Hummer H1 (2006+). Manual — part 350

12-76

Electrical System

_______________________________________________________

HVAC Temperature Door Inoperative (Figure 12-121)

Step

Action

Value(s)

Yes

No

1

With the ignition switch in the run position, oper-
ate temperature control dial and observe the
motor. Does door move?

Condition is inter-

mittent.

Go to step 2.

2

Remove the temperature blend door motor from
the side of the HVAC case. With the ignition
switch in the run position, operate the temperature
control dial and observe the motor. Is the motor
turning?

Mechanical prob-

lem in the HVAC

case.

Go to step 4.

3

Disconnect electrical connector from the temper-
ature blend door motor. Using a DVOM, set to
measure voltage, and using J–35616-92 test
adapters, probe the dark green wire (CKT 399)
with the positive lead and the black wire (CKT
58) with the negative lead. Turn the ignition
switch to the run position. Is voltage present?

+12v

Go to step 6.

Go to step 4.

4

With ignition on, using a DVOM, set to measure
voltage and using J–35616-92 test adapters probe
the dark green wire (CKT 399) with the positive
lead. Place the negative lead on a known good
ground. Is voltage present?

+12v

Go to step 5.

Repair open or

short to ground

between tempera-

ture blend door

motor and fuse 7C.

5

With the ignition off, and using a DVOM, set to
measure ohms, check for resistance between the
black wire (CKT 58) of the temperature blend
door, and a good ground. Does resistance exceed
specifications?

<.2

1

Locate open or bad

connection between

temperature blend

door motor and G4.

Go to step 6.

6

Using a DVOM, set to read volts, the ignition
switch on the run position, and using J–35616-92
test adapters, probe the light blue wire (CKT 402)
with the positive lead, and the black wire (CKT
58) with the negative lead. Rotate temperature
control dial on the HVAC control head from cold
to hot and back. Is voltage present at the cold set-
ting and 0v on the hot setting?

Cold = +12v

Hot = 0v

Cold = +12v

Replace the temper-

ature blend door

motor.

Go to step 7.

7

Disconnect the 8 wire connector at the HVAC
control head. Using a DVOM, set to measure
ohms, check resistance between the light blue
(CKT 402) of the 8 wire connector, and the light-
blue wire (CKT 402) of the temperature blend
door connector. Does resistance exceed specifica-
tions?

62K

1

Go to step 9.

Go to step 8.

8

Check for open or bad connection between the
HVAC control head 8 wire connection and the
temperature blend door motor connection. Check
for loose terminals at the control head. Was a bad
connection found?

Repair or replace
harness as neces-

sary.

Go to step 9.

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Electrical System 12-77

WINDSHIELD WIPER SYSTEM AND COMPONENTS

Windshield Wiper Motor Assembly Replacement

Removal

1.

Remove the headliner.

2.

Remove the center trim from the windshield assembly.

3.

Disconnect the windshield wiper motor assembly harness from the crossbody harness (Figure 12-56).

4.

Remove the three bolts, washers, and lock washers securing the windshield wiper motor assembly to the windshield assembly.

5.

Remove the retainer securing the windshield wiper linkage to the windshield wiper motor cranking pin and remove the wind-
shield wiper motor assembly.

Installation

1.

Lubricate the windshield wiper motor cranking pin and secure the windshield wiper linkage to the windshield wiper motor
cranking pin using the retainer (Figure 12-56).

2.

Secure the windshield wiper motor assembly to the windshield assembly with the three lock washers and bolts. Tighten the
bolts to 12 lb-ft (16 N•m).

3.

Connect the windshield wiper motor assembly harness to the crossbody harness.

4.

Secure the windshield center trim to windshield.

5.

Install the headliner.

9

Using a DVOM, set to measure voltage, probe the
dark green wire (CKT 399) of the 8 wire connec-
tor on the HVAC control head with the positive
lead, and the black wire (CKT 58) of the three
wire HVAC control head connector with the nega-
tive lead. With ignition on, is voltage present?

+12v

Replace faulty

HVAC control

head.

Go to step 10.

10

Using a DVOM, set to measure voltage, probe the
dark green wire (CKT 399) of the HVAC control
head eight wire connector with the positive lead.
Attach the negative lead to a known good ground.
With the ignition switch in the run position, is
voltage present?

+12v

Go to step 11.

Locate short or

open between the

HVAC control head

and fuse 7C.

11

Using a DVOM, set to measure ohms, check
resistance between the black wire (CKT 58) of
the HVAC control head connector and a good
ground. Does resistance exceed specifications?

<.2

1

Replace faulty
HVAC control

head.

Locate and repair

open or poor con-

nection in the

ground circuit

between CKT 58

and G4.

HVAC Temperature Door Inoperative (Cont’d) (Figure 12-121)

Step

Action

Value(s)

Yes

No

12-78

Electrical System

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Figure 12-56: Windshield Wiper Motor Assembly Replacement

Windshield Wiper Motor Inoperative All Speeds (Figure 12-158)

Step

Action

Value(s)

Yes

No

1

Gain access to the wiper motor connector under
the windshield trim. Using a DVOM, set to mea-
sure resistance, check resistance to ground on the
brown wire (CKT 59). Is the resistance below the
specified value?

<.2

1

Go to step 2.

Repair open or

bad connection

in CKT 59

between the

wiper motor and

G4.

2

Turn the ignition switch to the “RUN” position
and the wiper switch to “LOW”. Using a DVOM,
set to measure voltage, check for voltage at the
dark green wire (CKT 63). Is the specified volt-
age present?

+12v

Replace the

wiper motor.

Go to step 3.

3

Remove the wiper switch from the instrument
panel and turn the ignition to the “RUN” position.
Using a DVOM, set to measure voltage, back
probe the yellow wire (CKT 65) at the wiper
switch. Is the specified voltage present?

+12v

Replace the

wiper switch.

Repair the open

or bad connec-

tion in CKT 65

between the

wiper switch

and fuse 13G.

Windshield Wiper Motor Inoperative on LOW (Figure 12-158)

Step

Action

Value(s)

Yes

No

1

Remove the wiper switch from the instrument
panel. Turn the ignition to the “RUN” position
and the wiper switch to “LOW”. Using a DVOM,
back probe the dark green wire (CKT 63) at the
switch. Is the specified voltage present?

+12v

Go to step 3.

Go to step 2.

WINDSHIELD

LINKAGE

WINDSHIELD WIPER
MOTOR ASSEMBLY

ASSEMBLY

WINDSHIELD WIPER

WINDSHIELD WIPER

MOTOR CRANKING PIN

WINDSHIELD WIPER MOTOR

ASSEMBLY HARNESS

RETAINER

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Electrical System 12-79

2

Using a DVOM, set to measure voltage, back
probe the yellow wire (CKT 65) at the wiper
switch. Place the ground lead on a known good
ground. With the ignition on, is the specified volt-
age present?

+12v

Replace the

wiper switch.

Repair open or

bad connection

in CKT 65

between the

wiper switch

and fuse 13G.

3

Gain access to the wiper motor connector behind
the windshield trim. Using a DVOM, back probe
the dark green wire (CKT 63) at the wiper motor.
Turn the ignition switch to the “RUN” position,
and set the wiper switch to “LOW”. Is the speci-
fied voltage present?

+12v

Replace the

wiper motor.

Repair the open

or bad connec-

tion in CKT 63

between the

wiper motor and

the wiper

switch.

Windshield Wiper Motor Inoperative on High (Figure 12-158)

Step

Action

Value(s)

Yes No

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?

+12v

Go to step 3.

Go to step 2.

2

With the ignition switch in the RUN” position,
check the voltage at the yellow wire (CKT 65). Is
the specified voltage present?

+12v

Replace the

wiper switch.

Repair the open

or bad connec-

tion on CKT 65

between the

wiper switch

and fuse 13G.

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
voltage at the red wire (CKT 61). Is the specified
voltage present?

+12v

Replace the

wiper motor.

Repair the open

or bad connec-

tion on CKT 61

Between the

wiper motor and

the wiper

switch.

Windshield Wipers Intermittent Speeds Inoperative (Figure 12-158)

Step

Action

Value(s)

Yes

No

1

Do the windshield wipers work normally on the
low and high speeds?

Go to step 2.

Refer to the

diagnostic chart

for the specific

problem on the

standard wiper

diagnosis.

Windshield Wiper Motor Inoperative on LOW (Figure 12-158)

Step

Action

Value(s)

Yes

No