Right Heated Windshield Inoperative - Hummer H1 Service Manual

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Step
1 Gain access to the heated windshield connections.
With the ignition in the "RUN" position and the
heated windshield switch on, preform a voltage drop
test between the purple wire (CKT 739) and the black
wire (CKT 59) going to the right hand windshield.
Turn the heated windshield "ON". Is the specified
voltage present?
2 Using a DVOM check the resistance to ground at
the black wire (CKT 59) going to the right side
windshield. Does the resistance to ground meet
the specified range?
3 Remove the right hand heated windshield relay from
the exterior fuse box. Check the voltage drop
between cavities 1 (CKT 580) and 2 (CKT 59). With
the ignition in the "RUN" position, turn the heated
windshield switch to "ON". Is the specified voltage
present?
4 With the ignition still in the "RUN" position. Preform
a voltage drop test between cavities 2 (CKT 59) and
3 (CKT 737). Is the specified voltage present?
5 With a DVOM check the resistance between cav-
ity 5 (CKT 739) and the purple wire (CKT 739)
going to the right side windshield. Does the resis-
tance meet the specified value?
05745159

Right Heated Windshield Inoperative

Action
Electrical System
Value(s) Yes
12v Replace the
heated
windshield.
<.2 Ω
Go to step 3.
12v Go to step 4.
12v Go to step 5.
<.2 Ω
Replace relay
R-2.
12-91
No
Go to step 2.
Repair the open
or bad connection
in CKT 59
between the
windshield and
G4.
Repair the open
or bad connec-
tion in CKT 580
between the
heated wind-
shield switch and
the heated wind-
shield relay (R-2).
Repair the open
or bad connection
in CKT 738
between fuse 2C
and R-2.
Repair the open
or bad connection
in CKT 739
between the left
side heated wind-
shield and R-2.
4-1-00