It's been a while and I am still trying to help a friend fix his S300. I can start and run the machine by jumping the relays, but desperately need a schematic to trace the wires to the computer. Is there anyone who has a wiring diagram handy?
What is the problem? I take it doesn't start, what does the dash do? Any codes?
No voltage at the computer, everything is dead. I can start machine by jumping relays.
stupid question maybe...but have you checked the main fuse above the battery?
That or what about the 25 amp computer fuse?
switch power fuse and/or relay may cause the same problem, what relay(s) are you jumping to start the machine? :drinkup