I have been overwhelmed at work, sorry I did not see your later posts until now. I think you are wasting a lot of time and money.
The following is too late for you, but others will read this and learn and avoid your jagged path.

• RCMs do all the stuff you keep typing about. MOST of us DO NOT have the skills to fix an RCM without a spare RCM to verify operation, which DJ does. I am convinced you have spent tons of time an money for no good reason. I spent 30 years in benchtop, component-level electronic repair, fixing an RCM would be easy for me - if I had a spare RCM and spare car to verify operation - I don't but DJ does. GET A NEW RCM NOW.

• One day, my RCM failed. Being a fourteen year member here, I knew what it was right away. The car was in the garage and all I wanted to do was move it, so no big deal. I ordered a new RCM from PartsGeek for $129 (I buy the SLK230 version as it's the same part with one fuse wrong, but it's cheaper -move the one fuse from the old unit and you are good). I shipped my old RCM to DJ for rebuild. THIS WAY, i have a spare. The new one came in three days, got car running. The fixed one was back in about ten days, I now have a spare - and I don't need no damn tow truck.

EVERY post you made in this thread past your first one, described a bad RCM. EVERY ONE. Sorry I was not around to see that. (The tire light was not part of this, but that's a nightmare for another thread.) Also, that air pump you changed was a waste of money, IMO. The air pump DOES NOT and WILL NOT make the car run worse or better. it's just there to treat the exhaust to reduce nitrous oxide emissions. MOST of the time, that pump is failing cause the RCM is not turning it on!

• The RCM causes all sorts of failures, you can loose your ABS/ESC, speedometer, air pump operation, fuel pump, engine cranking, all sorts of failures -the RCM is the car's "Power distribution and switching module", most critical systems are powered by it , so most critical systems can fail due to the RCM.

Most who post here KNOW this, they just don't SAY it - but the RCM is your FIRST STOP when almost anything fails -you put your spare in, and if things are not better, you go on from there. If you do not have a spare, you damn well better get one or you will be meeting tow truck drivers more than you want to. RCM's plug in, you don't even need tools (You already know that but I"m now typing for others who read this). The cost of ONE tow would buy an RCM in most cases. You need no "shop" or "mechanic", you don't even need US, you need a spare RCM.