Circuit/System Description
WARNING: This page is about a different car, the 2006 Buick Lucerne. However, it is still accessible from the selected car via links, so may be relevant.
Voltage for the interior backlighting components is supplied from the Panel Dimming Fuse in the rear electrical center to the body control module (BCM).
The BCM applies a voltage reference through the instrument panel (I/P) dimming voltage reference circuit to the interior lamp dimming switch, which is part of the headlamp switch. When the dimming switch is placed in the desired position, the dimmed voltage setting is applied from the interior lamp dimming switch through the I/P dimming return circuit to the BCM. The BCM then applies the dimmed voltage to the I/P lamps supply voltage circuit and they dim to the correct level.
The IP lamps are located in the following components:
- Cigar Lighter
- Door Lock Switches
- Headlamp Switch
- Hazard Switch
- I/P Cluster
- Lumbar Switches
- Power Window Switch
- Power Mirror Switches
- Power Seats Switches
- PRNDL
- Sunroof Switch
- Sunshade Switch
- TCS Switch
- Universal Garage Door Opener Switch