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MJM posted a topic in E39 1996-2004I'm in the process of retrofitting a rear electric sun shade to my facelift 530i sport, and having sourced the parcel shelf with blind (the easy bit) I now need to fit the wiring and control. My car currently has DSC and PDC switches on the console switch centre. This is the very thin (basic) switch centre. Being unable to quickly find a replacement switch centre with exactly my new options (DSC, PDC and sun shade,) my next instinct was to crack it open to investigate inside and this is what I found... It only contains the switches themselves, backlight illumination LEDs and the LED indicator for the PDC switch. The resistors are to set the LED current. There's no active circuitry at all, and there's lots of option links on the PCB to allow each switch and LED function to be routed to various different main connector pins. This allows BMW to put any function in any switch location (well almost) by simply fitting the surface-mount components, including zero-ohm resistors (which act as wire links,) according to the vehicle's option list. This led me to believe that so long as I got a three-button switch centre with the sun shade option (containing the sun shade drive electronics) I should be able to re-configure the other buttons for PDC and DSC by a little bit of soldering. A quick look at BMW WDS confirms that these functions are passive switch circuits, both on the basic switch centre and on the more exotic (deeper) switch centre typically found with heated seat and sun shade options. So, now to find a switch centre with at least 3 standard buttons including the sun shade...