Cadillac CTS/SRX Radio Replacement GM20SR Installation Instructions

The GM20SR is a plug and play interface that allows replacement of a General Motors Class II factory stereo in Cadillac CTS and SRX vehicles. It will maintain operation of the OnStarо and factory amplified systems. The GM20SR has on board switching to allow audio from the OnStarо system to play through the two front factory speakers when OnStarо is active. It also retains warning chimes for Onstarо operation. For additional vehicle integration, use Scosche’s line of SWC-1 steering wheel controls (SWC) interfaces to retain SWC’s with the aftermarket radio. Also retains Vehicle Parking Assist chimes.
• Class II circuitry will not disable vehicle data bus even if interface loses power.
• OnStarо active LED and Ignition on LED
• Provides +12v switched accessory output. No more searching for switched +12v in fuse box or kick panel.
• Mute output to either mute the aftermarket radio or to turn it off when OnStarо is active.
• OnStarо Volume control via factory steering wheel audio controls or click wheel .
• New radio will operate with the vehicle RAP (Retained Accessory Power) system, stays on after the key is turned off and for 10 minutes or until a door is opened.
NOTE:
1. The GM20SR does not retain the factory XM receiver, you will lose this option when the factory radio is replaced with an aftermarket radio.
2. You may use this interface even if the vehicle does not have OnStarо but need to the interface to operate the factory amplifier.
3. OnStarо must be enabled using the OnStarо button on the rear view mirror, steering wheel OnStarо button will not enable OnStarо.
4. OnStarо volume is not adjustable on CTS-V and SRX models, volume is preset at medium level.
5. Not compatible with SRX Factory Navigation Radios

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