Front Wipers/Washers: Notes
DESCRIPTION
The front wiper system consists of the following components:
| 1. | Refer to FRONT WIPER ARMS AND BLADES . |
| 2. | Refer to LIGHT RAIN SENSOR MODULE (LRSM) . |
| 3. | Refer to STEERING COLUMN CONTROL MODULE (SCCM) - Activation controls. |
| 4. | Refer to BODY CONTROL MODULE (BCM) . |
| 5. | Refer to WASHER FLUID HOSES AND TUBES . |
| 6. | Refer to WASHER FLUID LEVEL SWITCH . |
| 7. | Refer to TWO-WAY WASHER PUMP - For the front and rear washer circuit. |
| 8. | Refer to WASHER FLUID RESERVOIR . |
| 9. | Refer to WIPER MOTOR AND LINKAGE . |
| 10. | Refer to WASHER FLUID NOZZLES - With integral check valves. |
Front and rear wipers and washers are standard equipment on this vehicle. Both wiper and washer systems are controlled by the right stalk of the SCCM which sends MUX signal inputs to the BCM to determine what function or functions of the system are activated or deactivated. The BCM controls the wiper and washer system by providing Low Side Driver (LSD) inputs to the relays in the BCM which activate the electric motors that drive the wiper or washer when selected by the driver. The Fused B+ output to the wiper and washer pump motors are protected by a 20 amp fuse in the BCM. The relays are not serviceable separately as they are soldered to the printed circuit board of the BCM.
The vehicle may be equipped with a rain detection sensor on the windshield. When rain/water is detected on the windshield, the system will automatically operate the wipers. The system uses an infrared sensor fitted behind the windshield in front of the interior rear view mirror. The sensor continuously sends infrared rays against the windshield to detect the presence of water on the glass; if detected, the sensor will send a signal on the Local Interface Network (LIN) data bus to the BCM, which will activate the wiper at the appropriate speed.
The rain sensor is built into an electronic LRSM which, in addition to detecting moisture on the windshield, enables the dusk function by measuring ambient light levels. According to this information and the sensitivity level set by the user, it controls both windshield cleaning and running lights.
OPERATION
Operating front wiper/washer conditions.
| Ignition Switch Status | Function That Can Be Activated |
|---|---|
| OFF | Servicing position |
| ON | Front wiper Windshield washer circuit |
| START | Windshield wiper - cut-off Windshield washer circuit - cut-off Note: If the rain sensor is present, automatic mode is selected by default during starting. |
Wiper activation controls on the right stalk of the SCCM.
The windshield wiper functions can be activated via the controls on the right stalk of the SCCM.
The control on the right stalk of the SCCM is electrically connected to the BCM. The BCM receives MUX signals (different levels of resistance according to the position of the lever) from the right stalk of the SCCM.
The BCM controls the windshield wiper motor directly.
The BCM activates the electric motor of the washer pump circuit in accordance with the command from the right stalk of the SCCM.