Hi all.
2000 Discovery sitting in the garage, no key, doors unlocked.
After opening any door, a faint pulsing noise is emitted by the ABS assembly and from one of the relays in the engine bay, can be heard in quiet environments and lasts for several minutes.
Is that normal ?

 

Yes that is normal for it to buzz after shutting off the engine, it should last no more than 10min.
There was a TSB on it running non stop and draining the battery after a few days, a computer re-program fixed it.