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Discussion Starter #1 (Edited)
Mercedes Wiring Diagrams, Technical Schematics, Tips & Tricks

Hi Guys,

I thought I would start ANOTHER THREAD! ;)

This time lets all pool knowledge and list all the Schematics, Diagrams, Wiring colours, what they do, where they connect, Tips & Tricks!

I do hope this will be another useful thread and a useful resource, and to start it off with, I have attached a document which shows the Mercedes 'SPEED PULSE WIRE/CONNECTOR' this is useful when someone has speedo faults and when people want to upgrade their equipment, say if they wanted to install a fixed Satellite Navigation head unit or similar.

Regards
SARGE
 

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Discussion Starter #2 (Edited)
Service Indicator Reset (Cars/Vans with ASSYST) not for V280

Resetting the service computer (ASSYST)

Hi,

* Turn the key to position 2 in the ignition lock and immediately press the 'km' button twice briefly

* Within 10 seconds, return the key to position 0 in the ignition lock.

* Keep the 'km' button pressed, Turn the key to position 2 in the ignition lock. Keep the 'km' button pressed for a further 10 seconds.

* The current remaining distance/remaining time is shown.

* After about 10 seconds an audible signal sounds and the new remaining distance/remaining time is shown for about 10 seconds.

* Release the 'km' button


Hope this helps
SARGE
 

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Discussion Starter #3 (Edited)
CHECKING ENGINE OIL LEVEL (Cars/Vans with ASSYST) (not V280)

To check oil level from the comfort of your dashboard:

Stop the engine and wait for 5 mins after engine is at its normal operating temperature.

The vehicle must be on a level surface when the oil is checked.

* Turn the key to position 2 in the ignition lock and wait approximately 10 seconds until the 'oil symbol' appears in the multi-function display.

* Briefly press the'km' button twice within 10 seconds.


If the oil level is ok then a message of 'oK' will be displayed.

If the message 'HI' is diplayed then you must drain excess oil.

If the message is - 1.0L , - 1.5L or - 2.0L (the 'L' meaning Litres) then you must Top up the oil with the amount displayed


SARGE
 

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Discussion Starter #5
lilstar said:
hi sarge does this also apply for V-230 TD

Thanks
Hi, It applys to all vehicles with (ASSYST).

What does the instrument/clock panel in your van look like?
I have attached a picture of my dash if it is the same then as I understand it, it will work on your V 230 TD.

Hope this helps
SARGE
 

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Discussion Starter #6
Hi I thought I'd scan some parts of my Manual and put it here as I get loads of PM's for Help.

Hope it helps guys...:D

THE ASSYST COMPUTER
 

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Hi Sarge,

I wonder if you can help me? I have noticed that my digital dash no longer lights up when I open the front doors, I am also having trouble with the interior light, it doesn't come on when opening the front doors but the map reading light/constantly on will work when moving the switch.

Do you know if the dash and interior light are connected together somehow? It seems strange that they should both stop working at the same time.

Thanks for any help.
Benz Bling
 

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I have a similar problem.
There are two sources that causes my problem and one or both might be same as yours.

1: The switch on the passenger door is malfunctioning and will be replaced.

2: The cable that runs between the door ánd chassi is broken. Not all cables whitin that cable is broken but some of them are. The result of the broken cables is that the interior light sometimes come on (but not always), the electric window on driverside doesnt go up (down works) and som directions of the electric mirrors wont work.
When the weather becomes better i will grab a soldering iron and replace the wiring.

/Johan
 

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Discussion Starter #11
Benz Bling said:
Hi Sarge,

I wonder if you can help me? I have noticed that my digital dash no longer lights up when I open the front doors, I am also having trouble with the interior light, it doesn't come on when opening the front doors but the map reading light/constantly on will work when moving the switch.

Do you know if the dash and interior light are connected together somehow? It seems strange that they should both stop working at the same time.

Thanks for any help.
Benz Bling
Hi as per the PM here is the pics mate :thumbsup:
Clean the metal parts of the switch where the contact is made to complete the circuit, also note the condition of the screw hole in the pillar as that is also important as it supplies the Negative connection.

What I have noticed is that in the Instrument cluster the needles seem to jump to a 'ready to operate position' lining up to the zeros on their scales which also seems to be linked to the door light circuit.

I hope this helps mate :thumbsup:

Oh sorry about the quality of the pics as its cold and dark out there :eek:




Sarge
 

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Discussion Starter #12
Glow Plug Removal

As several of you on this forum have experienced, and the same question seems to arise in the PM's to me, I thought I'd put it here.

My advice is, if you need to remove the glow plugs, then you should start the engine and get it to working temperture, which is about 90 degrees or half way on your temperture scale. This then should allow easier unscrewing of the glow plug from the 'locked' tight position, and will lessen the risk of it snapping in the head.
Sorry, but while the above maybe obvious to some it isn't to others, who are less experienced.

Don't forget to be careful as there will be hot area's around so don't say I didn't warn you...LOL....:)


Hope this helps Lads :thumbsup:
 

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Discussion Starter #14 (Edited)
3 questions - 1: where's the fuel pump located (can't hear it priming or running), and 2: are these vehicles self priming and if not, what to do; 3: where's the fuel pump fuse located, the manual shows a completely different fuse setup to the one on the vehicle?

1, For the diesel V220 it is as in picture below.

2, These ARE self priming and the method is: Refuel vehicle, bleed the system by turning the starter motor for up to 60 seconds without interruption until the engine is running smoothly.

Note: If the tank has been run dry, there is no guarantee that the engine will start up immediately after refuelling as air may still be in the fuel system.

3, As I understand it, there is no fuse for the fuel pump in the diesel engine because it is mechanically operated by the engine, the fuse 'f22' is for the fuel pump in the V230 & V280 models (Petrol).


P.S. there is 3 fuse boxes in this vehicle 1 under steering column, 2nd under dash in passenger footwell and 3rd under the passenger seat.







 

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Discussion Starter #15 (Edited)
Autobox 'Park Lock' Lever 'Stuck' Mechanism fix

Hi all, Last year I had experienced the autobox refusing to come out of 'Park' and I ended up handing over my baby to the MERCDADS, the totally incompetent Mercedes Stratford London. They had it 2 days, 'told' me that they had replaced the ENTIRE lever mechanism, and returned it to me, at collection I tested it and it was the SAME. I was told the all mechanism had been replaced, they scratched the wooden dash, broken the wiring for the tv system, and broken the cup holders, to which they rammed a 'screw' into the rear to 'jam' the cup holders into closed position...SENIOR TECHNICIANS THESE, that were let loose on my baby :mad: .... and you wonder why I hate them so much eh?!

Anyway..sorry got a little side tracked there....:)

After experiencing the same problem SURPRISE SURPRISE, immediately, after, of the gearbox refusing to release out of park, which is usually associated with a 'Click' (the activation of the 'Solenoid') when the ignition/engine is on and the brake pedal is pressed. When there is no 'click' then the lever refuses to move out of 'Park'. :( I decided to have a look into this myself. :)

There is a little 'Microswitch' which is located in the top left hand corner (see pics). This is switched by the positioning of the cam which obviously turns dependant on where the 'Lever' is positioned from 'P' down to '1'.

What I have found is that the microswitch has a little arm on it and this sits on top of the 'cam', which has a little raised 'lip' on it. When the cam rotates into the park position, the raised lip hits the lever on the microswitch thereby activating the switch, which in turn activates the 'Solenoid'.

Now when this switch has either dislodged itself, (this is easily done due to the crap design of the mountings, this has no clips or screws, but simply slots inbetween two little pieces of flimbsy plastic) or it has become oxidised it simply doesn't 'make' therefore the result is that the 'click' doesnt take place and the lever is not released by the 'Soleniod'
(the click is caused by the operation of the soleniod)

To fix this:
1, Check that the switch is fitted in the correct position and not become dislodged
2, Check the 2 wires to the switch haven't broken off
3, Manually operate the little lever on the switch.
4, If this doesnt work then you can just 'short' the two wires to cause the solenoid to operate, if this causes the soleniod to click (don't forget to have ignition on and foot brake pressed) then this switch will need to be replaced, this is a generic part so go down to your local electronics parts shop and buy it for a few pence as opposed to getting ripped off by the Mercdad stealership, whom no doubt, will be rubbing thier thieving hands with glee.


I hope this helps you.

SARGE :thumbsup:
 

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Hi sarge, I've got a C250 turbodiesel 1998 and have intermittent electrical fault. The fwd interior light, wipers and indicators stopped working. Is there a common relay and do you have a wiring diagram for my car?
 

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Discussion Starter #17
garyboz said:
Hi sarge, I've got a C250 turbodiesel 1998 and have intermittent electrical fault. The fwd interior light, wipers and indicators stopped working. Is there a common relay and do you have a wiring diagram for my car?
Check your PM Mate.
 

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Hi Sarge. I've just got myself a 2001 108cdi and the instrument cluster lights have stopped working. I know that funtion buttons (km/clk +/-) buttons function as I can change the display and adjust the time.

Any ideas, as so far I have only been able to locate a fuse box under the passenger seat (right hand drive here is Australia :) and all the fuses within there are intact ?

Any help will be greatly appreciated.
 

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Discussion Starter #20
mr_v8 said:
Hi Sarge. I've just got myself a 2001 108cdi and the instrument cluster lights have stopped working. I know that funtion buttons (km/clk +/-) buttons function as I can change the display and adjust the time.

Any ideas, as so far I have only been able to locate a fuse box under the passenger seat (right hand drive here is Australia :) and all the fuses within there are intact ?

Any help will be greatly appreciated.

Hi mate, Please see your PM :thumbsup:
 
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