Interior Lamps Dimming: Notes
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 second group of lamps include lamps which may be dimmed. This group uses a combination of class 2 dimming and incandescent lamps:
- PRNDL lamp
- Head-up display (HUD) switch
- Door switches and window switches
- HVAC control head assembly
- Outside rear view mirror switches
- Driver information center (DIC)
- Radio
- Steering wheel controls
- The instrument panel cluster (IPC)
- Traction control switch
When the headlamp switch is placed in the PARK position, ground is supplied through the headlamp switch to body control module (BCM). The BCM also applies a voltage reference and a low reference signal to the interior lamp switch. When the interior lamp switch is varied, the position of the switch is applied through the I/P dimming control circuit to the BCM. The BCM then applies a voltage to the interior lamps.