I'm new to the fora, but wondered if any of you experts could shed some light on a really wierd electrical problem with my 1997 740i.
The problem started as the airbag warning light in the instrument cluster intermittently starting to glow, and the screen in the centre console not displaying properly, almost like a TV with a bad aerial connection.
This got progressively worse, and started to effect other systems, such as the breaklights flashing when the break pedal was not depressed, and the interior lights turning themselves on while driving. Also the radio would not work, the cruise control and the steering wheel buttons would not work.
My local garage told me that this was the ‘clock spring’ that sits inside the steering wheel that connects the moving part of the steering wheel to the non-moving car electrics.
Accordingly I got a new one fitted, which altered the behaviour of the problem but not fixed it.
What happens now is that sometimes I will get into the car, turn on the ignition and everything is OK, and it stays that way while the ignition is switched on.
On other occasions the airbag warning light does not light during the instrument lights check, the radio and other systems (including the power steering) will not work. Sometimes this will rectify itself after a period of time.
What is really bizarre is the recent discovery that if the problem manifests it can be sorted by pulling down either of the sun visors, and opening the slider over the mirror so that the lights should come on seems to make part of the electrical system ‘reset’, there is a bleep (normally heard when first turning the ignition key), the airbag light comes on for a few seconds, then everything works as it should.
I am totally puzzled as to what this might be, and would love any ideas on where I should start looking for this problem.