Envoy/Jimmy 2001 Instrument Dimmer

The instrument light dimmer switch doesn't dim anymore, the result
being the instrument panel and and dashboard lights look as bright as
Vegas at night. Needing know how to remove the switch from the
dashboard. It's looks like the dimming switch is behind the dashboard
and not one that you can carefully pry out.

Is there and easy fix to remove it, or does the dashboard need to be
taken out. If I need to remove the dash maybe I should buy some
shades instead

Any help appreciated.

Thanks
Dave

Interior Lamps Dimming

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

Automatic transmission controller indicator lamp switch
Automatic transmission preference switch
Front fog lamp switch
Headlamp leveling switch (Export)
HVAC control head assembly
Inflatable restraint IP module switch
Instrument panel cluster (IPC)
Radio and remote tape/CD player
Rear fog lamp switch (Export)
Rear wiper/washer and endgate/liftgate window release switch
Rear window defog switch
Steering wheel radio controls
Transfer case shift control switch
Overhead driver information display module

When the ignition switch is turned to the ON position, the radio and driver
information display module vacuum fluorescent (VF) displays turn on at
maximum brightness. When the park lamps are on, all incandescent
backlighting turn on at the dimming level indicated by the IP dimmer switch.
At the same time, all vacuum fluorescent (VF) displays are controlled by the
BCM to match the indicated IP dimmer switch dimming level. Battery positive
voltage is supplied from the PARK LP fuse in the underhood fuse block to the
headlamp and panel dimmer switch and to the ILLUM and STR WHL ILLUM fuses
located in the IP fuse block. The IP panel dimmer switch potentiometer
receives both its voltage and ground from the headlamp switch and is also an
input to the BCM. When the driver selects a dimming setting by moving the IP
dimming switch potentiometer, all incandescent backlighting lamps are
provided with a specific voltage. The incandescent backlighting lamps are
then grounded at G200, G203 and G206. When the IP dimmer switch is moved
from MIN to MAX, all vacuum fluorescent (VF) displays, as well as all
incandescent backlighting respond from minimum intensity to maximum
brightness in response to the IP dimmer switch.



Document ID# 527620
2001 GMC Truck Envoy - 4WD
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Instrument Panel (I/P) Dimmer Switch Replacement

Removal Procedure

Ensure that the headlamp switch is OFF and that the ignition switch is in
the LOCK position.
Remove the instrument panel accessory trim plate. Refer to Trim Plate
Replacement - Instrument Panel (I/P) Accessory .
Disconnect the electrical connector.
Remove the screws that retain the headlamp switch panel to the instrument
panel accessory trim plate.
Remove the headlamp switch panel from the instrument panel accessory trim
plate.

Installation Procedure

Install the headlamp switch panel to the instrument panel accessory trim
plate.

Notice
Use the correct fastener in the correct location. Replacement fasteners must
be the correct part number for that application. Fasteners requiring
replacement or fasteners requiring the use of thread locking compound or
sealant are identified in the service procedure. Do not use paints,
lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces
unless specified. These coatings affect fastener torque and joint clamping
force and may damage the fastener. Use the correct tightening sequence and
specifications when installing fasteners in order to avoid damage to parts
and systems.

Install the screws that retain the headlamp switch panel to the instrument
cluster bezel. Tighten
Tighten the screws to 1 N·m (9 lb in).
Connect the electrical connector.
Install the instrument panel accessory trim plate. Refer to Trim Plate
Replacement - Instrument Panel (I/P) Accessory .



"Dave" wrote in message

> The instrument light dimmer switch doesn't dim anymore, the result
> being the instrument panel and and dashboard lights look as bright as
> Vegas at night. Needing know how to remove the switch from the
> dashboard. It's looks like the dimming switch is behind the dashboard
> and not one that you can carefully pry out.
>
> Is there and easy fix to remove it, or does the dashboard need to be
> taken out. If I need to remove the dash maybe I should buy some
> shades instead
>
> Any help appreciated.
>
> Thanks
> Dave