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 via SBI to the Driver's Door Module (DDM) requesting that the doors be locked.
The driver door module will receive a SBI message from the driver door window switch assembly when the driver door lock button is pressed.
3. The DDM receives and forwards the lock request message to the Remote Function Actuator (RFA) via the class 2 serial data link.
4. The RFA receives the request message and examines for the following lockout prevention criteria:
^ IGNITION SWITCH KEY PRESENT signal from the ignition switch
^ DRIVER DOOR OPEN message from the 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:
^ The ignition key is out of the ignition switch and If Last Door Closed Locking (LDCL) is inactive, as soon as the driver's 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 3 seconds (Lockout Override).
6. The DDM receives and transmits 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.