shorted wiring in doors or shorted door lock actuator in door. A grounding of a wire makes them lock normally. SO, any bare wire touching metal will ground it and lock the doors.
Principles of Operations
The Door Switch Lock Function
When a door lock switch is moved into the lock position or a door lock cylinder is rotated to the lock position, the door lock switch grounds the lock circuit input to the central security module (CSM). The CSM then provides 12 volts to one side of the door lock actuators contained in the door latch unit and simultaneously grounds the other side of the door lock actuators. This completes the door lock actuator circuit, causing the door lock actuators to rotate a cam assembly, which then locks the doors. The 12 volts that the CSM provides to the door lock actuators are provided to both door lock actuators from a single pin on the CSM electrical connector.
The Door Switch Unlock Function
When a door lock switch is moved into the unlock position, the door lock switch grounds the unlock circuit input to the CSM. The CSM then provides 12 volts to the opposite side (relative to locking the door) of the door lock actuator(s) contained in the door latch unit and simultaneously grounds the other side of the door lock actuator(s). This completes the door lock actuator circuit, causing the door lock actuator(s) to rotate a cam assembly in the opposite direction, which the unlocks the door(s). The 12 volts which the CSM provides to the door lock actuator(s) are provided to each door lock actuator from the individual pins on the CSM electrical connector.
The CSM has a self-test which can be entered into by using a diagnostic tool. This self-test will monitor the following CSM door lock inputs:
- Unlock switch (DTC B1311)
- Lock switch (DTC B1300)
- Exterior lock switch (DTC B1309)
- Exterior unlock switch (DTC B1341)
Before running the self-test, the following conditions must be met:
- The ignition switch must be in position II
- The driver and passenger doors must be unlocked
- The driver and passenger doors must be opened
- The hood and liftgate must be closed
- The set/reset switch, and liftgate release switch are not actuated
It is important to note that all of the diagnostic trouble codes (DTCs), with the exception of B1551 and B1553 can be retrieved with the self-test. DTCs B1551, and B1553 are continuous and will only be retrieved if the liftgate release is operated prior to retrieving the continuous DTCs.
Inspection and Verification
NOTE: Make sure that the battery is fully charged before starting electrical diagnosis.
NOTE: Prior to carrying out the CSM Self-Test, make sure that both the driver and passenger doors are open.
Verify the customer concern.
- Visually inspect for obvious signs of mechanical and electrical damage.
Visual Inspection Chart
- Binding latch mechanisms
- Binding linkage
- Misaligned door
Module Controlled Functions
- Central junction box (CJB) fuse(s)
- Wiring harness
- Electrical connector(s)
- Door lock switch(es)
- Door lock actuator(s)
The central security module (CSM) covers the following functions:
- Central door locking
- Double door locking
- Anti - theft alarm incorporating
- Radio frequency remote control of
- central door locking
- panic alarm
- driver door unlock
- liftgate unlock
For additional information, refer to Section 419-01A Anti - Theft - Active, Section 501-14A Handles, Locks, Latches and Mechanisms, and Section 501-14B Keyless Entry/Computer Operated Locks.
The CSM is in the passenger side kick panel I think.