Dodge Dakota Sport 2001 Service Manual page 587

8R - 18 WIPERS/WASHERS
WIPER RELAY (Continued)
the multi-function switch, and inputs from the wiper
motor park switch.
• The coil battery terminal (86) is connected to
battery current from a fuse in the Junction Block
(JB) through a fused ignition switch output (run-acc)
circuit whenever the ignition switch is in the On or
Accessory positions.
• The normally open terminal (87) is connected to
battery current from a fuse in the Junction Block
(JB) through a fused ignition switch output (run-acc)
circuit whenever the wiper relay control coil is ener-
gized by the CTM. This circuit provides fused igni-
tion switch output (run-acc) current to the wiper
motor low speed brush only when the wiper relay
control coil is energized.
• The normally closed terminal (87A) is connected
to the output of the wiper motor park switch through
the CTM on the front wiper park switch sense cir-
cuit. This circuit provides battery current (wipers are
not parked) or ground (wipers are parked) to the
wiper motor low speed brush whenever the wiper
relay control coil is de-energized and the Off position
of the wiper control circuitry within the multi-func-
tion switch is selected.
The wiper relay can be diagnosed using conven-
tional diagnostic tools and methods.
DIAGNOSIS AND TESTING - WIPER RELAY
The wiper relay (or intermittent wipe relay) (Fig.
12) is located in the Power Distribution Center (PDC)
in the engine compartment. See the fuse and relay
layout label affixed to the inside surface of the PDC
cover for wiper relay identification and location.
Refer to the appropriate wiring information. The wir-
ing information includes wiring diagrams, proper
wire and connector repair procedures, details of wire
harness routing and retention, connector pin-out
information and location views for the various wire
harness connectors, splices and grounds.
(1) Remove the wiper relay from the PDC. (Refer
to 8 - ELECTRICAL/WIPERS/WASHERS/WIPER
RELAY - REMOVAL).
(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 ± 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, test the relay input and output cir-
cuits. Refer to RELAY CIRCUIT TEST . If not OK,
replace the faulty relay.
Fig. 12 Wiper Relay
30 - COMMON FEED
85 - COIL GROUND
86 - COIL BATTERY
87 - NORMALLY OPEN
87A - NORMALLY CLOSED
RELAY CIRCUIT TEST
(1) The relay common feed terminal cavity (30) is
connected to the multi-function switch. There should
be continuity between the receptacle for terminal 30
of the wiper relay in the PDC and the intermittent
front wiper low speed circuit cavity of the instrument
panel wire harness connector for the multi-function
switch at all times. If OK, go to Step 2. If not OK,
repair the open intermittent front wiper low speed
circuit between the PDC and the multi-function
switch as required.
(2) The relay normally closed terminal (87A) is
connected to the wiper motor park switch through
the CTM on the front wiper park switch sense cir-
cuit. There should be continuity between the recepta-
cle for terminal 87A of the wiper relay in the PDC
and the front wiper park switch sense circuit cavity
of the headlamp and dash wire harness connector for
the wiper motor at all times. If OK, go to Step 3. If
not OK, repair the open front wiper park switch
sense circuit between the PDC and the wiper motor
as required.
(3) The relay normally open terminal (87) is con-
nected to a fused ignition switch output (run-acc)
fuse in the Junction Block (JB) through a fused igni-
tion switch output (run-acc) circuit. There should be
battery voltage at the receptacle for terminal 87 of
the wiper relay in the PDC whenever the ignition
switch is in the On or Accessory positions. If OK, go
to Step 4. If not OK, repair the open fused ignition
AN