STOPLAMP Switch

WARNING: This page is about a different car, the 2006 Land Rover Range Rover. However, it is still accessible from the selected car via links, so may be relevant.

The stoplamp switch is mounted in the brake pedal bracket and operated by the brake pedal. The stoplamp switch is a Hall effect switch with dual status outputs. Both of the outputs are supplied to the anti-lock brake system (ABS) module. One of the outputs is also supplied to the lighting control module (LCM) (to operate the stoplamps) and to the engine control module (ECM).

Power for the stoplamp switch is provided by a feed from the auxiliary contacts of the ignition switch via the central junction box (CJB). The power circuit is completed by a ground connection from the stoplamp switch to a ground header on the body.

When the brake pedal is not pressed, the outputs from the stoplamp switch are low, between 0 and 2 V. When the brake pedal is pressed the outputs are pulled high to between 8 V and battery voltage.