Hummer H1 (2006+). Manual — part 352

12-84

Electrical System

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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

1

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 the brown wire (CKT 580) and the black
wire (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 connection

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 the black wire (CKT 59)
and the purple wire (CKT 739). Is the specified volt-
age present?

+12v

Go to step 5.

Repair the open

or bad connection

in CKT 739

between fuse 2C

and R-2.

5

With a DVOM,, check the resistance between the
purple wire (CKT 739) at the relay and the purple
wire (CKT 739) at the windshield. Does the resis-
tance meet the specified value?

<.2

1

Replace relay

R-2.

Repair the open

or bad connection

in CKT 739

between the left

side heated wind-

shield and R-2.

Both Heated Windshields Inoperative (Figure 12-157)

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

1

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
voltage present?

+12v

Repair the open

or bad connection

in CKT 580
between the

heated wind-

shield switch and

the relays.

Go to step 3.

Right Heated Windshield Inoperative (Figure 12-157)

Step

Action

Value(s)

Yes

No

______________________________________________________

Electrical System 12-85

3

Using a DVOM,, measure the resistance to ground
on the black wire (CKT 59) at the heated windshield
switch. Does the resistance meet the specification?

<.2

1

Go to step 4.

Repair the open

or bad connection

in CKT 59

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.

Both Heated Windshields Inoperative (Figure 12-157)

Step

Action

Value(s)

Yes

No

12-86

Electrical System

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POWER WINDOW SYSTEM

System Description

The power window system is the same for all models except model 89 which does not have the rear windows. All models with power
windows have the following components: a driver side window motor and switch, driver side controls for all windows including the win-
dow lock out switch (Figure 12-59), a front side window motor and switch, a circuit breaker, the power window relay and an express
down window module. All models except the model 89 have a set of rear window motors and switches.

Figure 12-59: Power Window Switches

Window Lock Out Switch

The window lock out switch allows the driver to over ride the passengers window controls (Figure 12-60). When activated the win-
dow lock out switch will open the circuit for the passenger activated window controls, thereby giving the driver complete control
of the window switches.

Figure 12-60: Power Window Lock Out Switch

Express Down Window Module

This module provides automatic full-open of a front power window from a single actuation of the window switch. Once the power
window down switch has been activated for 300ms, the module enters auto mode and the switch can be released. The window will
continue moving downward until one of the following conditions occurs:

1.

The power window “DOWN” switch is activated.

2.

The power window “UP” switch is activated.

3.

The module senses that the power window motor is stalled.

4.

The module has been in auto mode for 8 seconds.

DOOR SWITCH

L. REAR

R. FRONT

R. REAR

L. FRONT

SWITCH

LOCKOUT

POWER

WINDOW

LOCK OUT

SWITCH

POWER

WINDOW

LOCK OUT

CONNECTOR

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Electrical System 12-87

Drivers Window Inoperative

Step

Action

Value(s)

Yes

No

1.

Do all the other windows operate as designed?

–––

Go to step 2.

Refer to proper chart.

2.

Remove the drivers window switch and harness from
the bezel. With a DVOM, check the resistance to
ground on one black wire (CKT 56) and the other
black wire (CKT 56) at the switch. Does the resis-
tance on each wire meet the specifications?

<.2

1

Go to step 3.

Repair the open or bad con-
nection in CKT 56 between

the power window switch and

G4.

3.

Turn the ignition switch to the”Run” position and
check the voltage on the red wire (CKT 171). Is the
specified voltage present?

+12v

Go to step 4.

Repair the open or bad con-

nection on CKT 171 between

the window switch and relay

R4.

4.

Connect the window switch to the harness. With the igni-
tion in the “Run” position, back probe the purple wire
(CKT 222) and the yellow wire (CKT 226) with a
DVOM, set to measure voltage. Operate the window
switch and observe the voltage polarity. The voltage
should switch from +12v to -12v with the operation of the
switch. Does the polarity switch?

+12v to -12v

Go to step 5.

Replace the drivers door

power window switch.

5.

Gain access to the express down window module. With
the power window switch in the down position, check
for voltage at the yellow wire (CKT 226). Is the speci-
fied voltage present?

+12v

Go to step 6.

Repair the open or bad connec-

tion on CKT 226 between the
express down module and the

window switch.

6.

With the power window switch in the down position,
check for voltage at the white wire (CKT 228) of the
express down module. Is the specified voltage
present?

+12v

Go to step 7.

Replace the express down

module.

7.

Gain access to the window motor. Disconnect the har-
ness and with a DVOM, check the wires for polarity
change when the power window switch is operated.
Does the polarity change?

+12v to -12v

Replace the

power window

motor.

Repair the open or bad con-

nection on CKTs 226 and 227

between the window switch

and the window motor.

Express Down Feature Inoperative (Figure 12-109)

Step

Action

Value(s)

Yes

No

1

Does the drivers window function correctly other
than the express down feature?

__

Go to step 2.

Refer to proper chart.

2

Gain access to the express down module. with the
ignition in the “RUN” position, check the red wire
(CKT 171) for voltage. Is the specified voltage
present?

+12v

Replace the

express down

module.

Repair the open or bad con-

nection on CKT 171

between the express down

module and relay R4.