Hey guys--

2004 Disco II SE. Noticed a buzzing noise even after the truck had been turned off, coming from behind, or to the left of the dash. It runs and runs and runs instead of clicking off, and drains my battery. The issue (idk if related or not) has also come with my rear view mirror compass giving me wrong directions or coming up with a "C". Does anyone know what this issue is? I've read some stuff about a dirty interior filter fan, but figured I'd check here and get some protips. Thanks!!

 

I've read that some D2 owners have had the ABS module start to fail and buzz after engine shut down. You can check there.

As for the compass here it is from the RAVE manual...
Because of changes in the lines of magnetic influence, the compass is set for operation in one of fifteen different zones
depending on the current location of the vehicle. If the vehicle is to be driven in a different zone, the compass will have
to be reset for operation in that zone. To determine the correct zone for a particular location on the planet, refer
to the maps provided in the Owner's Handbook. The mirror's default setting is zone 8 which is suitable for central
European countries (Germany, Austria, Italy etc.).

The compass should be set to the correct zone using the following procedure:
1 Switch the ignition to position 'II'.
a If the compass displays one of the eight compass point directions, proceed to step '3'.
b If the compass displays 'C' then proceed to step '2'.
c If the display does not show either of the above, then the calibration button on the underside of the mirror
should be pressed and held for approximately 6 seconds, using a small probe (e.g. paper clip or ballpoint
pen). The compass should now enter the set mode and 'C' should be shown in the display.

2 To calibrate the compass, the vehicle must be driven slowly (5 mph (8 km/h) or less) in a circle until the display
shows a direction (usually 1 or 2 revolutions). The mirror can calibrate itself during normal driving, but this will
take considerably longer.

3 Set the compass to the relevant zone of magnetic influence by pressing the calibration button on the underside
of the mirror for approximately 3 seconds, using a small probe, until a number is shown in the display. If the zone
is being entered for the first time, the default zone setting '8' should be displayed. If the zone is being reset from
a previous entry, the previous zone setting number will be displayed.

The calibration button should now be pressed and released with single presses, using a small probe, until the
desired zone number appears in the display.

After approximately 10 seconds, the compass display should return correctly set to the required zone.

Note the degree of magnetic variation from one zone to another is only very slight. Recalibration of the compass is
not normally necessary unless several zone changes are undertaken.

 

My ABS module makes an intermittent buzzing noise when the truck is off. No noticeable effect on battery - searched through and sounds like it's relatively common. I can't hear it from inside the cabin though - only if I open the hood.

 

My ABS module does the same, although I can’t hear it from inside. I’ve never had a problem with it draining my battery either and it’s not uncommon to go a week between drives in my Disco.

How long does it take for your battery to drain? That will be some indication of what kind of electrical draw we’re talking about here.

 

Also, in regard to the fan, it’s located just underneath and to the left of the steering wheel behind a slotted grille, they like to tick when dirty. I tried cleaning mine with some compressed air but it still makes a quiet sound. It shouldn’t be running when the truck is off.