WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO GROUP 8M - PASSIVE
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING WHEEL, STEERING COLUMN, OR
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
(1) Check the fuse in the junction block. If OK, go
to Step 2. If not OK, repair the shorted circuit or
component as required and replace the faulty fuse.
(2) Turn the ignition switch to the On position.
Check for battery voltage at the fuse in the junction
block. If OK, go to Step 3. If not OK, repair the open
circuit to the ignition switch as required.
(3) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Unplug the multi-function switch wire harness con-
nector. Connect the battery negative cable. Turn the
ignition switch to the On position. Check for battery
voltage at the fused ignition switch output (run/ac-
cessory) circuit cavity of the multi-function switch
wire harness connector. If OK, go to Step 4. If not
OK, repair the open circuit to the fuse in the junction
block as required.
(4) If the problem being diagnosed involves only
the intermittent wipe feature, go to Step 5. If the
problem being diagnosed involves all wiper modes, or
only the Low and/or High speed modes, go to Step 7.
(5) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Move the Central Timer Module (CTM) from its
mounting position far enough so that the CTM wire
harness connectors can be accessed. Refer to Central
Timer Module in the Removal and Installation sec-
tion of Group 8E - Instrument Panel Systems for the
procedures. Unplug the 14-way CTM wire harness
connector. Check for continuity between the wiper
switch mode sense circuit cavities of the multi-func-
tion switch wire harness connector and the CTM
14-way wire harness connector. There should be con-
tinuity. If OK, go to Step 6. If not OK, repair the
open circuit as required.
(6) Check for continuity between the windshield
wiper switch signal circuit cavities of the multi-func-
tion switch wire harness connector and the CTM
14-way wire harness connector. There should be con-
tinuity. If OK, see Intermittent Wipe Relay in the
Diagnosis and Testing section of this group. If not
OK, repair the open circuit as required.
(7) Check for continuity between the two wiper
switch low speed output circuit cavities of the multi-
function switch wire harness connector. There should
be continuity. If OK, go to Step 8. If not OK, repair
the open circuit as required.
(8) Test the wiper switch. See Wiper Switch and
Washer Switch in the Diagnosis and Testing section
of this group for the procedures. If the switch tests
OK, plug in the multi-function switch wire harness
connector and go to Step 9. If not OK, replace the
faulty switch and test the wiper system operation. If
still not OK, go to Step 9.
(9) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Move the wiper module far enough to access the
wiper motor wire harness connector. Measure the
resistance between the ground circuit cavity of the
wiper motor wire harness connector and a good
ground. The meter should read zero ohms. If OK, go
to Step 10. If not OK, repair the circuit to ground as
required.
(10) Connect the battery negative cable. Turn the
ignition switch to the On position. Place the multi-
function switch in the positions indicated in the tests
below, and check for battery voltage at the wiper
motor wire harness connector.
(a) Check for battery voltage at the fused igni-
tion switch output (run/accessory) circuit cavity of
the wiper motor wire harness connector with the
wiper switch in any position. If OK, go to Step b. If
not OK, repair the open circuit as required.
(b) Check for battery voltage at the wiper switch
low speed output circuit cavity of the wiper motor
wire harness connector with the wiper switch in
the Low position. If OK, go to Step c. If not OK,
repair the open circuit as required.
(c) Check for battery voltage at the wiper switch
high speed output circuit cavity of the wiper motor
wire harness connector with the wiper switch in
the High position. If OK, go to Step d. If not OK,
repair the open circuit as required.
(d) Check for battery voltage at the wiper park
switch sense circuit cavity of the wiper motor wire
harness connector with the wiper switch in the
Low or High position, then move the switch to the
Off position. The meter should switch between bat-
tery voltage and zero volts while the wipers are
cycling. The meter should read battery voltage
when the switch is moved to the Off position until
the wipers park, and then read a steady zero volts.
If not OK, replace the faulty wiper motor.
REAR
If the problem being diagnosed involves only the
rear wipe-after-wash mode, check the rear washer
motor control circuit between the rear washer motor
wire harness connector and the rear wiper motor
wire harness connector for shorts or opens. If the cir-
cuit checks OK, replace the faulty rear wiper motor.
For circuit descriptions and diagrams, refer to 8W-53
- Wipers in Group 8W - Wiring Diagrams.
8K - 6 WIPER AND WASHER SYSTEMS DN
DIAGNOSIS AND TESTING (Continued)
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