Principles of Operation Power Lock The power lock/unlock feature requests all of the vehicle doors, including the liftgate, be locked or unlocked upon a customer request from any interior door lock switch in the vehicle. The power door locking system functions independently of ignition status or vehicle speed. When the vehicle security module receives an unlock/lock command from any door lock control switch, the vehicle security module will activate relays internal to the module to supply the correct power and grounds for the door lock actuators.
Inspection and Verification
Verify the customer concern by operating the system.
Visually inspect for obvious signs of mechanical or electrical damage.
Visual Inspection Chart Mechanical Electrical
Binding latches
Central junction box (CJB) fuse(s):
5 (7.5A)
30 (30A)
Circuitry
Relays
Remote transmitter
Keyless entry keypad
Vehicle security module
If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
If the diagnostic tool does not power up, refer to the diagnostic tool manual.
Carry out the diagnostic tool >
SCP, UBP or ISO; all elctrconic control unitw, no response/not equipped, refer to Section 418-00 .
No response, not equipped for vehicle security module, refer to Section 419-10 .
System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the vehicle security module.
If the DTCs retrieved are related to the concern, go to the Vehicle Security Module Diagnostic Trouble Code (DTC) Index to continue diagnostics.
If DTCs are retrieved that are not found in the following Vehicle Security Module Diagnostic Trouble Code (DTC) Index, refer to the Master Vehicle Security Module Diagnostic Trouble Code (DTC) Index in Section 419-10 .
If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics..
Answers & Comments
Principles of Operation
Power Lock
The power lock/unlock feature requests all of the vehicle doors, including the liftgate, be locked or unlocked upon a customer request from any interior door lock switch in the vehicle. The power door locking system functions independently of ignition status or vehicle speed. When the vehicle security module receives an unlock/lock command from any door lock control switch, the vehicle security module will activate relays internal to the module to supply the correct power and grounds for the door lock actuators.
Inspection and Verification
Visual Inspection Chart Mechanical Electrical