Door Lock Motor - Operation

OPERATION

The power lock motors are controlled by outputs received from the ElectroMechanical Instrument Cluster (also known as the Cab Compartment Node/CCN). The EMIC acts upon programming, hard wired inputs from the driver or passenger door lock switches as well as electronic lock or unlock command message inputs received over the Controller Area Network (CAN) data bus from the Wireless Ignition Node (WIN) (also known as the Wireless Control Module/WCM) based upon inputs from the Remote Keyless Entry (RKE) transmitters. On vehicles so equipped, the EMIC also acts upon CAN bus inputs from the Passive Entry Module (PEM).

A positive and negative battery connection to the two lock motor terminals will cause the motor to move in one direction, locking or unlocking the latch. Reversing the current will cause the motor to move in the opposite direction.

The power lock motors and the hard wired circuits between the motors and the EMIC may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. 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 motors or the electronic controls and communication related to power lock motor operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.