Electrical fault on 2003 CLK320 convertible w209 where do I start?

Isaiah

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Hi everyone, finally signed up been going through these forums offline for so long thought it's about time.


I've just bought this mercedes clk320 convertible, with a gearbox issue, which has now been resolved. However, all these electrical issues have come up on their diagnostic which I need to go through and attempt to sort out. Where do I start, could one thing be linked to another? I've uploaded photos of the diagnosis.

Only owned this car less than a week I bought it as a project hopefully ready to enjoy it in summer.
Things that don't work so far I've noted:
Sports button on gearbox clicks but does nothing, Seat belt doesn't retract, driver's seat adjustments doesn't work, front parking sensors come on randomly under harsh braking, SRS light is on, haven't tried the roof yet, seat belt light comes on and beeps away although it's on, windows are temperamental.

Going to go through all the fuses tomorrow. Any idea what I should replace first or where to start. 2adae1bf-15a8-4154-ac00-d594633aec54.jpeg a89ff724-caa1-48df-8ff4-a719ecdf7998.jpeg d086de86-e01c-4312-9cd8-c35a03a3ba4d.jpeg
 

bigasotonuk

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Hi,
Referencing you're diagnostic read outs.
The read outs you have shown are just a list of control units and not the specific fault codes.
You need to clear all the fault codes to see which ones are current rather than stored.
You will need to look at each specific control unit clear all codes and see which ones do not clear, these are the ones which will need to be looked at to establish what issue you have.
 
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Isaiah

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I thought all my modules were toast... The garage didn't actually give me the fault codes so I'm going to have to go back and ask for the specific current codes.

Cheers
 

sonic

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I thought all my modules were toast... The garage didn't actually give me the fault codes so I'm going to have to go back and ask for the specific current codes.

Cheers
You are going to have to buy a fault code reader to resolve those issues. The garage should have deleted all the error codes.
A iCarsoft MB V2.0 is a good one.
 
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Isaiah

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b7302779-1adf-45ca-bb64-92ce8f2c3d70.jpeg Yes they have photo below. So guess I'm going to go buy the code reader before starting anything, I'm going to check that out sonic cheers. Hopefully it's just fuses or relays, because the guy I bought it off had it parked up for a while so I have a feeling he might have jump started it..... Fingers crossed it's nothing major.
 
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Isaiah

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I've just ordered the Icarsoft mb v2... thankyou for the recommendation Sonic
 

Tony Dyson

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Start off with your battery/ies, you're aiming for a healthy 12.6v without the engine running and around 14.8v with there are a lot of modules that don't like undervoltage weak batteries and don't ever try to boost charge batteries connected to your car with more than 14.8v.
 
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Isaiah

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Start off with your battery/ies, you're aiming for a healthy 12.6v without the engine running and around 14.8v with there are a lot of modules that don't like undervoltage weak batteries and don't ever try to boost charge batteries connected to your car with more than 14.8v.

Thanks Tony, as soon as I get the diagnostic delivered, I'm going to check the voltage.
 

mattkh

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Put the batteries on a slow charge while you are waiting.
 
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Isaiah

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*Update* just got my new Icarsoft tool today. Carried out a voltage test... 11.5v engine off, 13.7 engine on (Tony dyson cheers for the voltage numbers to look for) . So I will be putting it on charge Mattkh to see if it sorts that out before replacing battery.

I went through all the modules cleared the codes now wait too see if anything pops up again. The two photos show codes that would not clear so I need to sort that out for starters.
 

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Isaiah

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New battery, couple of fuses sorted everything right out. It's funny how a little drop in voltage plays havoc with these cars. As for the SRS light, it was a ignition squib under the rear passenger seat, I gave it a little wiggle sprayed some contact cleaner, cleared the code sorted it right out. Icarsoft helped me pinpoint it brilliant little kit. Thanks everyone for your help.
 


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