Hummer H1 Service Manual page 857

12-84 Electrical System
Step
1 Remove the wiper switch from the instrument
panel. Turn the ignition to the "RUN" position
and the wiper switch to "HIGH". Using a DVOM
set to measure voltage, back probe the red wire
(CKT 61). Is the specified voltage present?
2 With the ignition switch in the RUN" position,
check the voltage at the yellow wire (CKT 65). Is
the specified voltage present?
3 Gain access to the wiper motor connector under
the windshield trim. Turn the ignition switch to
the "RUN" position and the wiper switch to the
"HIGH" position. Using a DVOM check the volt-
age at the red wire (CKT 61). Is the specified volt-
age present?
Step
1 Do the windshield wipers work normally on the
low and high speeds?
2 Remove the wiper switch from the instrument
panel. Disconnect the wiper switch from the har-
ness.Using a DVOM measure resistance between
terminals 2 and 3. Is the resistance below the
specified value?
3 Turn the ignition switch to the "RUN" position
and the intermittent wiper switch to "MEDIUM
DELAY" . Using a DVOM set to measure volt-
age, back probe the brown wire (CKT 945) at the
intermittent switch. Voltage should pulse from 12
volts to 0 volts every 2-7 seconds depending on
position of switch. Is the voltage in the specified
range.
4-1-00
_______________________________________________________
Windshield Wiper Motor Inoperative on High
Action
Windshield Wipers Intermittent Speeds Inoperative
Action
Value(s) Yes
12v Go to step 3.
12v Replace the
wiper switch.
12v Replace the
wiper motor.
Value(s) Yes
Go to step 2.
<.2 Ω
Connect the
intermittent
wiper switch to
the harness.
Go to step 3.
12v pulse Go to step 5.
2-7 seconds
®
No
Go to step 2.
Repair the open
or bad connec-
tion on CKT 65
between the
wiper switch
and fuse 7G.
Repair the open
or bad connec-
tion on CKT 61
Between the
wiper motor and
the wiper
switch.
No
Refer to the
diagnostic chart
for the specific
problem on the
standard wiper
diagnosis.
Replace the
wiper switch.
Go to step 4.