STOPLAMP Switch
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 stoplamp switch is mounted on the brake pedal box and is connected to the vehicle harness via a four pin multiplug.
When the brake pedal is pressed, the switch contacts close. This allows a hard wired signal feed to be sent to the engine control module (ECM). A stoplamp switch status message is then sent from the engine control module (ECM) to the anti-lock brake system (ABS) module on the high speed controller area network (CAN) bus. The anti-lock brake system (ABS) module is then able to control braking force accordingly in conjunction with the hydraulic control unit (HCU).
NOTE:
The stoplamp switch also forms part of the speed control system.