Hummer H3. Manual — part 1732

Power Windows System Components

The power window system consists of the following components:

Driver window switch

Right front window switch

LR window switch

RR window switch

Window motors in each of the doors

PWR WDO 30A Circuit Breaker

Power Windows System Controls

The power windows system can be controlled by a power window up or down switch activation.

Driver Window Operation

When the ignition switch is in the RUN or ACCY position or retained accessory power (RAP) is
enabled and the window master switch is activated to the DOWN position, battery positive
voltage is applied to the window motor causing the window to open. When the window master
switch is activated to the UP position, battery positive voltage is applied to the window motor in
the opposite direction and the window closes.

The window master switch also controls the front passenger, LR and RR windows.

Express Down Feature

The driver window will travel to the fully down position when the window master switch is
pressed past the first detent. Activating the window master switch to the UP position will cancel
the express down feature.

Lockout Switch Feature

The window master switch has a lockout switch which disconnects the battery positive voltage to
the right front, LR and RR window switches, disabling them.

Individual Window Operation

When the ignition switch is in the RUN or ACCY position or retained accessory power (RAP) is
enabled and an individual window switch is activated to the DOWN position, battery positive
voltage is applied to the window motor causing that window to open. When the individual
window switch is activated to the UP position, battery positive voltage is applied to the window

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - H3

motor in the opposite direction causing that window to close.

REAR WINDOW DEFOGGER DESCRIPTION AND OPERATION

Rear Window Defogger System Components

The rear window defogger system consist of the following components:

Heating ventilation air conditioning control module

Body control module (BCM)

DEFOG relay

Rear window that has a number of grid lines

Rear Window Defogger Operation

When you turn the ignition to the ON position, ignition voltage is supplied to the rear defogger
relay coil. Battery positive voltage is supplied at all times to the rear defogger relay switched
input. When the rear window defogger switch is depressed. The body control module (BCM)
illuminates the rear window defogger indicator in the HVAC control module and sends a ground
signal to the BCM. The BCM energizes the rear defogger relay by supplying battery positive
voltage through the control circuit of the relay. This allows battery positive voltage from the relay
switched input through the switch contacts and out the relay switched output to the rear window
defogger grid.

When you turn ON the ignition and press the rear window defogger switch for the first time, the
defogger cycle lasts 10 minutes. Further operation results in 5 minute defogger cycles.

SPECIAL TOOLS AND EQUIPMENT

SPECIAL TOOLS

Special Tools

Illustration

Tool Number/Description

J-24402-A

Glass Sealant Cold Knife Remover

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - H3

J-34946

Window Pin Remover

J-39032

Stationary Glass Removal Tool

J-39040

Quarter Window Remover

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - H3

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - H3