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.