a faulty Actuator, for example 463 Front and Rears will swap side to side as will 463 Front and Tail. 460 Passenger Front will swap with the Rears if it's a LWB etc.

As for all the 80's and early 90's MB models, as far as i can remember they all run Central Locking that was Vacuum operated thru Vacuum Actuators and a Vacuum Pump usually in the boot area or under the rear seat.

Certainly W116 W126 C126 W140 C140 W201 W202 S202 W123 S123 C123 W124 S124 C124 W210 S210 R107 C107 R129 Etc...

Obviously both 460 and 463 models do have a Vacuum system with a Vacuum Pump on the engine of diesels or an Inlet Manifold feed for petrol engines, this in the main provides Vacuum for the Servo function on the Brakes. Both models have a large Vacuum Reservoir under the left front inner wing for this purpose. Automatic models also use Vacuum for some parts of the shift and gear control etc.

Hope that helps

Gav

  OK GAV I STAND CORRECTED 

Isn't that the way it is supposed to work, so you can unlock the rear door to load or unload luggage whilst the rest of the car is still secure.

My 460 (SWB) locks the passenger and rear door correctly, but only opens the rear door (this by turning the key in the drivers door) - it will not open the passenger door from the drivers door key turn.

From what Gav is saying, would this mean that earth and power are OK? But removing the slave from the passenger door and giving it a bit of a clean and lubricant should bring it back to life?

If so - is it "fairly" easy to remove and replace?...