Hazard Warning Lamps

The hazard warning system includes the IPC, the BCM and the hazard switch in the Integrated Center Stack (ICS) module located in the center stack area of the instrument panel. The hazard switch provides a hardwired input to the BCM. When the BCM receives an input from the hazard switch, it controls hazard warning system operation and flash rate by controlling battery voltage outputs through high side drivers on the front and rear, right and left turn signal control circuits.

The BCM also sends the appropriate electronic hazard switch status  messages to the IPC over the CAN data bus to control the illumination and flash rate of the right and left turn signal indicators, as well as to control the click rate of an electromechanical relay soldered to the IPC electronic circuit board that emulates the sound emitted by a conventional electromechanical hazard warning flasher.