PRE-RELEASE
Windscreen wipers
| Windscreen wipers |
The windscreen wiper assembly is located under the cover beneath the windscreen.
The windscreen wipers are controlled by a changeover switch on the right-hand side of the steering column.
The assembly comprises a motor, two wiper arms and an arm linkage that converts motor rotation into wiper movement.
There is a built-in thermoswitch in the motor that trips if the control switch has been activated and the blades have jammed (frozen).
The wiper switch has three positions:
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Intermittent (J)
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Low speed
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High speed
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There is a function in the intermittent position that enables the frequency of strokes to be regulated by a potentiometer. The wipers come on at an interval of 2-15 seconds depending on the setting selected. The potentiometer for the intermittent wiper controls the DICE control module which operates the wiper relay.
| Intermittent (J) |
There is a built-in mechanically controlled connector (31B) in the wiper motor that receives power, regardless of the switch's (61) position. As a result, the intermittent function only requires a start pulse from DICE to become active.
When the switch is placed in position (J), power is supplied from pin 10 in the switch (61) to pin 21 in DICE (628). The control module emits a start pulse from pin 58 which activates the relay (83). Input voltage is supplied to pin 9 in the switch (61), with output voltage at pin 8. The power supplied to pin 3 in the motor (62F) is equivalent to the low-speed position.
The potentiometer (618) in the switch (61) is connected to DICE (628) at pins 55 and 33. Resistance varies between 0 and 1 kohm. The lower value is equivalent to the short interval (2 seconds) and the higher value to the long interval (15 seconds).
Connector (31B) controls the power supply so that the wiper motor always returns to the parking position once the supply of power from the switch has been broken. When the wiper motor reaches the parking position, the mechanically controlled connector breaks the supply of power and the motor stops until it receives the next start pulse from DICE.
The wiper motor has a built-in mechanically controlled connector that receives power regardless of the switch's position.
The connector controls the power supply so that the wiper motor always returns to the parking position once the supply of power from the switch has been broken. When the wiper motor reaches the parking position, the mechanically controlled connector breaks the supply of power and the motor stops.
| Low speed (I) |
The windscreen wipers operate with approximately 48 double strokes per minute.
When the switch (61) is placed in position (I), +54 voltage is supplied to the switch via fuse 37. Pin 8 in the switch supplies power to pin 3 in the motor (62F).
| High speed (II) |
The windscreen wipers operate with approximately 73 double strokes per minute.
When the switch (61) is placed in position (II), +54 voltage is supplied to the switch via fuse 37. Pin 7 in the switch supplies power to pin 4 in the motor (62F).
