3) This CD changer is proune to fail,how ever in order to know if it works you must select the CD feature at the tape's deck,then all lites should turn on,after that press the the eject button at the CD changer console to make sure that there's no other CD's inside,after that press the number (1) button,that specific button will blink about 3 or 4 times,when that same lite turn amber it means you can go ahead & carefully place the cd,,don't force it in,the CD changer would actually "grabb" the Cd & slide it in to play.
Another detail i fail to aknowledge you is that if you what to play a Cd in the slot # 4 you just press that specific button,the CD will process your command & play the CD,also if you wnat to remove that CD you press the button the CD is placed on & then press the reject the button onces you had the CD out you can go ahead & put another CD in that same slot.whenever a slot is empty i think the lite will remain amber color to notify you that the slot's empty
Along with the owners manual at the globe box there should be a 4 pages manual to show you how the CD changer works,if is not there then let me know,i'll look into mines this weekend & write you back,but first take care of that air leak,the ABS sensor & the door.
If the CD changer don't work few of the fellow VX'ers have their own removed & stored with no use so you can make a deal for one.
4) the dome light can be easy as a blown bulb to a broken wire in the line,to know if the wires are bad you should take the VX to an audio shop & have them test the wiring for shorts with a multimeter tester,also check the fuse box at the very left side of the dash board,if you haven't noticed there's a fuse box cover,there's the fuse related to the doom light,another possible cause of the non dome light is the switch it self that may be have loose contact properties.