We have a 2003 E320
Mercedes Benz sedan, rear wheel drive (not AWD) 152k miles and the instrument information display shows in ALL RED with "WARNING" "REDUCED BREAKING EFFECT" START ENGINE & "WARNING" LONGER STOPPING DISTANCES" START ENGINE.
(same status whether driving or parked)
What I do know: This car has the SBC braking system.
-Just installed new 12 volt Back up Battery
(old one was completely
dead) related to the SBC system. (this did not change anything on
-Just installed new main 12v battery located in trunk.
(no change in display).
-Just installed all new rotors
, brake pads (pad sensors were all good
and verified with DVM meter and show good. (no change in display).
My conclusion is a bad SBC unit(MB paced a 10 yr warranty on the SBC unit after numerous failures were reported, this car is out of that warranty period) The unit seems to be OK, cycles on/off when brakes are pumped, etc.
Note: I will not be satisfied with answer if same as above.
Also, electronic door lock/unlock feature, when pressed, door lock relay chatters repeatedly(possible bad diode on related relay?) If you agree on possible faulty relay, please identify where it is located.