times. Check for continuity between the cavity for
terminal 85 of the wiper high/low relay and a good
ground. If OK, refer to Wiper On/Off Relay in the
Diagnosis and Testing section of this group. If not
OK, repair the open ground circuit to ground as
required.
WIPER ON/OFF RELAY
The wiper on/off relay (Fig. 4) is located in the
Power Distribution Center (PDC) between the bat-
tery and the fender on the right side of the engine
compartment. See the fuse and relay layout label
affixed to the inside surface of the PDC cover for
wiper on/off relay identification and location. For
complete circuit diagrams, refer to Wipers in the
Contents of Group 8W - Wiring Diagrams.
(1) Remove the wiper on/off relay from the PDC.
Refer to Wiper Relays in the Removal and Installa-
tion section of this group for the procedures.
(2) 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 3. If not OK, replace the faulty relay.
(3) Resistance between terminals 85 and 86 (elec-
tromagnet) should be 75
6 5 ohms. If OK, go to Step
4. If not OK, replace the faulty relay.
(4) 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, perform the Relay Circuit Test that
follows. If not OK, replace the faulty relay.
RELAY CIRCUIT TEST
(1) The relay common feed terminal cavity (30) is
connected to the common feed terminal of the wiper
high/low relay. When the wiper on/off relay is de-en-
ergized, this terminal connects the wiper park switch
sense circuit to the wiper high/low relay. When the
wiper on/off relay is energized, this terminal connects
the fused ignition switch output from the wiper sys-
tem circuit breaker to the wiper high/low relay. There
should be continuity between the cavity for terminal
30 of the wiper on/off relay and the cavity for termi-
nal 30 of the wiper high/low relay at all times. If OK,
go to Step 2. If not OK, repair the open wiper on/off
relay output circuit to the common feed terminal cav-
ity for the wiper high/low relay in the PDC as
required.
(2) The relay normally closed terminal (87A) is
connected to the wiper park switch sense circuit.
There should be continuity between the cavity for
terminal 87A of the wiper on/off relay and the wiper
park switch sense circuit cavity of the windshield
wiper motor connector at all times. If OK, go to Step
3. If not OK, repair the open wiper park switch sense
circuit to the windshield wiper motor as required.
(3) The relay normally open terminal (87) is con-
nected to the fused ignition switch output circuit.
There should be battery voltage at the cavity for ter-
minal 87 of the wiper on/off relay when the ignition
switch is in the On or Accessory positions. If OK, go
to Step 4. If not OK, repair the open fused ignition
switch output circuit to the wiper system circuit
breaker in the junction block as required.
(4) The coil battery terminal (86) is also connected
to the fused ignition switch output circuit. There
should be battery voltage at the cavity for terminal
86 of the wiper on/off relay when the ignition switch
is in the On or Accessory positions. If OK, go to Step
5. If not OK, repair the open fused ignition switch
output circuit to the wiper system circuit breaker in
the junction block as required.
(5) The coil ground terminal (85) is connected to
the wiper on/off relay control circuit. It is grounded
by the Body Control Module (BCM) to energize the
wiper
on/off
relay.
There
should
be
continuity
between the cavity for terminal 85 of the wiper on/off
relay and the wiper on/off relay control circuit cavity
TERMINAL LEGEND
NUMBER
IDENTIFICATION
30
COMMON FEED
85
COIL GROUND
86
COIL BATTERY
87
NORMALLY OPEN
87A
NORMALLY CLOSED
Fig. 3 Wiper High/Low Relay
TERMINAL LEGEND
NUMBER
IDENTIFICATION
30
COMMON FEED
85
COIL GROUND
86
COIL BATTERY
87
NORMALLY OPEN
87A
NORMALLY CLOSED
Fig. 4 Wiper On/Off Relay
8K - 14
WIPER AND WASHER SYSTEMS
WJ
DIAGNOSIS AND TESTING (Continued)