Lock/Unlock Sequence

When the passenger power door lock switch is pressed the following events occur:
1. The Passenger Door Module (PDM) will directly sense actuation of the passenger door power lock switch.
2. The PDM will send a serial data link message to the Drivers Door Module (DDM) requesting that the doors be locked.
3. The DDM receives and forwards the lock request message to the Remote Function Actuator (RFA) via serial data link.
4. The RFA receives the request message and examines for the following lockout prevention criteria:
^ IGNITION SWITCH KEY PRESENT signal (CKT 80) from the Ignition Switch.
^ DRIVER DOOR OPEN message from DDM.
^ Last Door Closed Locking (LDCL) function active message from the IPC.
5. The RFA broadcasts a serial data link command message to lock all of the doors when:
^ Ignition key is out of the ignition switch and - If LDCL is inactive, as soon as the drivers door is closed. - If LDCL is active, as soon as all doors are closed for 5 seconds.
^ The driver's power door lock switch is held in the LOCK position for greater than three seconds (Lockout Override).
6. The DDM receives and retransmits the command message from the RFA to the PDM and Rear Door Module (RDM).
7. All three modules actuate their door lock motors, thus completing the locking sequence.