Brake light switch: Function

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The brake-light switch is a Hall sensor fitted at the brake pedal. The switch is supplied with voltage by the light module as of terminal R ON.

The brake light switch supplies two signals:

S_BLS Brake light switch
S_BLTS Brake light test switch

These signals are received and evaluated by the individual control modules (choice, see table below) independently of one another:

Signal	Brake light switch	Brake-light test switch
Receiving control module	Motor control	Motor control
	DSC	CAS
	EGS
	SMG
	LM
	JBBE

The redundant signal "Brake activated" as a directly wired signal and as a CAN message means that transmission is also ensured in the event of faults on a signal path.

In the engine management system, both signals of the brake-light switch are evaluated simultaneously. This direct comparison of the two signals makes it possible to establish definitely whether the brake pedal is being operated. Furthermore, a malfunction of the brake light switch can also be diagnosed.

The two signals of the brake-light switch behave in relation to one another according to the following table:

	Brake pedal operated	Brake pedal not operated
Status, brake-light switch	Open	Closed
Status of brake-light test switch	Closed	Open

The following signal levels can be measured at the two outputs of the brake light switch:

	Brake pedal operated	Brake pedal not operated
Signal, brake light switch	Battery voltage	0 V
Signal of brake-light test switch	Battery voltage	0 V