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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 822 (Lighting Systems) >> Description and Operation >> Interior Lighting Systems Description and Operation >> Interior Lamps >> Interior Lamps Dimming

Interior Lamps Dimming

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The second group includes lamps which may be dimmed. This group may use a combination of vacuum fluorescent (VF) illumination and incandescent lamps.

When the ignition switch is turned to the RUN position, the radio's vacuum fluorescent (VF) displays turn on at maximum brightness. When the park lamps are on, all incandescent back lighting turn on at the dimming level indicated by the I/P dimmer switch. At the same time all vacuum fluorescent (VF) displays dim to match the indicated dimming level. The panel dimmer switch potentiometer is an input to the BCM. When the driver selects a dimming setting by moving the I/P dimming switch potentiometer, all incandescent back lighting lamps are provided with a specific voltage. When the I/P dimmer switch is moved from MIN to MAX, all vacuum fluorescent (VF) displays, as well as all incandescent back lighting respond from minimum intensity to maximum brightness in response to the I/P dimmer switch.

The left and right door switch illumination is controlled, receives voltage and ground from the drivers door module (DDM) and the passenger class II module and has full control of its illumination . The BCM, DDM, PDM, and ratio communicate through class II serial data for the lamp illumination commands.

The I\P cluster illumination lamps receive voltage and are controlled by the instrument panel lamps dimming supply voltage circuit. Ground for the instrument panel lamps is at G203.

The various switches, HVAC control assembly, and the PRNDL lamps receive voltage and are controlled by the BCU on the instrument panel lamps dimming control circuit. Ground for the traction control switch , steering wheel controls, and the rear window/wiper switch is at G108. Ground for the remaining switches is at G203.

The indicators receive voltage from the BCM on the LED dimming circuit. Ground/control for the indicators is from the various modules. Voltage for the LED dimming supply circuit, instrument panel lamps dimming control circuit and the instrument panel lamps dimming supply circuit is from the TBC A fuse in the instrument panel fuse block directly through the BCM to these circuits. A short to ground on only the instrument panel lamps dimming control circuit will open the fuse. The modules controlling the above indicators are as follows:

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