PUMP-WASHER
DESCRIPTION
The washer pump/motor unit is located on the rear-
ward facing side of the washer reservoir, in the left
front fender wheel house ahead of the front wheel and
the left front wheel house splash shield. A small per-
manently lubricated and sealed reversible electric
motor (2) is coupled to the rotor-type washer pump
(4). The use of an integral valve body (6) allows the
washer pump/motor unit to provide washer fluid to
either the front or the rear washer systems, depending
upon the direction of the motor/pump impeller rotation.
A seal flange with a barbed inlet nipple (8) on the
pump housing passes through a rubber grommet seal
installed in a dedicated mounting hole of the washer
reservoir. A removable molded plastic filter screen (9)
inserted into the inlet nipple prevents most debris from
entering the pump housing. When the pump is
installed in the reservoir the front barbed outlet nipple
(5) on the pump valve body housing connects the unit
to the front washer hose, and the rear barbed outlet
nipple (7) connects the unit to the rear washer hose.
The letters “F” and “R” molded into the valve body
housing adjacent to each nipple provide further clarifi-
cation of the nipple assignments.
The washer pump/motor unit is retained on the reservoir by the interference fit between the barbed pump inlet nip-
ple and the grommet seal, which is a light press fit. The top of the washer pump is also secured to the washer
reservoir by the use of a snap post (1) on the motor and a snap post receptacle molded into the reservoir that
allows for mounting of the washer pump without the use of fasteners. An integral connector receptacle (2) on the top
of the motor housing connects the unit to the vehicle electrical system through a dedicated take out and connector
of the headlamp and dash wire harness.
The washer pump/motor unit cannot be repaired. If faulty or damaged, the entire washer pump/motor unit must be
replaced.
OPERATION
The washer pump/motor unit features a reversible
electric motor. The direction of the motor is controlled
by hard wired outputs from the Front Control Module
(FCM). When battery current and ground are applied
to the two pump motor terminals, the motor rotates in
one direction. When the polarity of these connections
is reversed, the motor rotates in the opposite direction.
When the pump motor is energized, the rotor-type
pump pressurizes the washer fluid and forces it
through one of the two pump outlet nipples, and into
the front or rear washer plumbing.
The FCM controls the hard wired outputs to the pump motor based upon electronic washer request messages
received over the Controller Area Network (CAN) data bus from the ElectroMechanical Instrument Cluster (EMIC).
The EMIC monitors a resistor multiplexed input from the front washer switch circuitry contained within the multi-
HB
FRONT WIPERS/WASHERS - SERVICE INFORMATION
8R - 51