Quote:
Originally Posted by JensenHealey
Just a progress report here on my ABS light on constantly problem.
I took the car to a local Mercedes specialist (not a dealer) and they put the car on their Mercedes W124 ABS diagnostic tool.
This tool plugs into the factory harness in place of the ABS ECU behind the battery.
I believe this is a factory diagnostic tool.
They confirmed that the wheel / diff sensors are all within spec.
They did think there was an intermittent issue with the silver 6 pin relay inside the pump unit.
They said they "cleared any codes"
They tried a known good silver relay and that did NOT solve the problem.
Finally late in the afternoon they called me to say "they give up" and they are NOT able to isolate or repair the issue.
So tomorrow morning I am going to pick the car up pay a small bill of $80 plus tax for their diagnostic time and take the car back with the damn ABS light still on.
I will quiz them for any additional details or suggestions when I pick the car up.
ARGH!!!!
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yeah, that's too bad. i would think they would pursue it further as there's not much else to go wrong. if it is the alt, it could be overcharging or be bleeding too much ac voltage through a bad diode, very easy to check. i never put an abs ecu in ANY bosch abs car, but it's been 20 yrs since i've worked on that generation mb. only thing i've done is replace the front sensors or the ovp relay. COULD be their KNOWN good relay wasn't.