Module (PDM) receives input for a lock request
from a door lock switch, RKE (through the
BCM), or a cylinder lock switch (only with
VTSS), they will turn the lock drivers on for
375 msec. If the request is present beyond 375
msec, the door nodes consider the door lock
signal stuck. Once a door lock or unlock signal
is stuck for longer than 10 seconds, the appro-
priate door module will set a trouble code and
the signal input is ignored until the stuck
condition disappears. The door lock switches
provide a variable amount of resistance
thereby dropping the voltage of the multi-
plexed (MUX) circuit and the PDM will re-
spond to that command. The DDM lock switch
is a digital input not analog.
3.8.3
DOOR LOCK INHIBIT
When the key is in the ignition (in any position)
and either front door is open, the door lock switches
LOCK functions are disabled. The UN-LOCK func-
tions are still functional. This protects against
locking the vehicle with the key still in the ignition.
The RKE key fob will still lock the doors as usual.
After the key is removed from the ignition or the
doors are closed, the power door locks will operate
normally.
3.8.4
REMOTE KEYLESS ENTRY
The RKE transmitter uses radio frequency sig-
nals to communicate with the SKREEM module.
The SKREEM is on the PCI bus. When the opera-
tor presses a button on the transmitter, it sends a
specific request to the SKREEM. In turn the
SKREEM sends the appropriate request over the
PCI Bus to the:
•
Driver Door Module (DDM) to control the driver
front door lock and unlock functions, the arming
and disarming of the Vehicle Theft Security
System (if equipped), and the activation of illu-
minated entry.
•
Integrated Power Module (IPM) to activate the
park lamps, the headlamps, and the horn for
horn chirp.
If requested, the DDM sends a request over the
PCI Bus to the:
•
Passenger Door Module (PDM) to control the
passenger front, rear driver, and rear passenger
door lock and unlock functions.
•
Power Liftgate Module (PLGM) to control the
liftgate lock and unlock functions.
After pressing the lock button on the RKE trans-
mitter, all of the door locks will lock, the illumi-
nated entry will turn off (providing all doors are
closed), and the vehicle theft security system (if
equipped) will arm. After pressing the unlock but-
ton, on the RKE transmitter, one time, the driver
door lock will unlock, the illuminated entry will
turn on the courtesy lamps, and the vehicle theft
security system (if equipped) will disarm. After
pressing the unlock button a second time, the
remaining door locks will unlock. The EVIC or the
DRBIII
t can reprogram this feature to unlock all of
the door locks with one press of the unlock button.
If the vehicle is equipped with the memory system,
the memory message will identify which transmit-
ter (1 or 2) sent the signal.
The SKREEM is capable of retaining up to 8
individual access codes (8 transmitters). If the
PRNDL is in any position except park, the
SKREEM will disable the RKE. The 4 button
transmitter uses 1-CR2032 battery. The minimum
battery life is approximately 5 years based on 20
transmissions a day at 84°F (25°C). Use the
DRBIII
t or the Miller Tool 9001 RF Detector to test
the RKE transmitter. Use the DRBIII
t or the
customer programming method to program the
RKE system. However, the SKREEM will only
allow RKE programming when the ignition is in
the on position, the PRNDL is in park position, and
the VTSS (if equipped) is disarmed.
3.8.4.1
PANIC FUNCTION
Pressing the panic button on the RKE transmit-
ter will cause the headlamp relay, the park lamp
relay, and the horn relay to pulsate, which in turn
will cause the exterior lamps to flash and the horn
to sound intermittently. It will also cause the
courtesy lamp relay to actuate, turning on the
courtesy lamps. Pressing the panic button again
stops the headlamps and the park lamps from
flashing and the horn from sounding. However, the
courtesy lamps will remain on until either the
BCM times out lamp operation or until the ignition
is turned on. The panic feature operates for three
minutes at a time, unless the operator cancels it, or
the ignition is turned on.
Actuating the headlamp, horn, park lamps, and
courtesy lamps with the DRBIII
t will verify if the
circuits and the Integrated Power Module are OK.
If the panic feature is still inoperable with all
transmitters, it will be necessary to replace the
SKREEM. If the function is inoperable with just
one transmitter, then replace only that transmit-
ter.
3.8.4.2
ROLLING CODE
The rolling code feature changes part of the
transmitter message each time that it is used. The
transmitter message and the receiver message
increment together. Under certain conditions with
a rolling code system (pressing a button on the
RKE transmitter over 255 times outside the re-
17
GENERAL INFORMATION