Crutchfields supplies 2 relays as part of the DSLV package that you MUST include with the module. It takes care of any relay wiring you might have to do. As I recall, this turns this into a 3 or 4 wire job. With those slick Scotch connectors, it's a snap!

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Bill Streep
San Antonio
'57 190SL (toy)
'08 S5500 (mine)
'09 CLK550 (wife's)
'06 SLK350 (daughter's)
'11 GLK350 (daughter's)
'03 CLK310 (spare)