Interior Lamps Dimming
The second group includes lamps which may be dimmed. This group may use a combination of light emitting diodes (LED), incandescent lamps and pulse width modulation (PWM) illumination.
- Door lock switch - driver
- Headlamp switch
- Hazard switch
- HVAC control head assembly
- Instrument cluster
- Ignition mode switch
- Outside rearview mirror switch
- Radio
- Steering wheel control switch - left
- Steering wheel control switch - right
- Sun roof switch
- Sun roof tilt switch
- Traction control switch
- Transmission shift lever position indicator
- Window switch - driver
- Window switch - passenger
- Window switch - left rear
- Window switch - right rear
With the headlamp switch in the PARK or HEAD position, the park lamp switch signal circuit provides an input to the body control module (BCM). The BCM responds by applying voltage to the park lamps as well as the backlight dimming control circuits illuminating all components with interior backlighting. All interior backlighting turns ON at the dimming level indicated by the instrument panel (I/P) dimmer switch. The instrument panel (I/P) dimmer switch is a momentary type switch and utilizes a resistor ladder to increase and decrease the brightness of the interior backlighting components. The I/P dimmer switch provides a voltage signal to the BCM that will increase as the brightness of the lights are increased and decrease as the brightness of the lights are decreased. The BCM provides a low reference signal and a B+ circuit to the I/P dimmer switch. When the I/P dimmer switch is held in the desired position, the dimmed voltage setting is applied from the I/P dimmer switch through the I/P dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies a pulse width modulated (PWM) voltage through the backlighting control circuits illuminating the interior backlighting to the requested level of brightness.