Stop Lamp Actuation, Function

Stop Lamp Actuation, Function






Operational sequence
1 Basic prerequisite:
- The key in the electronic ignition/starter switch is in position "2" (c. 15) and the service brake is applied.
2 Voltage is transmitted to the VCS control module (A7/3n1) and to the EIS control module (N73) over the switch contacts of the stop lamp switch (S9/1).
3 The EIS control module (N73) transforms the voltage signal and signals "Stop lamp ON", to the rear SAM control module (N10/8) via the passenger compartment CAN bus. Simultaneously the ESP, PML and BAS control module (N47-5) transmits the voltage signal of the stop lamp switch directly to the rear SAM control module.

NOTE: Direct actuation of the rear SAM control module by the ESP control module is intended to counteract any possible delay in transmission of the stop lamp signal from the EIS control module via the passenger compartment CAN bus.

4 The rear SAM control module actuates the stop lamp in the left and right taillamps (E3 and E4) and the center high-mounted stop lamp (E21).

NOTE:
- In addition to its actual purpose of actuating the stop lamps the stop lamp switch is also important for other vehicle functions. The stop lamp switch is received, analyzed and used for actuation of system-specific functions by the EIS control module and ESP control module
- from the (ME-SFI) control module (N3/10),
- from the electronic selector lever control module (N15/5),
- the automatic transmission (N15/6),
- the DTR control module (N63/1),
- the keyless go control module (N69/5), and
- the electronic transmission control (ETS) via the passenger compartment CAN bus and the engine compartment CAN bus.