Technical data
📄 Head unit, audio/navigation (635)
📄 Antenna, mobile phone/GPS/OnStar
📄 Antenna, GPS (cars with OnStar)
📄 Amplifier, Premium
📄 Amplifier, Prestige
📄 Test readings, amplifier connections
📄 Speakers, Premium
📄 Steering wheel control (switches)
📄 Steering wheel control (switches), Sentronic
📄 CD changer