Hummer H1 (2002+). Manual — part 216

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Electrical System 12-89

®

05745159

Figure 12-98: Rear Wiper Motor Schematic

C42

REAR
WIPER
MOTOR

M

G4

66 RD

FUSE
11G
25 AMP

SWITCHED

12V

INTERMITTENT
RELAY

59 BK

C20-L13

62 LB

67 BR

C20-C

66 RD

G1

59 BK

REAR
WIPER
SWITCH

C3-A4

67 BR

REAR
WASHER
MOTOR

M

G2

58 BK

59 BK

FUSE
13G
25 AMP

65 YL

00-S12-015

G1

59 BK

G4

17 PP

SWITCHED

12V

38 RD

C1-67

C3-B1

BATT

MAXI
7W
20 AMP

64 LG

C41-59

C20-B

C1-70

C3-E4

943 TN

HEAD-
LAMP
SWITCH

C20-E

C41-D

C41-B

C

D

B

A

C41-C

4-1-00

12-90

Electrical System

_______________________________________________________

®

Left Heated Windshield Inoperative

Step

Action

Value(s)

Yes

No

1

Gain access to the heated windshield connections.
With the ignition in the “RUN” position, preform a
voltage drop test between the yellow wire (CKT 740)
and the black wire (CKT 59) going to the left hand
windshield. Turn the heated windshield “ON”. Is the
specified voltage present?

12v

Replace the

heated

windshield.

Go to step 2.

2

Using a DVOM check the resistance to ground at
the black wire (CKT 59) going to the left side
windshield. Does the resistance to ground meet
the specified range?

<.2

Ω

Go to step 3.

Repair the open

or bad connection

in CKT 59

between the

windshield and

G4.

3

Remove the left 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 wind-
shield switch to “ON”. Is the specified voltage
present?

12v

Go to step 4.

Repair the open

or bad connec-

tion in CKT 580

between the

heated wind-

shield switch

and Heated

windshield relay

(R-4).

4

With the ignition still in the run position. Preform
a voltage drop test between cavities 2 (CKT 59)
and 3 (CKT 738). Is the specified voltage present?

12v

Go to step 5.

Repair the open

or bad connection

in CKT 738

between fuse 2C

and R-4.

5

With a DVOM check the resistance between cav-
ity 5 (CKT 740) and the yellow wire (CKT 740)
going to the left side windshield. Does the resis-
tance meet the specified value?

<.2

Ω

Replace relay

R-4.

Repair the open

or bad connection

in CKT 740

between the left

side heated wind-

shield and R-4.

4-1-00

______________________________________________________

Electrical System 12-91

®

05745159

Right Heated Windshield Inoperative

Step

Action

Value(s)

Yes

No

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?

12v

Replace the

heated

windshield.

Go to step 2.

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?

<.2

Ω

Go to step 3.

Repair the open

or bad connection

in CKT 59

between the

windshield and

G4.

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?

12v

Go to step 4.

Repair the open

or bad connec-

tion in CKT 580

between the

heated wind-

shield switch and

the heated wind-

shield relay (R-2).

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?

12v

Go to step 5.

Repair the open

or bad connection

in CKT 738

between fuse 2C

and R-2.

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?

<.2

Ω

Replace relay

R-2.

Repair the open

or bad connection

in CKT 739

between the left

side heated wind-

shield and R-2.

4-1-00

12-92

Electrical System

_______________________________________________________

®

Both Heated Windshields Inoperative

Step

Action

Value(s)

Yes

No

1

Gain access to the heated windshield connections.
Using a DVOM check the resistance to ground on
the black wires at both windshields. Does the
resistance meet the specified value?

<.2

Ω

Go to step 2.

Repair the open

or bad connection

in CKT 59

between the

windshields and

G4.

2

Remove the heated windshield switch from the
bezel. Turn the ignition switch to the “RUN”
position and turn the heated windshield switch to
the “ON” position. Using a DVOM check the
voltage drop between the brown wire (CKT 580)
and the black wire (CKT 58). Is the specified volt-
age present?

12v

Repair the open

or bad connection

in CKT 580
between the

heated wind-

shield switch and

the relays.

Go to step 3.

3

Using a DVOM measure the resistance to ground on
the black wire (CKT 58) at the heated windshield
switch. Does the resistance meet the specification?

<.2

Ω

Go to step 4.

Repair the open

or bad connection

in CKT 58

between the

heated wind-

shield switch and

G4.

4

With the ignition in the “RUN” position and the
heated windshield switch in the “ON” position.
Use a DVOM to check for voltage at both tan
wires (CKT 83) at the heated windshield switch.
Is the specified voltage present?

12v

Replace the

heated wind-

shield switch.

Repair the open

or bad connec-

tion in CKT 83

between the

windshield

switch and fuse

1C interior.

4-1-00