One-Time Valet Feature; Sensors; Shock Sensor - Directed Electronics Concept 550 Owner's Manual

Turn ignition on and press the arm/disarm button.
Arm the alarm and then disarm the alarm.
Turn the ignition on and enter the system valet/PIN code.

one-time valet feature

This feature allows the system to be put in valet mode only until the
next time the ignition is turned on.
OFF: Valet mode will only be exited by using the valet switch or
the remote control.
ON: Valet mode will be exited every time the ignition is turned on.

sensors

shock sensor

The 504C dual zone magnetic resonance shock sensor provides a warn
ing trigger for lighter impacts to the vehicle as well as a full trigger for
heavy impacts.
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