Product details:

The GM13SR was designed to make installation of any brand name aftermarket head-unit simple. The GM13SR allows the customer to replace the factory head unit with an aftermarket head unit and utilize their factory amplifier without having to re-wire the entire system. The GM13SR provides data-driven park brake, reverse light, AMP trigger of factory-amplified systems, vehicle speed sense (VSS) and auto illumination trigger outputs. The GM13SR offers balance control and fading for complete manual sound management. The unit has 4-channel RCA leads so the installer can use the RCA output of the stereo and gain the highest quality sound rather than go through the speaker level output. The 3-wire hard-wired RCAs are color coordinated for left right-front and rear speaker colors and easy installation.