Two problems related to tail light switch have been reported for the 2003 BMW X5. The most recently reported issues are listed below.
The left rear tail light continues to work intermittently. The 'check brake, check rear light' warning illuminates even after bulbs have been replaced. I have replaced the bulbs numerous times, with the most recent being a few days ago. Yet, the warning message reappeared this evening. The problem is similar to those recently investigated by NHTSA on other BMW models such as the 3 series and is a common complaint in BMW forums and other forums on the internet.
The right rear brake light bulb shorts out. Instrument warning for rear brake / tail lights activates. Problem occurs multiple times due to an apparent flaw in the brake light assembly circuit and plastic that forms the split circuit for positive (+) negative (-) connection points to bulb socket leads. To repair - the metal assembly needs to be bent outward (direction away from tail light lens) to increase tension between bulb socket electrical connections and metal plate of tail light assembly. Problem seems to be caused by weakened plastic that causes the metal plate in tail light assemble to loosen creating inadequate back spring tension between the plate and socket connectors. Recall on BMW 3 series for: no. 11v-438: lamps in rear quarter panel 2002-2005 3 series is described as the exact problem.
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