Circuit/System Description
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
The BCM supplies a voltage reference through the I/P dimming voltage reference circuit to the interior lamp dimmer switch. When the dimmer switch is placed in a desired brightness position, reference voltage is applied through the dimmer switch rheostat and the I/P dimming signal circuit to the BCM. The BCM interprets this voltage signal, then applies a variable voltage through the instrument panel lamp supply voltage circuit, illuminating the components listed below:
- Instrument Panel Cluster (IPC)
- HVAC control module
- Radio
- Headlamp switch
- Driver window switch
- Driver door lock switch
- Front passenger window switch
- Front passenger door lock switch
- Outside rearview mirror switch
- Traction control switch
- PRNDL lamp (console shift)
- Driver Information Center (DIC)
- Steering wheel controls (RPO UK3)