Windscreen Wiper/Washer System ZKE
Windscreen Wiper/Washer System ZKE:
Functional Description:
Block Diagram Windscreen Wipe/Wash System:
No. Abb. Description
1 GM General module
2 RM Relay module
K5 Wash pump relay
K36 Wiper relay park position
K37 Wiper relay stage 1
K38 Wiper relay stage 2
K42 Intensive wash relay
M3 Wiper motor with reset contact
M4 Wash pump
M5 Intensive wash pump
S5 Wiper switch
General:
The windscreen wiper and washer system is controlled by the general module (GM) of the ZKE II. The wiper relays (3 individual relays), the wash relay (and the intensive wash relay if SIR is installed) are activated by the relay module (RM). The relay outputs are routed via diagnostic links to the general module (GM). All functions can be switched on and off with the wiper switch. The ignition switch must at least be in position 1 (terminal R).
During intermittent wipe, stage 1 and stage 2, the wipe speed and the wipe cycle are dependent on the vehicle speed.
Wipe/Wash Functions:
Park position: After completing a wipe or wash function, the wiper returns to a recessed park position (for reasons of aerodynamics). This function is achieved with a single relay which changes the polarity of the wiper motor.
Reset contact: By way of a reset contact integrated in the wiper motor, the general module (GM) detects the return of the wiper in the lower turn-round position.
Hold wipe function: The wiper motor operates in stage 1 for as long as the wiper switch is held in this position.
Intermittent wipe: The intermittent wipe cycle time depends upon the vehicle speed.
Intermittent wipe cycle time dependent on vehicle speed:
The intermittent wipe cycle time can also be freely programmed.
Procedure: Switch off wiper -> briefly switch on intermittent wipe function and immediately switch off again -> the time counter now begins to run, wait for the required cycle time -> switch on intermittent wipe function once again -> the time reading in the time counter is now stored as the intermittent wipe cycle time. It is retained for several seconds after the wiper is switched oft. It is immediately lost with terminal R OFF/ON. The newly programmed intermittent wipe cycle time is also influenced by the vehicle speed, however, the time can never drop below 3 s or exceed 25 s.
Wipe functions in stage 1 and 2: The wiper is switched over to another wipe cycle dependent on the vehicle speed.
Wiper stage switch over:
Wash:
Procedure: Wash pump operating -> Wiper starts time -> delayed in stage 1 -> Wash pump stops -> Wiper continues to operate. -> Below 100 km/h,a delayed dry wipe cycle takes place a few seconds later.
Optional extra intensive wash (SIR):
Procedure: Intensive wash pump operating, intensive wash fluid is applied to windscreen -> Wiper starts time-delayed in stage 1 -> Intensive wash pump stops -> Wash pump starts up -> Wash pump stops -> Wiper continues to operate and wipes the windscreen dry pr Below 100 km/h, a delayed dry wipe cycle is performed a few seconds later
Special Features:
Anti-blocking function: The signal of the reset contact is used for monitoring operation of the wiper motor. The wiper is switched off by the general module (GM) (anti-blocking function) if, with the wiper active, the general module (GM) receives no signal from the reset contact for longer than 16 5. Reasons for this could be mechanical stiffness of the wiper or breaks in the wiring. All activation signals of the wiper are inhibited when the anti-blocking function is active. The wiper does not return to the park position. The wiper can be switched on once again after 3 mm (= time lockout). The anti-locking function is triggered up to 10 times in succession, after this, the wiper motor remains blocked (= repeat lockout). The repeat lockout can only be reset by terminal R OFF/ON.
Fold-down position: It is not possible to fold down the wiper arms in the park position. The wiper arms must be set in the fold-down position for this purpose.
Procedure: Terminal R On Wiper switch in interval wipe setting Switch off terminal R at the moment, at which the wiper is in the rest position Wiper assumes the fold-down position