| 501-16 Wipers and Washers | 2013 - 2014 MKZ |
| Description and Operation | Procedure revision date: 09/5/2013 |
System Operation
System Diagram
Network Message Chart
SCCM Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Vehicle speed | PCM | The SCCM uses vehicle speed information for the operation of the speed sensitive wiper function. |
| Message center feature configuration | IPC | The SCCM uses the message center feature configuration to enable/disable the courtesy wipe and the rain sensitive wiper features. |
BCM Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Front wiper status | SCCM | The BCM uses the wiper status information for the operation of the wiper activated headlamps feature. |
Windshield Wipers
The wiper relay, integrated into the BJB , is energized when the ignition is on and provides voltage to the windshield wiper motor and the rain sensor.
The SCCM monitors the wiper/washer switch inputs and sends the wiper/washer switch data to the windshield wiper motor through a LIN .
Based on the input, the windshield wiper motor activates the appropriate wash, low, high and intermittent or rain sense modes. The logic of the wiper operation is contained within the windshield wiper motor.
When the wiper/washer switch is in the high speed setting, the windshield wiper motor also receives a ground signal directly from the SCCM (bypassing the logic within the module). This fail-safe circuit makes sure the windshield wipers function in high speed mode in the event of a LIN communication failure.
Mist Wipe
When the mist wipe function is activated, the SCCM sends the request to the windshield wiper motor over the LIN to perform a single wipe of the windshield. The windshield wipers operate for as long as the mist wipe function is active.
Windshield Washer
When the wiper/washer switch is activated, the SCCM sends the washer request to the windshield wiper motor over the LIN . The windshield wash relay is internal to the windshield wiper motor. When the windshield wiper motor activates the windshield wash relay, voltage is provided to the washer pump, directing washer fluid to the windshield. When the switch is released, the windshield wiper motor continues to activate for 3 additional wipes and then turn off.
Courtesy Wipe
When the windshield washer is requested, a few seconds after the windshield wash cycle has completed, an additional wipe of the windshield occurs to clear any fluid remaining on the windshield.
The courtesy wipe feature can be configured on/off through the message center.
Intermittent Wipers
When the wiper/washer switch is in an intermittent setting, the windshield wiper motor activates at timed intervals. The lower the setting, the longer the interval between wipes.
Speed Dependent Wipers
When the wiper/washer switch is in an intermittent setting, the speed dependent feature increases the frequency of wiping as the vehicle speed increases to compensate for the extra moisture that accumulates on the windshield.
The SCCM receives the vehicle speed from the PCM . The SCCM then sends the vehicle speed data to the windshield wiper motor through the LIN .
Rain Sensitive Wipers (if equipped)
When equipped, the rain sensitive wiper feature replaces the intermittent wiper feature. The rain sensitive feature is active when the wiper/washer switch is in any of the 6 auto/intermittent sensitivity settings. The setting closest to OFF is the least sensitive to moisture, the highest setting being the most sensitive to moisture.
The rain sensor sends data through the LIN to the windshield wiper motor. Based on the data received from the rain sensor and the auto/intermittent setting from the wiper/washer switch, the system automatically activates and adjusts the wiper speed and frequency when moisture is detected on the windshield.
If a fault is detected with the rain sensitive feature, the windshield wipers change to a default intermittent mode. The timing of the wipers correspond to a standard intermittent setting based on the auto/intermittent sensitivity setting on the wiper/washer switch.
Wiper Activated Exterior Lamps
When the headlamp switch is in AUTO, the BCM turns the exterior lamps on within 10 seconds of the windshield wipers being activated by the wiper/washer switch. Approximately 60 seconds after the windshield wipers turn off, the BCM turns the exterior lamps off.
If the rain sensitive wipers are activated by moisture detected on the windshield when the headlamp switch is in the AUTO position, the BCM turns the exterior lamps on after a time delay. Shortly after the rain sensitive wipers are deactivated (moisture no longer detected on the windshield), the BCM turns the exterior lamps off after a time delay.
Component Description
Wiper/Washer Switch
The wiper/washer switch is mounted directly to the SCCM . The windshield wiper/washer inputs to the SCCM are:
Windshield Wiper Motor
The windshield wiper motor contains a logic module, internal sensors to monitor the wiper arm position, and a multi-speed motor. The logic module from the windshield wiper motor continuously monitors the wiper/washer switch inputs from the SCCM and the rain sensor when the ignition is on. Depending on the input, the wiper motor activates to achieve the desired request.
The windshield wiper motor is mounted to the wiper and linkage assembly.
Washer Pump
The washer pump is controlled by the windshield wiper motor. The washer pump delivers washer fluid to the windshield when the windshield wiper motor activates the windshield washer relay (internal to the windshield wiper motor), which provides voltage to the washer pump.
Rain Sensor
The rain sensor uses an infrared beam to optically sense water on the windshield. The intensity of the reflected beam is measured and compared to the intensity of the transmitted beam. If there is water on the surface of the windshield the beam distorts, reducing the intensity of the beam. If the beam is not reflected completely, it is interpreted as rain on the windshield and the windshield wipers are activated.
A gel-type lens is used as the interface between the rain sensor and the windshield. If the lens is missing or damaged, the rain sensing wipers can be inoperative. The rain sensor gel-type lens can be replaced separately on a rain sensor of this type.
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