Circuit Description

The driver information center (DIC) switch is a multiplexed switch that functions as a DIC/Dimmer switch. The DIC switch is also used for the head-up display (HUD) if the vehicle is equipped with a HUD. The switch then functions as the HUD/DIC/Dimmer switch. The instrument panel cluster (IPC) only monitors the DIC switch inputs. The dimmer switch is monitored by the instrument panel module (IPM) and the HUD switch is monitored by the HUD module. The DIC switch is a momentary contact switch that connects a series of resistors. The IPC monitors the DIC switch signal circuit to determine the DIC switch inputs. Each switch state - INFO UP, INFO DOWN, INFO RESET, ENGLISH/METRIC, TRIP RESET - corresponds to a certain resistance value. The IPC determines the switch state by the voltage drop across the resistors. The IPC sets DTC B3567 when it detects a stuck DIC switch or when the DIC signal circuit is shorted to battery.