Interior Lamps Dimming: Notes

WARNING: This page is about a different car, the 2009 Saturn Vue. 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.

The PRNDL lamp
The door switches and window switches
The HVAC control head assembly
The outside rearview mirror switches
The driver information center (DIC)
The radio
The lamp switch assembly
The steering wheel controls
The instrument panel cluster (IPC)
The 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 dimmer switch. When the interior lamp switch is varied, the position of the switch is applied through the instrument panel (I/P) dimming control circuit to the BCM. The BCM then applies a voltage to the interior lamps.

The lamps become illuminated when the park lamps are ON. The brightness of all the incandescent lamps is determined by a variable voltage signal from the dimmer switch and sent through the instrument panel lamp supply voltage circuit. The lamps are located in various components, refer to Interior Lights Schematics .