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Wire Diagram Questions

Dikfrik

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#1
Gents


Can someone perhaps shed some light on the codes on the wire diagrams as marked on the attached. Does it refer to the wire colour and is the number the wire gauge?

I have the explanatory codes for all the switches and relays but none on these codes. Is there perhaps a list of what each mean?
Elec codes.JPG
 

Andrew

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#2
Yes you are correct
rt is rot is red
sw/rt is schwartz rot ie black red ( the first colour is the dominant and the second normally the stripe and if a third colour it is normally dotted along the length of the wire.
rt gr is rot grün is red green
sw is schwartz or station wagon in English. Ok, it is black

The number also in attendance refers to the wire cross sectional area in mm2.
 

Dikfrik

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#3
Dankie Andrew! alhoewel hier by ons is die rotte bruin..:)

Another question - the numbers on the relays, swithches etc - are they marked as such in the vehicle - i.e how do i find the equipment or instrument referred to on the diagram? (not really a drawing is it?)
 

Andrew

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#4
Normally yes, but only to a degree, depending on lables falling off etc. what is helpful is all junctions and plugs are also indicated eg from above plug X15 terminal 3 has 1mm black wire with red stripe fed by bridge from terminal 18 of fuse 9

Etc etc. but I am sure even Willem has worked that much out?
 

Dikfrik

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#5
Eishh rather give me a rebar drawing.. Willem? No i think he will eat the diagram before he understands it but he might be good at stripping the wires if needed

Thanks Andrew i will give it a bash
 

Dikfrik

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#6
Another question - is their a diagram to show what relay is sitting where? - all the relays are on the fuse box diagram but it does not show which is which as fitted in the car?
 

Andrew

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#7
Is it not in your owners manual?

Are the units not marked as per the wiring diagram?
 

Andrew

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#10
Freek, please can you find what else shares the ITC warning light apart from intercooler water level.?.

I changed my steering wheel and disturbed the airbag and now it is on.
 

Andrew

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#12
I have removed it also in the past without issues. When I replaced the steering wheel I used stronger locktite than the factory did. I needed violence to get the wheel and nut off. I "disturbed" the air bag wiring!

The light comes on with the ignition only, not with key out.
 

Dikfrik

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#13
Andrew apologies from my side - I did miss the question about the charge air warning light - did you get it sorted?

I also have a question for the electrically minded. Please refer to the attached wiring diagram on the "engine off cooling system" on my 290GTD
On my car there is a coolant pump next to the firewall which can pump water through the heater when the hot lever is fully open but it also re-circulates water through the block and head when the engine is switched off and water temp at the sensors just before the radiator inlet is more that 110 degrees, referred to as engine cooling off.

Now the pump on mine did not work (2nd pump over 10 years or so and i replaced it now (the old one definitely got hot with some parts inside warped and melted (the supply wiring is ok so iti is internal heat). The way i understand it the pump must only run when he heater is fully open or if the 110 degree mark is reached but now it runs when i switch the the iginition on.

I further discovered that the solenoid valve on the suction of this pump does not work any more so the pump could run with a closed suction which in my knowledge is a bad thing

Can someone please check the wiring diagram and confirm if the pump should run with the ignition on - I have checked the relay and all seems ok. The part showing the pump running when the temp switch reaches 110 makes sense but the micro switch set-up (it is the switch activated by the heater lever) confuses me. It has three connectors on the top, all connected to earth. If the switch is pressed the middle wire disconnects from earth and voltage is sent to the solenoid valve. can someone also shed some light on how this works?

Thanks in advance!
 

Attachments

Pete460332

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#14
Circuit diagram shows relay positions at "rest" Mercedes says , Coolant pump gets power from terminal #30 which is battery terminal directly - so pump can run when temp > 110DegC and I suspect can only run < 110degC when ignition is on and the coolant circulation microswitch is on. What /where is this microswitch?How is is switched on/off
 

Pete460332

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#16
There are two switches shown in diagram S46/1 and S46/5 . Not sure if there are two physically separated switches or both part of one switch
 

Dikfrik

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#17
To me it looks like the two micro switches are combined in the heater valve switch? I cannot think of another place where there could be a microswitch?
With the ignition on the pump runs regardless of the micro switch position. When ignition is off and the wires at the temp switch is shorted the pump runs. When activating the micro switch power is sent to the solenoid valve which seems to be faulty (no response even with 12V directly on terminals