Headlight washing, detailed description
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Headlight washing, detailed description
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A washer nozzle is mounted on a telescopic cylinder in the bumper in front of each headlight. A cover hides the washer nozzle within the bumper when the system is inactive. During washing the cylinder raises the nozzle up from the bumper and two jets are directed at the headlight glass.
Headlight washing is started when the windscreen washer switch (61) is activated for more than 0.6 seconds. The ignition must be ON, the headlights switched on and the vehicle speed less than 200 km/h in order that the washing shall start. The washing period is 1.3 seconds.
Further headlight washing is prevented until a period of 120 seconds has elapsed since the previous wash or until windscreen washing has been activated 5 times. If however the ignition is switched off and on, the headlight washing will start directly when the headlight washer switch (61) is activated.
If the washer fluid level is less than 1 litre the UEC will not start the washer pump. The UEC transmits the bus message "Washer fluid, level low" ON which the MIU receives in order to display a message on the SID.
When windscreen washing is activated with the wiper stalk, CIM (703) sends the bus message "Windscreen washer, stalk active ON" provided that the ignition is ON. This bus message is used by UEC (342) to activate the headlamp washer relay (667). B+ voltage is supplied from UEC (342) pin 22 (F) to the headlamp washer pump, which starts.
The following preconditions must be satisfied before headlight washing will occur:
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Ignition in ON position
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EU:
Parking lights or dipped beam on
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Vehicle speed less than 200 km/h
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More than 120 seconds have elapsed since the washer pump was last activated, or the windscreen washer has been activated 5 times since the last headlight wash.
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The washer fluid level is not low.
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