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