Power Door Locks

The power lock system uses non-switched battery current received through a fused B(+) fuse so that the system remains operational regardless of the ignition switch position. BCM is the primary power lock system controller. 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 Electronic Vehicle Information Center (EVIC) circuitry of the Instrument Panel Cluster (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 micro-controller and software contained within 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 hard-wired circuits between components related to the power lock system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the power lock system or the electronic controls or communication between other modules and devices that provide some features of the power lock system. The most reliable, efficient, and accurate means to diagnose the power lock system or the electronic controls and communication related to power lock system operation, as well as the retrieval or erasure of a DTC requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

SLIDING DOOR SPECIFIC 

The sliding door power lock components are the latches, the switches and the contact boards for each door (if equipped with dual sliding doors). The contact board includes the connector plates and the ajar switch. To service the ajar/plate/contact board. Refer to BOARD, SWITCH CONTACT, REMOVAL .

The BCM houses and controls the relays specific to the power locking system.