ABS pump stuck on...!! need help on fiber optic audio too!
 

2002-ML320. I got a couple problems.. After driving for maybe a half hour, the abs modulator/pump starts to run continuosly, even after turning vehicle off and key out, still runs untill i pull out relay k25 for the abs.

The other concern is The audio system, got the old classic no sound and cdc not reading, how can i tell if the problem lies in the fiber optics or in the cdc, or even the amp? A lil lost here and any help would be greatly appreciated

pull the fuse or relay and just drive it.

Ive had the relay out for months, but would like to have abs again. Thanks though.

My quess would be one of the wheel speed sensors is giving no signal (wheel not tunning) to ABS control unit which activates the pump relay. Any other dash lights ON?

On audio, someone with oscyloscope will have to help you out. If the radio is functional but you can't play cd's, amp and radio head unit is fine.

My first thougt was the wheel speed sensor too, but then i borrowed an older scan tool and was able to get reading from all four wheels without a problem.,

I'll see if i can get my hands on an o-scope and check it out. Thanks.

Almost forgot.. The three lights on the far left are the ons on..

Check your brake padal switch, could be stuck in compressed (ON) position and not returning when you let go your brake pedal. But I don't think there is power comming to it without the ignition ON.