Q45 (1994) ink how they may be cElectrical mal-functions

[colincharles]

My 1994 Q45 is experiencing an odd assortment of electrical problems. Can anyone think how they may be connected ?First the courtesy lights in the driver's and passenger's door refused to turn off, so I pulled the bulbs out to avoid draining my battery.Then I noticed the same issue with the overhead light on the roof, which I then left in the "off" position.Next I found that the instrument lighting had failed. Also, the headlights are stuck on hi-beam when turned on - the switch to move from Hi to Low is not working. If anyone can think of a connection, it would be greatly appreciated.

[maxnix]

Got FSM? Try looking at the wiring foldout and doing some tracing.

A wild guess is the BCU at least, but metering would have to confirm it.

May be more than one failed component.

[colincharles]

Thanks Brian - I will check that. I don't have a full colour FSM, but I do have a CD service manual (monochrome only).