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International Automotive Technicians Network
Re: BMW won't upshift when lights are on!
Posted to Technical Discussion Forum on 6/22/2005

If this car is a rust bucket, you may find that a large wiring harness from the LF firewall that goes down along the LF rocker is water soaked, stretched and maybe cut from rusting, jagged body metal.

Lift the carpet and sound deadner in the footwell to insp... Login to read more.