Jeep 1997 Grand Cherokee Service Manual page 484

MULTIFUNCTION SWITCH PINS
8K - 8 WIPER AND WASHER SYSTEMS
DIAGNOSIS AND TESTING (Continued)
Fig. 2 Multi-Function Switch Continuity
(2) Using an ohmmeter, check the switch continu-
ity at the switch terminals as follows:
a. With the switch in the Off position, there should
be no continuity between any two switch terminals.
b. With the switch knob depressed in the Wash
position, there should be continuity between the
fused ignition switch output circuit and the rear
washer motor control circuit terminals.
c. With the switch in the Intermittent position,
there should be continuity between the fused ignition
switch output circuit and the rear wiper motor con-
trol (intermittent) circuit terminals.
d. With the switch in the On position, there should
be continuity between the fused ignition switch out-
put circuit and the rear wiper motor control circuit
terminals.
(3) If the switch fails any of the continuity checks,
replace the faulty switch. If the switch is OK, repair
the rear wiper system and/or washer system wire
harness circuits as required.
INTERMITTENT WIPE RELAY
For circuit descriptions and diagrams, refer to
8W-53 - Wipers in Group 8W - Wiring Diagrams.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO
RESTRAINT SYSTEMS
STEERING WHEEL,
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
GROUP 8M - PASSIVE
BEFORE ATTEMPTING
STEERING COLUMN,
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
RELAY TEST
The intermittent wipe relay is located in the Power
Distribution Center (PDC) in the engine compart-
ment. Refer to the PDC label for intermittent wipe
relay identification and location.
Remove the intermittent wipe relay from the PDC
as described in this group to perform the following
tests:
(1) A relay in the de-energized position should
have continuity between terminals 87A and 30, and
no continuity between terminals 87 and 30. If OK, go
to Step 2. If not OK, replace the faulty relay.
(2) Resistance between terminals 85 and 86 (elec-
tromagnet) should be 75
3. If not OK, replace the faulty relay.
(3) Connect a battery to terminals 85 and 86.
There should now be continuity between terminals
30 and 87, and no continuity between terminals 87A
and 30. If OK, see the Relay Circuit Test in this
group. If not OK, replace the faulty relay.
Intermittent Wipe Relay
RELAY CIRCUIT TEST
(1) The relay common feed terminal cavity (30) is
connected to the wiper (multi-function) switch. There
should be continuity between the cavity for relay ter-
minal 30 and the two fused ignition switch output
(V6) circuit cavities of the multi-function switch con-
nector at all times. If OK, go to Step 2. If not OK,
repair the open circuit(s) to the multi-function switch
as required.
(2) The relay normally closed terminal (87A) is
OR
connected to terminal 30 in the de-energized position.
There should be continuity between the cavity for
relay terminal 87A and the wiper park switch sense
circuit cavities of the wiper motor wire harness con-
nector and the white 24-way Body Control Module
NUMBER TERMINAL LEGEND COMMON FEED IDENTIFICATION
COIL GROUND
COIL BATTERY
NORMALLY OPEN
NORMALLY CLOSED
5 ohms. If OK, go to Step
ZG