getting w210 w208 PSE to work in R170 - Mercedes Benz SLK Forum

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#1 Old 01-24-2014
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getting w210 w208 PSE to work in R170

As some of you have noticed the 2108001148 PSE appears to be close to an exact fit, electrically anyway. There are extra pneumatic outputs that are unneeded in our slk230 R170’s. Well it hooks up fine but low and behold nothing happens. As it turns out the R170 PSE uses one CAN protocol while the others use a separate CAN protocol. Well so I believe anyway. The r170 I think uses CAN_C (green and green/white wires) while the other PSE’s use CAN_B (brown and brown/white wires) basically different buad rates. After looking around for can/can gateways which was daunting I realized that the can interface was controlled/decoded with a microprocessor. So I opened the two PSE’s I had the old broken, burnt slk one and the new shinny 2108001148 I picked up for $60 on ebay and found they both have the same MC68HC705X32 Microprocessor. J and found that my 98 slk230 had the same pins for the CAN bus (white cable bunch pins 8, 9) and found nothing was missing from the 210**** PSE it just had extra parts. J
Long story short I swapped the old microprocessor from the burnt PSE and soldered it into the new 210**** PSE, plugged her into my car……..and ………. Wait for it……….Awesomeness occurs.
Click my remote and doors, trunk, gas cap locks.
Click again everything unlocks.
Get in the car, cabin light stays on till the doors and trunk are shut.
Hit the lock button in the car with doors and trunk shut, doors lock.
Hit the unlock button, doors unlock.
Start the car, drive away, doors lock automatically.
Opened the trunk with key but without unlocking with the remote,,,car alarm goes off.
Yummy J saved about $200$
Didn’t need to plug up the extra pneumatics as the microprocessor probably doesn’t have or won’t get the code needed to set them off.
I believe this should work for all the following part numbers as a straight Micro swap. 2108002348, 2108002748, 2088000248, 2088001248, 2108001148, 2108001948
I bet this will work with other PSE’s as well but maybe with variation of arranging CAN and other wires.
To unsolder the Microchip I shielded the other components on the board from heat and used a heat gun while lightly lifting with long metal tweezers until the chip came off. To resolder I used a fine tip solder iron on each pin.
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#2 Old 01-14-2018
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Has anyone else tried this successfully? I picked up 2 pumps yesterday from the wrecking yard for $10 a piece. One 2108001048 and one 2108001948. I tried the whole clean thing on mine with no luck. Removed the black connector, soldered straight to board. I got some functionality back but something still isn't right. I read somewhere that there's only 5 wires that matter but that's not entirely true. If you hold the PCB up to a light, you can see that some of those pins carry voltage from one side of the board to the other. I soldered pins through the pin holes to make sure no circuits were left open. Still acting flaky. I haven't removed the white socket off of the board yet. I figured I'd try the microprocessor swap first.
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#3 Old 01-14-2018
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Originally Posted by Bahdabing View Post
Has anyone else tried this successfully? I picked up 2 pumps yesterday from the wrecking yard for $10 a piece. One 2108001048 and one 2108001948. I tried the whole clean thing on mine with no luck. Removed the black connector, soldered straight to board. I got some functionality back but something still isn't right. I read somewhere that there's only 5 wires that matter but that's not entirely true. If you hold the PCB up to a light, you can see that some of those pins carry voltage from one side of the board to the other. I soldered pins through the pin holes to make sure no circuits were left open. Still acting flaky. I haven't removed the white socket off of the board yet. I figured I'd try the microprocessor swap first.
fyi...this thread is 4 years old

https://www.slkworld.com/new-members-...d-how-fix.html
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#4 Old 01-14-2018
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Yeah, I saw that. I thought it curious that there was no responses on it. It would seem if this worked, given all the problems with the PSE in the SLK's, more people would do this and/or comment on it. This is the only thread anywhere I've seen suggesting this. I'm an electronics tech/engineer by trade so I don't have hesitation with the soldiering, mostly hesitation on frying a good microprocessor if this is bad info.
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#5 Old 01-15-2018
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FYI the PSE still works. I did mount it upside down so water wouldnt collect in it again. Unfortunatly the car went sideways into a guardrail 2 months ago. But up until then it was my daily driver. Will probably sell her as a parts car. :-( i ended up getting an ‘07 slk280 6speed two weeks ago.
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#6 Old 01-15-2018
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Originally Posted by Bahdabing View Post
Yeah, I saw that. I thought it curious that there was no responses on it. It would seem if this worked, given all the problems with the PSE in the SLK's, more people would do this and/or comment on it. This is the only thread anywhere I've seen suggesting this. I'm an electronics tech/engineer by trade so I don't have hesitation with the soldiering, mostly hesitation on frying a good microprocessor if this is bad info.
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#7 Old 01-16-2018
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Originally Posted by greenfire View Post
FYI the PSE still works. I did mount it upside down so water wouldnt collect in it again. Unfortunatly the car went sideways into a guardrail 2 months ago. But up until then it was my daily driver. Will probably sell her as a parts car. :-( i ended up getting an ‘07 slk280 6speed two weeks ago.
Hi Greenfire. I was hoping you'd see the email notification and respond. I just swapped the microprocessors on mine. Something still isn't right. *I stepped outside after writing the first 4 sentences to get the p/n off the PSE I installed.* I just found out that my alarm actually works again! I opened the trunk without thinking about it and she started chirping. It hasn't done that since I got it so that's a plus! I haven't tested everything out yet but, it does seem like my lights are working like they are supposed to. The only thing I have an issue with for sure right now is when I hit the lock button, nothing happens. When I hit the unlock button, the pump fires. I'm sure I'll get that fixed tomorrow. I'm having a hard time understanding why the microprocessor was the answer on the swap. I would have thought you would have needed to swap the EEPROM. That is something we do quite often where I work if we have a robot or robot controller die. I looked at the wiring diagrams from the site and those are way different from what I'm used to looking at. It might just look more complicated on my PC than it would be printed out. I should also point out that the microprocessors in my two units aren't the same. One was ZC507476CFU the other was SC507514CF4.

Regarding CAN_B vs CAN_C, according to Mercedes:

CAN C - Engine CAN (also known as chassis CAN)
Fast communication speeds 125 kbps or 500 kbps
CAN B - Interior CAN (also known as body CAN)
Communication speed 83 kbps


This furthers my confusion. My interpretation of this is, all of the wiring should be the same from PSE to PSE, but as you mentioned in your original post, there are some 'extra' parts. It would seem that you should be able to just plug and play the PSE's from two different cars. From what I can tell, Mercedes has been pretty consistent regarding pin outs and such. So I should just be able to install the 210 PSE without any hardware swaps assuming the pin outs on the plugs are the same.

Have you ever been able to pull up schematics on the PCB in the PSE? I'm curious to trace that through.

Thank you for posting this 4 years ago, you're saving my butt right now.

PS, what year is your SLK? Does it have the autodimming side view mirror and autodimming rear view mirror? I'm trying to restore my moms car (full story on intro page) and I need quite a few parts that I'm having difficulty finding or they are worth more than the weight of gold.

Thanks Again!
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#8 Old 01-16-2018
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OH, I forgot to mention, I came up with a slick way to remove the microprocessor. I wish I had figured it out while pulling the first one off >_< Super easy though. Take solder wick and lay across an entire side of one side of the MP. Wick as much solder as you can. Repeat on remaining 3 sides. MP will still be tacked down a little. Take a large sewing needle and run the needle between the MP package and the pins while feathering the pins. When you hear a little pop, the pin is off of the pad and push the needle in a little further. Rinse, repeat. Super trick and I didn't burn or lift anything.
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#9 Old 01-16-2018
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The microproccesor is responsible for translating the serial can commands. For whatever reason mercedes used a different can baud for our r170 PSE’s than the others. When i first started playing with this i bought the w210 PSE because the electrical connectors apeared identical. When i plugged it in, no response. After searching a ton of literature and schematics is when i learned of the r170 PSE can baud rate being different. I then originally looked to find a microprocessor that could capture one baud rate and resend in another as i was assuming the commands themselves would be the same just sent at different clock speeds. Thats when i noticed in microproccesor lit that the microproccesor itsself translates serial can commands then executes those commands. Its up to the microproccesor programer to define baud rates. Thats when the lightbulb went off. I opened both PSE’s and noticed 1) the microproccesors were identical in shape, size, pins and part numbers. 2) the PSE PCB’s had very similar wiring. So really i got lucky.
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#10 Old 01-16-2018
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The microproccesor is responsible for translating the serial can commands. For whatever reason mercedes used a different can baud for our r170 PSE’s than the others. When i first started playing with this i bought the w210 PSE because the electrical connectors apeared identical. When i plugged it in, no response. After searching a ton of literature and schematics is when i learned of the r170 PSE can baud rate being different. I then originally looked to find a microprocessor that could capture one baud rate and resend in another as i was assuming the commands themselves would be the same just sent at different clock speeds. Thats when i noticed in microproccesor lit that the microproccesor itsself translates serial can commands then executes those commands. Its up to the microproccesor programer to define baud rates. Thats when the lightbulb went off. I opened both PSE’s and noticed 1) the microproccesors were identical in shape, size, pins and part numbers. 2) the PSE PCB’s had very similar wiring. So really i got lucky.

I'm such an idiot! So I did the microprocessor swap. Put the PSE back in. EVERYTHING worked except the door lock. I could unlock no problem. I started monkey-ing around and accidently arced against something. I blew one of the glass diodes on the board. No big deal. I swapped out the diode and figured I would be good to go. Nope, now everything works except the locks, this time lock nor unlock works. So I pulled it back out. Figured something was wrong with the board. Swapped the processor to another 210 PSE I had. Plugged in, same thing. Everything works except the pump. Not sure what else I fried. I was hoping a fuse, but no dice there. Now I'm slamming my head against the wall in frustration. I looked in the boot for a fuse panel and mine definitely does not have a fuse panel in it...at least not at the right where there's supposed to be one. Back to the drawing board I suppose. I can't imagine I fried the microprocessor given that everything else works on both boards minus the pump.
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#11 Old 03-02-2018
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Alas, I had to admit defeat and end up buying a 'new to me PSE'. I did learn a lot so I wanted to share my learning. First, what Greenfire proposed DOES actually work. You can de-solder the microprocessor, solder it onto a different PSE and it will work! Before I arced mine, it was working. I de-soldered the microprocessor and soldered it onto a different board and nothing. I repaired the lifted traces on the original board, installed the microprocessor and nothing. I removed the PSE entirely started playing around and found that some of the features I thought were associated to the PSE were not. So originally when I swapped the microprocessor, everything the PSE was supposed to do was indeed being performed. It was at that point I ordered the 'new to me PSE'. The PSE I ordered looked brand spankin new and had 0 corrosion. I figured that one of two things happened when I pulled my superdork manuver and arced the repaired PSE. 1, I fried something downstream of the PSE..CCM or N40 (I think that's what I traced out), Or 2, I did fry the microprocessor. I installed the new PSE yesterday and everything is working again except for the alarm chirp. I will have to mess around and figure that out but it may be that the PSE will have to be coded or whatever. I will have to figure that one out. I'm still a noob with MB star. The interior lock switch still does the same thing too...it will still unlock the doors, but will not lock them.

Long story short, the microprocessor swap to a different PSE , w208, w210 or otherwise assuming a similar board and case; does work. There's potential for huge cost savings there. I pulled 6 PSE's from other model Mercedes cars for $10 a piece. If I sell these on ebay, I should more than make the money back on the one I finally purchased. I don't think it the microprocessors between the two boards need to match either. Mine did not and it was working until I fried it. It was a very frustrating adventure, but I hope this will help the next guy out.
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#12 Old 03-03-2018
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Quote:
Originally Posted by Bahdabing View Post
Alas, I had to admit defeat and end up buying a 'new to me PSE'. I did learn a lot so I wanted to share my learning. First, what Greenfire proposed DOES actually work. You can de-solder the microprocessor, solder it onto a different PSE and it will work! Before I arced mine, it was working. I de-soldered the microprocessor and soldered it onto a different board and nothing. I repaired the lifted traces on the original board, installed the microprocessor and nothing. I removed the PSE entirely started playing around and found that some of the features I thought were associated to the PSE were not. So originally when I swapped the microprocessor, everything the PSE was supposed to do was indeed being performed. It was at that point I ordered the 'new to me PSE'. The PSE I ordered looked brand spankin new and had 0 corrosion. I figured that one of two things happened when I pulled my superdork manuver and arced the repaired PSE. 1, I fried something downstream of the PSE..CCM or N40 (I think that's what I traced out), Or 2, I did fry the microprocessor. I installed the new PSE yesterday and everything is working again except for the alarm chirp. I will have to mess around and figure that out but it may be that the PSE will have to be coded or whatever. I will have to figure that one out. I'm still a noob with MB star. The interior lock switch still does the same thing too...it will still unlock the doors, but will not lock them.

Long story short, the microprocessor swap to a different PSE , w208, w210 or otherwise assuming a similar board and case; does work. There's potential for huge cost savings there. I pulled 6 PSE's from other model Mercedes cars for $10 a piece. If I sell these on ebay, I should more than make the money back on the one I finally purchased. I don't think it the microprocessors between the two boards need to match either. Mine did not and it was working until I fried it. It was a very frustrating adventure, but I hope this will help the next guy out.
Bad luck, @Bahdabing but I expect you've learnt a lot on the way. Good to see how far people will go to fix their R170s though.
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#13 Old 03-10-2018
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Thanks. I'm not giving up until I have her cherried out again. The electrical problems are a lot annoying though. But I will keep battling on. When I get her back to new, I'll definitely be posting pictures. She's a little rough right now.
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