roof lamps. The front clearance and roof lamps are grounded at G203. The rear clearance and roof lamps are
grounded at G410. If the headlamp switch is left in the ON position, the inadvertent power control feature will
turn off the park, tail, and clearance lamps, approximately 10 minutes after the ignition switch is turned to the
OFF position. If the driver places the headlamp switch in the ON position after the ignition switch has been
turned OFF, or if the ignition switch is in the ACCY position, the park, tail, and marker lamps, will remain on
until turned off or the battery runs dead.
Off-Road Lamps
The off-road lamps are available in several configurations with lights mounted on the roof and on the front
brush guard. The lamps are controlled by a single, rocker type switch, located on the overhead console. When
the switch is closed, voltage is supplied to the relays on the off-road lamps relay control circuit. When the relays
are energized, voltage is on the front, roof 1, and roof 2 off-road lamps supply voltage circuits, depending on
the configuration of lamps.
INTERIOR LIGHTING SYSTEMS DESCRIPTION AND OPERATION
Interior Lamps
The interior lighting consist of the following 2 groups. This first group includes lamps that may not be dimmed.
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The courtesy/Illuminated entry lamps
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The dome lamps
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The I/P compartment lamp
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The map lamps
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The reading lamps
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The vanity mirror lamps
Courtesy/Illuminated Entry Lamps
The courtesy/illuminated entry lamps, may be manually turned on or off by placing the interior lamp switch in
the ON or OFF position. If a door is opened, the courtesy/illuminated entry lamps illuminate. After all the doors
have been closed the courtesy/illuminated entry lamps will remain illuminated approximately 15 seconds. The
courtesy/illuminated entry lamps will also turn on prior to any door being opened, and remain illuminated
approximately 40 seconds when the driver removes the ignition key. If the interior lamp switch is turned on
when the ignition key is OFF, or the interior lamp switch is left on when the ignition key is turned OFF the
body control module (BCM) will turn off the courtesy lamps after approximately 10 minutes.
When the driver places the dome lamp defeat switch in the OFF position, the courtesy/illuminated entry lamps
will be disabled; however, the lamps will still operate from the interior lamp switch.
The left and right front door courtesy lamps are controlled, and receive voltage and ground from the drivers
door module (DDM) and the passenger door module (PDM), respectively. The BCM, DDM, and the PDM
communicate through class II serial data for the lamp illumination commands and the door ajar switches.
The remaining courtesy lamps are controlled and receive voltage from the BCM. Ground is provided to the
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2