Circuit Description
WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
The body control module (BCM) applies a 10 volt reference through the I/P dimming voltage reference circuit to the I/P dimming switch. When the switch is placed to the desired position, the dimmed voltage setting is applied from the I/P dimming switch through the I/P dimming signal circuit to the BCM. The BCM applies the dimmed voltage to the I/P lamps supply voltage circuit.