2011 Acura MDX Owner's Manual - Page 342

Security System, Compass The security system will not set if the hood, tailgate, or any door is not fully closed. If the system will not set, check that the doors, the tailgate and the hood are fully closed. Do not attempt to alter this system or add other devices to it. Compass Operation On models without Navigation System SECURITY SYSTEM INDICATOR Compass operation can be affected by driving near power lines or stations, across bridges, through tunnels, over railroad crossings, past large vehicles, or driving near large objects that can cause a magnetic disturbance. It can also be affected by accessories such as antennas and roof racks that are mounted by magnets. Compass Calibration If you see ''－－'' in the compass display and ''CAL'' and '' '' are shown in the calendar display, the compass is self-calibrating. The compass may need to be manually calibrated after exposure to a strong magnetic field. If the compass seems to be continually showing the wrong direction and is not self-calibrating, do the following. Once the security system is set, opening any door, the tailgate, or the hood without using the key or the remote transmitter, will cause the alarm to activate. It will also activate if the audio unit is removed from the dashboard or the wiring is cut. 338 2011 MDX