Body Control Module

Is located behind the instrument panel above the left kick panel

Acts as the central gateway module for the CAN bus

The BCM receives an input from the ajar switches to wake the module.

The door unlocking/locking management strategy is carried out by the BCM which controls the effective status of the locks by means of the signals that arrive from the switches in the locks themselves: in this way, the locking command is only carried out if the doors are properly shut and the locks unlocked; conversely, the unlocking command is only carried out if the locks are locked.

The power lock switch (also known as the door inhibit switch) is hard wired to the BCM.

When the BCM receives an input from the power lock switch, it provides the appropriate hard wired control outputs to energize or de-energize the power lock relays soldered onto its printed circuit board. The relays control the flow of battery current and ground to each of the power lock motors to lock or unlock each of the doors.

The BCM also stores the power lock system customer programmable feature settings received from the circuitry of the IPC. The BCM uses these settings and internal programming along with hard wired and electronic message inputs to determine the proper outputs needed to produce each of the appropriate power lock system features.

The power lock system circuits are continually monitored and controlled by the BCM. When the BCM monitors a problem in any of the power lock system circuits or components, it stores a fault code or Diagnostic Trouble Code (DTC) in its memory circuit.

The movement of the key cylinder on the driver door handle is detected by a switch connected electrically to the BCM. If the vehicle is being manually locked or unlocked using a bladed key inserted into the key cylinder, the BCM acquires the variation of resistance level and actuates the lock/unlock motor accordingly.