Circuit Description

The dimmer output controls the intensity of the back-lighting of the cluster, radio, I/P switch, HVAC control head, and the transmission range shifter assembly. When the BCM receives the input voltage from the dimmer potentiometer over circuit 230 it converts it to a corresponding resistance value, and then to an output dimming level on circuit 8.

The dim output pulse width modulated signal. Minimum dim pot input voltage corresponds to maximum output duty cycle. Maximum dim pot voltage corresponds to minimum output duty cycle.

The BCM also provides a Class II PWM dimming message which is used by the IP cluster to provide dimming level control of the odometer backlight.