Lincoln Nautilus: Wipers and Washers / Wipers and Washers - System Operation and Component Description. Description and Operation

System Operation

System Diagram

Network Message Chart

  SCCM Network Input Messages

  BCM Network Input Messages

Windshield Wipers

The wiper relay is energized when the ignition is on and provides voltage to the windshield wiper motor, the rain sensor, the washer pump relay and the rear window wiper motor.

The SCCM monitors the wiper/washer switch inputs and sends the wiper/washer switch data to the windshield wiper motor through a LIN circuit.

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 windshield wiper motor 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 windshield 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. If equipped with a front camera, washer solvent is also directed to the front camera lens when the washer pump is active. When the switch is released, the windshield wiper motor continues to activate for 3 additional wipes and then turn off.

Ground for the washer pump is provided through the rear window washer relay located within the BJB .

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 set to 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.

Rear Window Wiper

When the wiper/washer switch is in the INT 1 or INT 2 (continuous wipe) position, the SCCM sends the request to the windshield wiper motor through the LIN . When the request is received, the windshield wiper motor momentarily supplies ground to the rear window wiper motor, activating the motor. The position of the wiper/washer switch determines how many times per minute the windshield wiper motor provides ground to activate the rear window wiper motor.

The rear window wiper motor is self-parking.

Rear Window Washer

When the rear window washer switch is activated, the SCCM sends the request to the windshield wiper motor through the LIN . The windshield wiper motor energizes the rear washer relay (located in the BJB ) and activates the rear window wiper motor. When the windshield wiper motor activates the rear window wash relay, voltage is provided to the washer pump, directing washer fluid to the rear window.

Ground for the washer pump is provided through the windshield washer relay within the windshield wiper motor.

Headlamp Washer (if equipped)

The headlamp washers only operate when the headlamps are on.

The BCM monitors the headlamp switch status and communicates this data to the SCCM over the CAN .

The SCCM sends the request to the windshield wiper motor through the LIN to activate the headlamp washer function if all of the following conditions are present:

• The headlamps are on (headlamp switch in on position or if in the auto position and the autolamp system has turned on the exterior lamps).
• A request for the windshield washer is detected.
• The headlamp washer has not been activated within the previous 10 minutes or 5 windshield wash requests have occurred.

When the headlamp wash is requested, the windshield wiper motor activates the headlamp washer relay (located in the BJB ) by providing ground to the coil side of the headlamp washer relay. When the relay energizes, voltage is provided to the headlamp washer pump.

When the headlamp washer pump activates, it provides high pressure washer fluid to the headlamp washer jets. The headlamp washer jets extend and apply high pressure washer fluid to the headlamp lenses.

System Diagram - Heated Wiper Park

Network Message Chart

  FCIM Network Input Messages

Heated Wiper Park

The heated wiper park activates or deactivates in conjunction with the rear window defrost.
Refer to: Glass, Frames and Mechanisms (501-11) .

Component Description

Wiper/Washer Switch

The wiper/washer switch is mounted directly to the SCCM . The windshield wiper/washer inputs to the SCCM are:

• Mist wipe
• Windshield wash
• Off
• AUTO 1/INT 1
• AUTO 2/INT 2
• AUTO 3/INT 3
• AUTO 4/INT 4
• AUTO 5/INT 5
• AUTO 6/INT 6
• Low
• High

The rear wiper/washer inputs to the SCCM are:

• Off
• INT 1
• INT 2 (continuous wipe)
• Rear window wash

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 front and rear washer system share the same washer reservoir and a bi-directional washer pump. 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. Ground for the washer pump is provided through the rear washer relay (located in the BJB ). When activated, the washer pump delivers washer fluid to the windshield.

When the windshield wiper motor energizes the rear washer relay, the rear washer relay provides voltage to the washer pump. Ground for the washer pump is provided through the windshield washer relay (internal to the windshield wiper motor). When activated, the pump delivers washer fluid to the rear window.

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 cannot be replaced separately on a rain sensor of this type.

Rear Wiper Motor

The rear window wiper motor contains an integrated relay and a single speed motor. When the windshield wiper motor momentarily energizes the integrated relay within the rear wiper motor, the rear window wiper activates. The integrated relay is used to continue the rear window wipe and park the wiper motor.

Headlamp Washer Pump

The headlamp washer pump is a high pressure washer pump controlled by the headlamp washer relay. When activated, it provides high pressure washer fluid to the headlamp washer jets.

Heated Wiper Park Grid

The heated wiper park grid is embedded in the windshield glass in the location of the windshield wiper blade park position. If damaged, the heated wiper park grid cannot be serviced separately from the windshield, and a new windshield must be installed.