Battery positive voltage is supplied through the RR DEFOG fuse, in the underhood fuseblock, to the DEFOG
relay switched input. When you turn ON the ignition, ignition voltage is supplied through the SEO IGN fuse, in
the underhood fuseblock, to the DEFOG relay coil. When you depress the rear window defogger switch. The
HVAC control module illuminates the rear window defogger indicator and sends a class 2 message to the BCM
to enable the rear window defogger system. The BCM energizes the DEFOG relay by grounding 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. Ground for the rear window
defogger grid is provided by G301.
When you turn ON the ignition and press the rear window defogger switch, the defogger cycle lasts 10 minutes.
Further operation results in additional 10 minute defogger cycles.
STATIONARY WINDOW DESCRIPTION
Most stationary windows, specifically windshields, are retained to the body with urethane adhesive which
adheres the window to the body, increasing structural integrity. The reinstallation of the windows with urethane
adhesive requires complete replacement of the urethane adhesive bead, and is know as the Full Cut Method.
FULL-CUT METHOD DESCRIPTION
Use only the full cut method also know as in the field as Full Strip Method when installing windows.
This method includes the following:
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The replacement of a majority of the urethane adhesive bead remove all but approximately 2 mm (3/64
in) of the existing bead of urethane adhesive from the pinch-weld flange.
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Applying pinch-weld primer to any exposed painted areas on the pinch-weld flange.
No mounds or loose pieces of urethane adhesive should remain on the pinch-weld flange. Do not remove all
traces of urethane adhesive.
IMPORTANT:
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If corrosion of the pinch-weld flange is present, or if sheet metal repairs or
replacements are required, refinish the pinch-weld flange in order to
present a clean, primer-only surface.
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If paint repairs are required, mask the flange bonding area, prior to
applying the color coat, in order to provide a clean, primer-only surface.
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Appropriate materials for these primer applications are typically 2
component catalyzed products. Use materials such as BASF DE15(R),
DuPont 2610(R), Sherwin-Williams PSE 4600 and NP70(R) and Martin-
Semour 5120,5130(R), PPG DP90LF SPIES/ HECKER 3688/8590 -
3688/5150 - 4070/5090 STANDOX 11158/13320 - 14653/14980 products are
approved for this application. Follow the manufacturer's directions for the
mix, the application, and the drying times.
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After repairing the opening as indicated, shake the pinch-weld primer
black #3 well. Using a new dauber, apply the primer to the primed surface
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Stationary Windows - Hummer H2