Here's what I did for the company leased vehicle I had:http://www.teamrocs.com/technical/pa...lay_basics.htm
pins 85 & 86 are the coil; 85 to the CD player's remote wire/86 to ground
pins 30 & 87; 30 to fused 12VDC/87 to the amp(s)' remote connection
Find the interior fuse panel; and, read the owners manual to find a fuse you can tap into (something not essential to vehicle function; such as, cigar lighter, etc...) Use a multimeter (not a test light) and find out if that connection turns on/off with the key.
Or, if it turns off, you don't have to use the relay; wire it direct to that add-a-fuse
Relay - turns amps off with CD player
Fuse that turns off - extra protection if relay sticks or wiring direct