Wiper Functions

Wiper functions

Wash/wipe
The right lever has four functions for washing/wiping in S40, and six functions in V40 (rear window washer/wiper).
- up function: impulse
- off function: 0
- three down: interval, speed 1, speed 2
- pull: wash windshield
In V40:
- shift: rear wiper
- press: washer rear

Interval time
The interval's duration for the windshield wipers (and rear wiper due to the synchronization function) varies with the speed of the car.






Rheostat
The rheostat can control the light intensity in 16 steps, with a 12% to 100% activation cycle.
If the key is in position 2, the rheostat controls the light intensity of the instrument lighting in the passenger compartment.
- combination instrument
- heater instrument
- radio
Central electronic module (CEM) reads off the thumb wheel's status (resistance) which is located beside the light switch, which then controls the light with an activation cycle.

Rear window wiper
The rear window wiper is synchronized with the windshield wipers. It wipes at every other stroke of the windshield wipers if they are controlled by interval wiping. If the windshield wipers are activated continuously the rear window wiper's interval is twice as long as in the above table.
If the windshield wipers are activated (continuously or interval) and reverse gear is engaged, the rear window wiper is automatically activated for two strokes.
An impulse function can be started by briefly activating the washer function.

Washing
Both rear window and windshield washers work in three phases.
- Prewash: the pump is activated for a certain time and the wipers remain in the parking position
- Washing: the pump and wipers are active for as long as the washer switch is actuated
- After washing; the pump is off and the wipers are active for at least two complete strokes, with an extra stroke three seconds later.
With the lever in position 0 and washer function requested, three phases follow.
If speeds 1, 2, or impulse is active and the washer function is requested, the washer pump is engaged for as long as the switch is active. Return takes place to speeds 1, 2, or impulse.
If interval wiping is active when the washer function is requested, then interval wiping is interrupted and the three phases start. After the three phases have been finished interval wiping resumes.

Glow plug monitor
When the key is in positions 2 or 3, the Central electronic module (CEM) controls the brake lights with regards to any problems.
The control light in the combination instrument lights up for 3 seconds and goes off even if the brake is not applied. Should a problem occur, the control lights light up and stay on when the brake is applied.