Stop lamp actuation, function - GF82.10-P-3010CW
MODEL 204.0 /2 up to Model Year 8
General brake light actuation function sequence
The brake light actuation is comprised of several subfunctions.
These are:
- Static brake light actuation
- Flashing brake light actuation (adaptive brake lights)
Static brake light actuation
Function requirements:
- Circuit 15 On
Static brake light actuation function sequence
Actuation of the service brake is detected by the brake light switch (S9/1). It is read in directly by the Electronic Stability Program control unit (N30/4).
The Electronic Stability Program control unit transmits the request "Brake light On" to the front SAM control unit with fuse and relay module (N10/1) via chassis CAN.
The front SAM control unit transmits the request via interior CAN to the rear SAM control unit with fuse and relay module (N10/2) and the trailer recognition control unit (N28/1) (with code (550) Trailer hitch).
At the same time, the request "Brake light On" (circuit 54) is forwarded directly by the Electronic Stability Program control unit to the front SAM control unit and to the trailer recognition control unit. The signal is looped through in the front SAM control unit and forwarded to the rear SAM control unit.
The rear SAM control unit actuates the following components:
- Left brake light and taillight and parking light (E3e9) and right brake light and taillight and parking light (E4e9)
- Inner left brake light and taillight (E3e10) and inner right brake light and taillight (E4e10)
- Center brake lamp (E21)
The trailer recognition control unit actuates the following components via the trailer socket (X58) (with code (550) Trailer hitch):
- Left and right brake light on trailer
Flashing brake light actuation (adaptive brake lights)
Function requirements
- Circuit 15 On
- Brake operated
- Hazard warning flashing not active
- Vehicle speed v > 50 km/h and
- Brake Assist active or
- Vehicle deceleration a > 7.5 m/s2
Function sequence for flashing brake light actuation (adaptive brake lights)
The vehicle deceleration and the speed are read in by the Electronic Stability Program control unit.
In the event of an emergency stop, the Electronic Stability Program control unit sends a corresponding signal to the chassis CAN.
The front SAM control unit forwards this over the interior CAN to the rear SAM control unit. The rear SAM control unit actuates the brake lights and the center brake lamp with a frequency of f = 3 Hz for the duration of the signal (min. t = 1 s).
The emergency stop signal is reset if one of the following preconditions is fulfilled:
- Brake released
- Circuit 15 Off
- Vehicle speed v < 10 km/h
- Brake Assist not active and vehicle deceleration a < 6.5 m/s2
| Electrical function diagram for brake light actuation | PE82.10-P-2057-99FAA | ||
| Yaw rate, lateral and longitudinal acceleration sensor, component description | B24/15 | GF42.45-P-4810CW | |
| Rear lamp unit, component description | E3, E4 | GF82.10-P-2018CW | |
| Component description for the RPM sensor | L6/1, L6/2, L6/3, L6/4 | GF42.30-P-4552CW | |
| Supplemental restraint system control unit, component description | N2/10 | GF91.60-P-4068CW | |
| Front SAM control unit with fuse and relay module, component description | N10/1 | GF54.21-P-6070CW | |
| Rear SAM control unit with fuse and relay module, component description | N10/2 | GF54.21-P-6030CW | |
| Trailer recognition control unit component description | N28/1 With code (550) Trailer hitch |
GF31.19-P-4050CW | |
| Electronic Stability Program control unit component description | N30/4 | GF42.45-P-5119CW | |
| Electronic ignition switch control unit, component description | N73 | GF80.57-P-6001CW | |
| Brake light switch, component description | S9/1 | GF42.10-P-4003CW |