V70 2.4 L5-2.4L VIN 61 B5244S (2001)
Brake Switch (Cruise Control): Description and Operation
Stop Lamp Switch
The task of the stop lamp switch is to provide the engine control module (ECM) with information about the position of the brake pedal.
The information is used to switch off the cruise control. In the event of a fault with the electronically controlled throttle system, the engine speed (RPM)
can not be affected by the accelerator pedal (AP) when the brake pedal is depressed.
The stop lamp switch signal is also used to diagnose the brake pedal position sensor. From model year 2002 the brake pedal position sensor is directly
connected to the brake control module (BCM). The brake pedal position sensor was previously directly connected to the engine control module (ECM).
The stop lamp switch is supplied with power from the ignition switch (terminal 30). When the brake pedal is depressed the switch closes and a high
signal (12 V) is transmitted to the engine control module (ECM).
The engine control module (ECM) can diagnose the stop lamp switch. The status of the switch can be read using VADIS.
The stop lamp switch is on the pedal box by the brake pedal.