Hummer H1 (2002+). Manual — part 215

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Electrical System 12-85

®

05745159

4

Ignition should be in the “RUN” position. Using a
DVOM set to measure the voltage, back probe the
yellow wire (CKT 65) at the intermittent wiper
switch. Is the specified voltage present?

12v

Replace the
intermittent

wiper switch.

Repair the open

or bad connec-

tion in CKT 65

between the

intermittent

wiper switch

and fuse 7G.

5

Remove the intermittent wiper relay from the
fuse box. Turn the ignition switch to the “RUN”
position. Using a DVOM measure voltage drop
between cavity B1 (CKT 945) and cavity C3
(CKT 59). The voltage should pulse from 12 volts
to 0 volts every 2 to 7 seconds. Is the voltage in
the specified ranges?

12v pulse

2-7 seconds

Go to step 7.

Go to step 6.

6

Using a DVOM set to measure resistance, mea-
sure resistance to ground at cavity C3 (CKT 59)
of the fuse box. Is resistance below specification?

<.2

Ω

Repair the open

or bad connec-

tion, in CKT

945 between the

intermittent

wiper switch

and the intermit-

tent wiper relay.

Repair open or

bad connection

in CKT 59

between the

intermittent

wiper relay and

G4.

7

Turn the ignition to the “RUN” position. Use a
DVOM to measure voltage drop between cavity
C1 (CKT 65) and cavity C3 (CKT 59). Is the
specified voltage present?

12v

Go to step 8.

Repair the open

or bad connec-

tion in CKT 65

between fuse

7G and the

intermittent
wiper relay.

8

With the ignition switch in the “RUN” position
and the wipers on “LOW”, check the voltage drop
between cavity C2 (CKT 28) and cavity C3 (CKT
59). Does the voltage switch from 12 volts to 0
volts as the wiper completes its cycle?

0v – 12v – 0v

Replace the
intermittent
wiper relay.

Go to step 9.

9

Gain access to the wiper motor connection. Back
probe the black wire (CKT 65) with the positive
lead, and the brown wire(CKT 59) with the nega-
tive lead. With the ignition on is the voltage drop
in the specified range?

12v

Replace the

wiper motor.

Repair the open

or bad connec-

tion in CKT 65

between the

wiper motor and

fuse 7G

Windshield Wipers Intermittent Speeds Inoperative (Continued)

Step

Action

Value(s)

Yes

No

4-1-00

12-86

Electrical System

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®

Figure 12-97: Wiper/Washer Schematic

WIPER
MOTOR

65 BK

59 BR

C3-H8

C3-J6

63 DG

61 RD

28 DB

G4

27 OR

FUSE

7G

25 AMP

INTERIOR

FUSE BOX

TO

IGNITION

INTERMITTENT
RELAY

WIPER
SWITCH

C3-J7

C3-H7

27 OR

65 YL

570 BK

LOW
WASHER
FLUID
SWITCH

RIGHT HAND

STATUS

CENTER

LOW WASHER

FLUID LIGHT

C3-E3

C1-54

793 YL

G1

M

WASHER

MOTOR

M

G1

59 BK

C1-76

C3-N8

C3-N9

945 BR

INTERMITTENT

WIPER / WASHER

SWITCH

G4

59 BK

941 TN

G4

9-S12-012

FUSE

4B

5 AMP

INTERIOR

FUSE BOX

TO

IGNITION

SWITCH

C3-N7

C9-J

C9-H

30 GY

C44-B

C44-A

C43

A

B

C

65 YEL

WIPER/WASHER

4-1-00

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Electrical System 12-87

®

05745159

Rear Window Wiper Inoperative

Steps

Action

Values

Yes

No

1

Gain access to the wiper motor connector under
the slant door trim.Using a DVOM check resis-
tance on the black wire (CKT 59). Is the resis-
tance in the specified range?

<.2

Ω

Go to step 2.

Repair the open

or bad connec-

tion in CKT 59

between wiper

motor and G4.

2

Turn the ignition switch to the “RUN” position
and the rear wiper switch on. Using a DVOM
back probe the red wire (CKT 66). Is the specified
voltage present?

12v

Replace the

wiper motor.

Go to step 3.

3

Turn the ignition switch to the “RUN” position.
Unplug the wiper motor harness. With a DVOM
check the voltage on the light green wire
(CKT 64). Is the specified voltage present?

12v

Go to step 4.

Repair the open

or bad connec-

tion in CKT 64

between wiper

and fuse 11G.

4

Turn the ignition switch “OFF”. With a DVOM
check resistance between the light blue wire
(CKT 62) and the red wire (CKT 66) on the wiper
motor harness. Is resistance in the specified
range?

<.2

Ω

Go to step 7.

Go to step 5.

5

Remove the rear wiper relay (RY-3) from the inte-
rior fuse box. With a DVOM check the resistance
between cavity F3 in the interior fuse box (** 12-
153) and the red wire (CKT 66) in the rear wiper
motor harness. Is the resistance in the specified
range?

<.2

Ω

Go to step 6.

Repair the open

or bad connec-

tion in CKT 66

between rear

wiper and relay.

6

With a DVOM check resistance between cavity
G2 in the interior fuse box and the light blue wire
(CKT 62) in the rear wiper motor harness. Is the
resistance in the specified range?

<.2

Ω

Replace the

relay (RY-3).

Repair the open

or bad connec-

tion in CKT 62

between rear

wiper and relay.

7

Remove the rear wiper relay (RY-3). Turn the
ignition switch to the “RUN” position. With a
DVOM check voltage at cavity G1 in the interior
fuse box. Is the specified voltage present?

12v

Go to step 8.

Repair the open

or bad connec-

tion in CKT 64.

8

With a DVOM check cavity G3 in the interior
fuse box for a ground. Is a ground present?

<.2

Ω

Go to step 9.

Repair open or

bad ground.

9

Turn the ignition switch to the “RUN” position
and the rear wiper switch above the medium
selection. Using a DVOM, watch the voltage at
cavity F1 in the interior fuse box. Does the volt-
age pulse from 0v to 12v and back?

0v - 12v - 0v

Replace the

relay (RY-3).

Go to step 10.

4-1-00

12-88

Electrical System

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®

10

Remove the rear wiper switch from the instru-
ment panel. Disconnect the wiper switch harness
from the switch. Turn the ignition switch to the
“RUN” position. With a DVOM check voltage
on the yellow wire (CKT 65). Is the specified
voltage present?

12v

Go to step 11.

Repair the open

or bad connec-

tion on CKT 65.

11

With a DVOM check the black wire CKT 59 for
ground. Is a ground present?

<.2

Ω

Go to step 12.

Repair open or

bad ground

CKT 59.

12

Using a DVOM check the resistance between the
brown wire (CKT 67) and cavity F1 in the interior
fuse box. Is resistance in specified range?

<.2

Ω

Replace rear

wiper switch.

Repair open or

bad connection

in CKT 67.

Rear Window Wiper Inoperative (Continued)

Steps

Action

Values

Yes

No

4-1-00