OS-2CTS Cadillac CTS/SRX Radio Replacement Installation Instructions

Step 1. Pre wire the RAD-18 wire harness to the aftermarket stereo wire harness. If the aftermarket stereo has a mute wire, cut the brown wire as close as possible to pin #16 of the RAD-18 harness and connect this mute output wire to the stereo’s mute wire. The amp remote wire (blue/white) must be connected to the stereo’s remote wire.
Step 2. Connect the black 16 pin and the red 20 pin harness to the factory radio harnesses. Connect the OS-CTS wire harness into the OS-2CTS interface.

Testing and Verifying Operation
1. Turn ignition on. The green ignition on LED inside of the interface will turn on and the +12v accessory wire will turn on.
2. Turn on the radio and check the balance. Note: Audio will not fade as the rear outputs of aftermarket radio can not be used.
3. Pressing the On Starо button on the mirror will mute or turn off the radio and allow the audio to be heard from the speakers. The On Starо active red LED will also turn on. When On Starо disconnects, the radio will un-mute or turn back on and the On Starо LED will turn off. On Starо audio level can be adjusted using the volume controls on the steering wheel (Volume level is preset for CTS-V and SRX vehicles).
4. Turn off vehicle and remove key. RAP will be active and keep the radio on for 10 minutes or until a door is opened.
5. The green ignition on LED and radio will turn off when RAP turns off or door is opened.
DISCLAIMER: Under no circumstances shall the manufacturer or the distributors of the OS-2CTS parts be held liable for consequential damages sustained in connection with the OS-2CTS. The manufacture and it’s distributors will not, nor will they authorize any representative or any other individual to assume obligation or liability in relation to the OS-2CTS other than its replacement.

source