WABCO ABS noise
 

After I turn my Rover off this little guy is still humming along for hours

Is that normal?

I don't think so. I've never heard mine do that.

mine just makes a weird buzz/grind noise down by the pedal when you start it for the first time. (assume thats ABS test noise or something?)

nothing after the truck is off though

It is normal.
https://landroverforums.com/forum/di...tor-box-18224/

Depending on what the noise is, it may be normal, and it may not be. My vehicle can be parked for hours, and if I pop the hood, I can hear a very faint noise like nose coming from my ABS modulator which I would describe as an electronic representation of a stopwatch.

Mine has made this noise for years, and others have posted about it as being normal. Mine once sat for a week in an airport parking lot (I assume making the noise the entire time), and had no hesitations starting after I had returned.

I unplugged mine, as I was curious, and checked voltage on the various pins in the plug. I didn't note which pins were what, but essentially found:

• A couple of "dead" pins, presumably grounds or the like.
• One pin with a steady 5V
• The rest of the pins had voltages which cycled in time with the "buzzing" of the box once the plug is in, the cycle being 3.1 volts to 3.4 volts, or thereabouts. I'd say the cycle was roughly...four shifts per second?

After plugging and unplugging the connector a couple of times, the noise stopped, and the pins all read zero volts.

I'm now curious if it is at all related to my intermittent amigos. My symptoms are:

• The car has only once thrown the lights while actually driving
• The car never throws the lights when cold, including the entirety of whatever drive you go on (even 100 miles) from that cold start
• In seemingly random situations, stopping and restarting, or putting the car into park and then drive, once the engine is hot will trigger the appearance of the amigos. They will then be on until the engine has fully cooled down.

My theory now is they are on until the box stops buzzing. But it's probably a bogus theory!

Noise is normal but isn't always there

Seeing this is from 7 years ago I don't even remember what issue I was having. With the ground bypass everything works great. Every now and then the brakes will get a good squeak with a rough road code (1590 or w/e it is) .

Mine does this as well. Car is off, no key in switch, and the ABS module makes a repetitive buzz that can only be heard if you put your ear close to it. Common sense says this is drawing power from the battery, but who knows how much?