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I am hoping to test a couple of switches tonight in search of resolution to the issue of my roof not going up / down.

Having watched a video on testing the switch with a multimeter and having a basic understanding of how they work - I am wondering if the switch could be 'bypassed' without actually removing it (saving a ton of time removing all the boot trim when removing, for example, the trunk cover valance).

My idea is that I would just unplug it, and then bridge the 2 wires from the plug emulating a closed position on the switch. In the case of the trunk cover switch this would save everyone a ton of time checking it in future - meaning you only have to pull all the trim out if you know the switch is the culprit.

Anyone tried this or have any warnings / suggestions as to why this might not be a good idea?

Thanks!
 

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Discussion Starter #4
Ok switch is fine so pulled out the control module

Upon opening it up I notice something sounds like it is loose / broken off inside one of the relays - I assume this is not normal?

The rest of the module looks good - no sign of water or moisture damage and the pins are all clean.

I was saddened to see that many of the connectors in the control module housing are damaged - clearly by brute force and lack of understanding how to disconnect. I think the wiring is intact but the plastic on them has been broken off.
 

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Upon opening it up I notice something sounds like it is loose / broken off inside one of the relays - I assume this is not normal?


Not normal, no, but it depends on what exactly is rattling. The good thing is that you can (usually) replace a relay. Have you a photo of the relay showing its make and details? It may be we can find a replacement that will be cheaper than buying a new control module.



I was saddened to see that many of the connectors in the control module housing are damaged - clearly by brute force and lack of understanding how to disconnect. I think the wiring is intact but the plastic on them has been broken off.

This is a shame as there is a possibility that the connectors are now weakened and you should try not to exert any omre pressure than needed to connect/disconnect the module - also only disconnect/reconnect when you really need to.
 

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Discussion Starter #6
Thank you @savcom

Since I posted that a few things have progressed.

I looked up the relays and discovered that they are replaceable and then realised I had a GM3 module in my garage which had a few in it too. I found that those made a rattling noise too - or at least possibly a couple did. Perhaps this is what happens when they reach the end of their lives?

Anyway - I tried to remove them but without a solder wick I wasn't able to so in desperation I ordered a used roof control unit off fleabay which arrived the next day. The replacement also made the same rattle noises so I am starting to think it's possible this is normal - however to confirm I need to remove all the relays and listen to each to be sure as all 3 modules I have are 20+ years old. I plugged in the replacement and nothing changed - roof still does not work.

In the background - I have been exchanging emails and getting customised updates from iCarsoft who are trying to help me get my V2.0 MB scanner to read roof codes which they said it would. I must say they are fantastic about it and super helpful.

This weekend I am going to remove the 5 identical relays off the old BMW GM3 module I have and then see whether all 5 rattle when moved around and check them with a multimeter.

Buying an SLK with a roof that doesn't work has felt like a really daft exercise I must admit - but the thing keeping me going is the condition of the rest of the car, it's just too good to give up on although I am getting to that point.
 

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Hi,

It is not a good idea to link out any Micro-switches, except perhaps the Roller Blind one for testing purposes only.
Any of the others linked can and do cause damaging collisions between moving parts like Roof and Trunk Lid if they do not switch at the correct time.

Do yourself a favour, iCarsoft does not, (and to my knowledge never will) access VR and around 10+ other modules on the R170 all of which systems can and do give trouble on these cars :wink:

The folks you are speaking to do not understand why "they just sell boxes with stuff in" with exaggerated Sales blurb advertising !!

Find someone who has SDS it will give you live data on all switches and quickly get you to the root of your problem.

Better still, dare I say it, if you are a keen DIY'er, buy a circa £400 SDS system :wink:

On this particular problem it could well easily pay for itself if you end up going to a Dealer or Indie who just chucks expensive parts at your Car, and will always retain it's resale value should you move away from MB Cars in the future, a used and proven working system can command a decent price on EBay etc ;)

HTH, Cheers Dave
 

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Discussion Starter #8
Hi,

Do yourself a favour, iCarsoft does not, (and to my knowledge never will) access VR and around 10+ other modules on the R170 all of which systems can and do give trouble on these cars :wink:

The folks you are speaking to do not understand why "they just sell boxes with stuff in" with exaggerated Sales blurb advertising !!

@Dave20302 really appreciate your input! I have had a look and can't see any SDS for sale in UK, let alone at that price. I'd certainly look at investing in one I must be honest.

The iCarsoft has been great and it does access the VR and has successfully reset a number of codes in other modules like TCM after I replaced the conductor plate. I have been sending them log files and we have been making progress and I am willing to continue for a little while longer with them as ultimately it will benefit anyone with an MB from this era.

Will have a play around with relays and see if that doesn't help my situation - failing that will start investigating SDS or equivalent. If I get time I may try removing boot trim to check the mirroswithces on either side of the boot.
 

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Hi,

Apologies but I don't have the time to keep typing out the same stuff as I am very busy, especially right now ;)

However I can assure you that iCarsoft and many others DO NOT access VR, what you see on the screen is the machine trying to access it, then the heading disappears because the machine simply cannot communicate with that module !!

We proved this but a few weeks ago, @Bartiny put up a really good Video of his machine doing a scan, I have just spent 15 minutes searching for that post but cannot find it, hopefully @Bartiny can help locate it .................

In actual fact, the iCarsoft will only access 5 Modules, ENGINE, TRANS, ABS, AIRBAG, and I believe a partial access to INSTRUMENT CLUSTER possibly for service indicator resets, that is it !!

Depending upon exact Model Year and Options, the R170 has around 17 Modules in total.

These include but are not limited to VR, ATA, PSE, RF / Immo, CCM, HVAC etc etc and all of these systems can and do give trouble that requires access to Live Data as well as Codes, and also when replacing parts, Version Coding is often needed.

Only SDS or very very expensive (£1500 upwards Professional Machines), will do some of this but not all of it :wink:

Here is a link to just one such SDS in UK, you may need to buy the 38pin lead as well depending upon your model year, that lead is not that expensive especially if you ask to buy one at the same time .........................

https://www.obdstore.co.uk/product/mb-star-c3-mercedes-diagnostics-system/

HTH, Cheers Dave
 

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Hi,

I don't have the time to keep typing out the same stuff as I am very busy, especially right now ;)

However I can assure you that iCarsoft and many others DO NOT access VR, what you see on the screen is the machine trying to access it, then the heading disappears because the machine simply cannot communicate with that module !!

We proved this but a few weeks ago, @Bartiny put up a really good Video of his machine doing a scan, I have just spent 15 minutes searching for that post but cannot find it, hopefully @Bartiny can help locate it .................

In actual fact, the iCarsoft will only access 5 Modules, ENGINE, TRANS, ABS, AIRBAG, and I believe a partial access to INSTRUMENT CLUSTER possibly for service indicator resets, that is it !!

Depending upon exact Model Year and Options, the R170 has around 17 Modules in total.

These include but are not limited to VR, ATA, PSE, RF / Immo, CCM, HVAC etc etc and all of these systems can and do give trouble that requires access to Live Data as well as Codes, and also when replacing parts, Version Coding is often needed.

Only SDS or very very expensive (£1500 upwards Professional Machines), will do some of this but not all of it :wink:

Here is a link to just one such SDS in UK, you may need to buy the 38pin lead as well depending upon your model year .........................

https://www.obdstore.co.uk/product/mb-star-c3-mercedes-diagnostics-system/

HTH, Cheers Dave

Hi Dave, unfortunately I deleted it off YouTube as it was misleading to anyone searching YouTube for information on Autel 802 as used on the R170.

I could scan again and upload it (for a short time) if you wish.

Cheers
Graham
 

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Hi again,

one last bit of help for now, there is 2 Micro-switches, one in the Boot Lid Latch, and one on the end of Ram under the "Rear Parcel Shelf", right side of Car, these are the 2 that I have known to give trouble both on my own Car and also those of my Customers :wink:

Hi @Bartiny, aha, that'll be why I couldn't find it then :grin:

Best ask Myk, @Avel Du first before re instating,

HTH, Cheers Dave
 

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Discussion Starter #13
Thanks @Dave2302 - I am not going to ask you to repeat anything - but I think that working directly with iCarsoft and their developers we may well find that we can access the VR module whereas yes you are correct currently they cannot. It is just software after all so I do not necessarily agree that it will never work. I will spend a bit more time with them but if they don't find a way in the next few tries I will put it to bed and report back.

Thanks for the link - I may well try that. I have a number of 38pin adaptors now so that could work out well!

I do have an Autel 802 as well which I know does not work either.

Thanks for the heads up on those 2 microswitches - I will test them today assuming I can find them.
 

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Hi Dave, unfortunately I deleted it off YouTube as it was misleading to anyone searching YouTube for information on Autel 802 as used on the R170.

I could scan again and upload it (for a short time) if you wish.

Cheers
Graham
Pretty sure mods didn't delete.
Members user vids aren't normally removed unless they infringe the rule.
eg copyright, porn, sales etc

By all means repost it and we can review.
 

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Pretty sure mods didn't delete.
Members user vids aren't normally removed unless they infringe the rule.
eg copyright, porn, sales etc

By all means repost it and we can review.
I deleted the video off YouTube myself @Avel Du :grin: as I thought that it was misleading to anyone searching YouTube for information on the Autel 802 and the SLK R170 0:)

I would be willing to post another (very high budget :laugh:) video of it scanning my R170 but as I have read since the OP says he is already aware of 802 not being suitable.

:wink::wink:
 

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My two penneth worth ..

I thought the diaglink/802/805/808 could read the VR? Problem with the pre FL being that it needs the extremely-hard-to-find genuine Autel (not generic) 38pin cable? I have the iCarsoft MB II (not v2.0) and that knows the VR module is present. (full stop.end of. same for a few other modules as well - it knows they are present) - at a guess would work well with R171s and above. DAS 2 vs DAS 3 or something techie.

And this thread is going way off topic again lol

First Q. that should be asked on any non-working roof is: 'is there any lights on on the dash?' ESP, BAS etc.

EDIT
I'll amend that to 'amongst the first questions to be asked' .. along with how good is the battery?, any difference with the engine running?, is the luggage cover pulled back and in place? what is the light on the roof switch doing? is the pump running? any fluid in it? ..
 

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Discussion Starter #17
My two penneth worth ..

I thought the diaglink/802/805/808 could read the VR? Problem with the pre FL being that it needs the extremely-hard-to-find genuine Autel (not generic) 38pin cable? I have the iCarsoft MB II (not v2.0) and that knows the VR module is present. (full stop.end of. same for a few other modules as well - it knows they are present) - at a guess would work well with R171s and above. DAS 2 vs DAS 3 or something techie.

And this thread is going way off topic again lol

First Q. that should be asked on any non-working roof is: 'is there any lights on on the dash?' ESP, BAS etc.

EDIT
I'll amend that to 'amongst the first questions to be asked' .. along with how good is the battery?, any difference with the engine running?, is the luggage cover pulled back and in place? what is the light on the roof switch doing? is the pump running? any fluid in it? ..
That is quite a coincidence and thank you for bringing this back on topic :)

The car has ABS light on and when I picked it up said Right rear abs / speed sensor. I have now replaced both and now getting a code for the cam shaft position sensor? Neither my carsoft or autel seem to be able to reset the abs faults though... could abs / asc lights be related to roof?
@M4rCu5
 

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Hi,

All very good points above :)

My final 10p worth ................

A lot of 38 pin Cables out there, but you will need the specific one to work with the MB Mux.

Don't forget, these type of aftermarket machines will only get 80% of codes in the Modules that they see, so even if it says "No Codes" I would still be cautious of going off on a "red herring wild goose chase", SDS of course gets 100% of everything in 100% of modules ;)

Even if the Autel / iCarsoft does get to read and reset 80% Codes in VR, (which I seriously doubt as these modules require HHT Win to acess), they will still very likely not get Data on Micro-switch states ................

Microswitch Faults are hard to diagnose without a lot of stripping out of trim, all of which is un necessary except for the piece of trim related to where the actual faulty switch resides ;)

Micro-switches don't always flag a code.

SDS will show you the states of switches in "Actual Values", and as you manually fold the roof you can see the states of the switches change from open to closed or vice versa.

There is a Forum Sticky on VR which will tell you what sequence and state they should be at if you don't already know that.

HTH, Cheers Dave
 

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Discussion Starter #19
Sorry @M4rCu5 just saw your edit I must have seen your first reply too soon :)

So - when I bought the car it had these known issues:
Non-working roof, ABS and ASC lights on dash, MAF code coming up (although drives and idles beautifully).

Battery is strong and I have had it connected to my reconditioned for 48 hours so it's practically new again. Running engine makes no difference. Fluid level on pump is fine.

I have replaced both rear ABS sensors. Lights on dash remain lit and I am trying to clear the codes although in past experience with my BMW's of similar age these should go on their own if the fault is gone?

My issue with roof is: (yes luggage cover closed and that switch has been tested as OK)
Pull back switch with foot on the brake and the switch light flashes. Nothing happens at all. Push switch forward and everything tightens up as if finishing the close procedure and if for example, the windows are open, they will close.

So I open the roof manually and then press close: nothing - just flashing light. If I press the switch to open, then the rear quarter windows drop and everything locks up as it would when completing the open procedure.
 

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Discussion Starter #20
A lot of 38 pin Cables out there, but you will need the specific one to work with the MB Mux.
Thanks again @Dave2302. I have several connectors - one of which was a red connector to go with the Carsoft scanner and was £50 where many can be had for £10 or so. It did make all the difference. I doubt though that it will be some kind of swiss army knife and work with everything though...
 
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