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E46 Driver information
LIGHT SWITCH CENTER (LSZ)
The Light Switch Center is a compact component that combines the electronic control,
switching, and monitoring for all exterior lighting on the E46. In addition the LSZ controls
the illumination and intensity of the instrument cluster lighting and LCD blocks. The LSZ
assembly is mounted in the dash and consists of two serviceable components; the
switch assembly and the control module.
The LSZ provides the functions of the LCM including:
• Hot and cold monitoring of the exterior lights.
• Emergency lighting function
• Short circuit protection
• Redundant storage of mileage and SI data
The total scope of the LSZ system includes the following:
• LSZ control module
• LSZ switch assembly
• High-low beam/turn signal switch
• Brake light switch
• Hazard warning light switch
• Fog light relay
• Exterior lights
• Dash/LCD lighting
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