Intermittent Wipe Relay; Washer Nozzle And Plumbing - Jeep 1997 Grand Cherokee Service Manual

8K - 4 WIPER AND WASHER SYSTEMS
DESCRIPTION AND OPERATION (Continued)
modes. On models with the optional automatic head-
lamps, the BCM can be programmed to automatically
turn on the headlamps when the windshield wipers
are turned on. Refer to the proper Body Diagnostic
Procedures manual for more information on enabling
or disabling this feature.
The BCM is programmed to energize or de-energize
the intermittent wipe relay in response to certain
inputs from the multi-function switch and the wind-
shield wiper motor park switch. For the speed sensi-
tive intermittent wipe feature, the BCM also uses an
input from the vehicle speed sensor, which is received
on the CCD data bus from the Powertrain Control
Module (PCM).
The BCM is mounted under the driver side out-
board end of the instrument panel, behind the instru-
ment panel support
outboard switch pod. Refer to Group 8E - Instrument
Panel Systems for the removal and installation pro-
cedures. For diagnosis of the BCM or the CCD data
bus, refer to the proper Body Diagnostic Procedures
manual. The BCM can only be serviced by an autho-
rized electronic repair station. Refer to the latest
Warranty Policies and Procedures manual for a cur-
rent listing of authorized electronic repair stations.

INTERMITTENT WIPE RELAY

The intermittent wipe relay is a International
Standards Organization (ISO) micro-relay. The termi-
nal designations and functions are the same as a con-
ventional ISO relay.
terminal orientation (or footprint) is different, cur-
rent capacity is lower, and the relay case dimensions
are smaller than those of the conventional ISO relay.
The intermittent wipe relay is a electromechanical
device that switches battery current to the wind-
shield wiper motor or wiper motor park switch when
the relay coil is grounded by the Body Control Mod-
ule (BCM) in response to inputs from the windshield
wiper (multi-function) switch. See the Diagnosis and
Testing section of this group for more information on
the intermittent wipe relay.
The intermittent wipe relay is located in the Power
Distribution Center (PDC), in the engine compart-
ment. Refer to the PDC label for relay identification
and location.
The intermittent wipe relay cannot be repaired
and, if faulty or damaged, it must be replaced.
WASHER RESERVOIR
A single washer fluid reservoir is used for both the
front and rear washer systems. The washer fluid res-
ervoir is secured to the left front inner fender shield,
behind the front wheelhouse in the engine compart-
ment.
armature and below
However, the micro-relay
Each washer pump and motor unit has a threaded
nipple, which is installed through a rubber grommet
seal inserted in a hole near the bottom of the reser-
voir. A plastic nut and washer that secures the
washer pump nipple from the inside of the reservoir,
can be accessed through the reservoir filler neck.
The reservoir also has a provision for a washer
fluid level sensor. The sensor mounts in a hole in the
rearward facing side of the reservoir that is nearest
to the dash panel. Refer to Group 8E - Instrument
Panel Systems for diagnosis of the sensor.
The washer reservoir, filler cap, and sensor are
each available for service.
WASHER PUMP
The washer pumps and motors are mounted near
the the bottom of the washer reservoir. A threaded nipple
on the pump housing passes through a rubber grom-
met seal installed in a hole near the bottom of the
reservoir. A plastic nut and washer secures the
washer pump nipple from the inside of the reservoir.
A permanently lubricated and sealed motor is cou-
pled to a rotor-type pump. Washer fluid is gravity-fed
from the reservoir to the pump. When the motor is
energized, the pump pressurizes the washer fluid
and forces it through the plumbing to the nozzles.
The washer pump and motor unit cannot be
repaired. If faulty, the entire washer pump and
motor unit must be replaced.

WASHER NOZZLE AND PLUMBING

FRONT
Pressurized washer fluid is fed through a single
hose, attached to a barbed nipple on the front washer
pump. The hose is routed to a tee fitting located in
the cowl plenum area, beneath the cowl plenum cov-
er/grille panel. Hoses from the tee fitting are routed
to the two nozzles, which are snapped into openings
in the cowl plenum cover/grille panel, below the
windshield.
The two fluidic washer nozzles are not adjustable.
The nozzles and hose fittings cannot be repaired and,
if faulty or damaged, they must be replaced.
REAR
Pressurized washer fluid is fed through a single
hose, attached to a barbed nipple on the rear washer
pump. The hose is routed from the front of the vehi-
cle to the liftgate with the left side body wire har-
ness.
Above the liftgate opening the hose connects to a
check valve, which prevents washer fluid drain-back
or siphoning from occurring. From the check valve,
another single hose is routed through holes and
grommets in the upper liftgate opening panel and the
liftgate inner panel to the washer nozzle. The washer
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