Safety switch-off (WS), function - GF82.30-P-3005SN
MODELS 215, 220 as of 1.6.00
Networking of safety cutout Intermittent wipe
Safety cutout with the intermittent wiping function
The following safety precaution has been incorporated in order to minimize the risks of possible injuries:
- The intermittent wiping function (combination switch in position 1) is suppressed at a vehicle speed of less than 5 km/h as soon as one of the front doors is opened.
- The function is possible again as soon as both front doors are closed
In order to permit the intermittent wiping function even in the event of a defective door contact switch (S17/3, S17/4), the states of the door contact switches have no effect at speeds above 3 km/h.
A wipe cycle which has already commenced, is not interrupted. The wiper moves as far as the park position.
Networking
For the safety cutout, the signals of the front door contact switch are needed. These are read in by the rear SAM control module (N10/8) and are sent via the interior compartment CAN to the left front SAM control module (N10/1).
The vehicle speed signal comes from the instrument cluster (A1) via the interior compartment CAN to the left front SAM control module (N10/1).
Fault analysis:
- Failure of the serial communication interface to the left SAM control module (N10/6) - wiper motor
In the event of a failure of the serial communication interface or a fault report from the wiper motors (e.g.: Hall sensors defective), even when there is as yet no wiper request, an error message is sent from the left SAM control module (N10/6) via the interior compartment CAN to the instrument cluster (A1).
The rain sensor and light information are sent from the overhead control panel control module (N70) only in the event of changes.
Fault report of the wiper
If, due to the internal thermal protection, the wiper signals the overload bit, this is signaled by the left SAM control module (N10/6) to the instrument cluster as a wiper fault.
Failure or lack of CAN communication to the overhead control panel
In the event of an incorrect message, the wiper request is rejected and only responded to again with the next correct message. In the event of five incorrect messages, the intermittent wipe control takes place as under 1 (T = 5 s +/- 1 s). If correct communication with the rain/light sensor (B38/2) can be established again, then the system switches back to rain/light sensor mode.
No fault is displayed in the instrument cluster.
Wiper startup suppression
Suppression of the wiper function with the driver or passenger door open to prevent accidents.
The wiper function is suppressed when:
- Combination switch (S4) is in position 1 (intermittent stage)
- Driver or passenger door is open
- v < 5 km/h and
- Shift lever position is in P or N
If the driver or passenger door is open at v > 3 km/h, there is no wiper startup suppression.
Actuation of the wiper after a suppressed actuation takes place if:
- the wiper switch has been pressed
- an engaged drive position is detected, or a gear is engaged
- v > 3 km/h
Timeout of the wiper startup suppression
For door contacts (rear SAM): doors closed (default value) For combination switch (S4) request (electronic ignition switch/steering column module): last valid value
For v-signal: v > 3km/h
The function can be coded out.
Anti-lock protection, lock detection, stopping, final wiping
The functions are carried out independently by the UWA (reversal wiper system).
Special case for wiper startup suppression
A wipe cycle that has already been initiated (with request via combination switch (S4) "position 1" or "final wiping") is not interrupted by opening the driver or passenger doors. The wiper movement takes place until it reaches the park position. Further wiper requests (with combination switch (S4) "position 1") are, however, suppressed with the above-described criteria.
| Wiper system automatic speed reduction, function | GF82.30-P-4006S |