2011 Cadillac DTS Owner's Manual - Page 167

{ WARNING: When the Adaptive Cruise Control radar is blocked by snow, ice, or dirt, it may not detect a vehicle ahead. FCA may not help you avoid a collision under these conditions. Do not use FCA when the radar is blocked by snow, ice, or dirt. Keep your radar clean. See "Cleaning the System" under Adaptive Cruise Control on page 4 ‑ 14 . Unnecessary Alerts FCA may occasionally provide alerts that you consider unnecessary. It could respond to a turning vehicle ahead of you, guard rails, signs, and other stationary objects. This is normal operation, your vehicle does not need service. Other Messages There are three messages that may appear on the Driver Information Center (DIC). They are CLEAN RADAR, RADAR CRUISE NOT READY and SERVICE RADAR CRUISE. See DIC Warnings and Messages on page 4 ‑ 62 . { WARNING: FCA may not detect and warn soon enough to stationary or slow-moving vehicles or other objects ahead of you. You could crash into an object ahead of you. Do not rely on FCA when approaching stationary or slow-moving vehicles or other objects. Cleaning the System The radar can become blocked by snow, ice, or dirt. If so, you may need to turn off the engine and clean the lens. See "Cleaning the System" under Adaptive Cruise Control on page 4‑14. 4-9