All windscreen wiper functions in the E70 can be operated with the wiper switch as of terminal R On. The windscreen wipers are driven by an electric motor with a reduction gear.
The following components are described for the windscreen wipers:
The wiper switch is operated with one touch. The wiper switch does not lock into place. The wiper switch sends its signals to the steering column switch cluster (SZL).
The SZL forms the interface between the wiper switch and the junction box electronics (JBE). The signals from the wiper switch are processed by the SZL and forwarded to the Dynamic Stability Control (DSC). The SZL sends its information via the F-CAN to the DSC.
The DSC processes the information from the SZL. The DSC forwards the requests from the SZL and the information regarding driving speed to the junction box electronics (JBE). The DSC is connected to the JBE via the PT-CAN.
The JBE processes the information from the DSC and the roof function centre (FZD). The JBE controls the load switching for the wiper motors and windscreen washing pumps. The load switching of the wiper motors takes place via internal relays. The washer fluid level switch sends its information to the JBE.
On vehicles with a rain/light solar sensor (RLSS), this handles the automatic intermittent control. The rain/light solar sensor (RLSS) is fitted in the mirror base on the windscreen. This means that wiper operation depends on the rain intensity and driving speed. The RLSS sends its request, e.g. wipe, to the roof function centre (FZD). In the case of equipment without RLSS, is the interval for windscreen wiper operation is specified.
The instrument receives information on the outside temperature from the outdoor temperature sensor. The instrument cluster forwards the information across the K-CAN to the JBE.
The FZD receives the message from the RLSS. The FZD forwards the message on the K-CAN to the JBE.
The wiper motor is a rotary motor without electronic modules. The wiper motor is configured for two different wiper speeds. The wiper motor is activated via two internal relays. The wiper motor's end position (off position) is detected by a reset contact integrated in the wiper motor. The reset contact switches earth to the JBE as soon as the wiper motor has reached the end position (rest position). The reset contact is also used for monitoring the wiper motor.
The rear wiper motor has the same structure as the front wiper motor. The rear wiper motor is electrically activated via an integrated relay in the JBE.
The windscreen washing pumps for the front and rear are attached to the washer fluid container. The windscreen washing pumps are electrically activated by the JBE.
The washer jets are heated electrically. This prevents the washer jets freezing in cold weather. The washer-jet heating system consists of heating resistors. The heated washer jets are electrically activated via the JBE at an outside temperature below 3 °C.
The headlight-cleaning system is offered as an optional extra. The JBE handles activation of the washer pump for the headlight-cleaning system. Headlight cleaning only takes place when the low-beam headlight is switched on. The headlight cleaning is activated every 5th time the washing or intensive cleaning is activated. Switching off terminal R resets the repeat lock-out and the counter for wash operations.
Washer fluid container E70
Index |
Explanation |
Index |
Explanation |
|---|---|---|---|
1 |
Washer fluid container |
2 |
Front windscreen washing pump |
3 |
Rear windscreen washing pump |
4 |
Wash pumps for headlight-cleaning system |
5 |
Windscreen wash fluid-level switch |
|
|
Block circuit diagram E70
Index |
Explanation |
Index |
Explanation |
|---|---|---|---|
1 |
Outside temperature sensor |
2 |
Heated washer jet, left |
3 |
Heated washer jet, right |
4 |
Windscreen wash fluid-level switch |
5 |
Wash pumps for headlight-cleaning system |
6 |
Front windscreen washing pump |
7 |
Rear windscreen washing pump |
8 |
Junction box electronics (JBE) |
9 |
Rear wiper motor |
10 |
Instrument cluster |
11 |
Roof control panel |
12 |
Rain/light solar sensor (RLSS) |
13 |
Front wiper motor |
14 |
Steering Column Switch (SZL) |
15 |
DSC (Dynamic Stability Control) |
The following system functions are described for the windscreen wipers:
The wiper functions can be operated as of terminal R.
The following wiper functions are possible:
The windscreen-washer functions are available as soon as Terminal R status is ON. To operate the windscreen washer, the wiper switch is pulled backwards (towards driver). To wash the rear window, the wiper switch must be pushed forwards (away from the driver).
When the dipped headlights are switched on, the headlamps are washed every 5th time the windscreen washer is operated.
If the wiper motor is switched on and the signal from the reset contact is not detected for approx. 16 seconds, the wiper motor is switched off to protect against overload. It is only possible to switch the wiper motor on again after:
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