Static Apply
WARNING: This page is about a different car, the 2011 Jaguar XKR, 2011 Jaguar XK, 2010 Jaguar XKR, and 2010 Jaguar XK. However, it is still accessible from the selected car via links, so may be relevant.
The parking brake control module receives a vehicle speed signal from the anti-lock brake system (ABS) module on the high speed controller area network (CAN) bus. If the parking brake switch is pulled to the 'Apply' position and vehicle speed is less than 2 mph (3 km/h), the control module will instigate its 'Static Apply' mode and drive the actuator to apply full parking brake force to the rear wheels.
The parking brake control module monitors the current drawn by the actuator and compares this to information held within its configuration software to determine when full braking force has been applied.