The Ign SW replacement is an easy fix and a multi issue generator when they go semi-dead. I replaced one after getting radio and instrumentation issues that were random just by turning or wiggling the key cylinder in the column. 1 hr later all problem would be gone. Sometimes I think these SW go bad over time regardless of key cycle starts due to the vehicle just being energized when parked. There is 12 volts going through the switch 100% of the time even in "sleep mode", if I understand our Bus systems correctly. I am thinking of switching to battery disconnects on vehicles parked longer than one week of non use or storage. Yes, I realize I will loose the radio and HVAC settings unless I use a remote 9volt battery sourced connection through one of the aux ports (cig lighter for example).

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2005 X5 4.8IS
The Blue ones are always FASTER....

Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green