PAC RP3-GM11 Radio Replacement Interface for Select GM(R) Vehicles (Class II Databus) PET2 PACRP3GM11 0 High-current 10A accessory output;Data-controlled outputs for connection to navigation radiospeed reverse & E-brake status output wires;Retains factory-installed amp (if equipped);Data controlled R.A.P. accessory output;Keeps vehicle databus intact for service;Plug-in connection for steering wheel control module (SWI-RC or SWI-X);Interface can be quickly updated if needed from PAC(R) website using PAC-UP USB adapter;Adjustable chime volume: 4 levels & off;Includes RadioPro(R)3 module plug & play vehicle connection harness & instruction manual;For GM(R) vehicles with Class II databus & 24-pin harness;;