against locking the vehicle with the keys 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.
3.13.4
AUTOMATIC DOOR LOCKS
This feature can be enabled or disabled by using
either the DRBIII
t or the customer programming
method. When enabled all the doors will lock when
the vehicle reaches a speed of 16 MPH (25.7 KMH)
and all the doors are closed. If a door is opened and
the vehicle slows to below 16 MPH (25.7 KMH), the
door locks will operate again once all doors are
closed and the speed is above 16 MPH (25.7 KMH).
3.13.5
REMOTE KEYLESS ENTRY (RKE)
The body control module interfaces with the RKE
module via a one-way serial bus interface. The RKE
module is not on the PCI bus. The RKE module
sends a 0-5 volt pulse width signal to the BCM
depending on which button on the transmitter was
pressed. The BCM controls the door lock/unlock
functions and the arming/disarming of the Vehicle
Theft Security System and the activation of illumi-
nated entry. The BCM also controls the decklid
solenoid. The Body Control Module activates the
park lamp, headlamps, and horn for horn chirp as
received from the RKE transmitter. Because the ZB
uses virtual locking, it knows when the vehicle is
locked or unlocked. If the RKE Unlock button is
pressed, and the vehicle is virtually locked, then the
park lamps will flash one time to indicate that only
the drivers outside door handle is active. If the park
lamps flash twice, then both outside door handles
are active. When a second press is initiated (within
5 seconds of the first) both passenger doors will
unlock and the park & tail lamps will flash twice.
The RKE module is capable of retaining up to 4
individual access codes (4 transmitters). The 4
button transmitters will have 2-CR2016 batteries
in series. The minimum battery life should be
approximately 4.7 years based on 20 transmissions
a day at 84°F (25°C). Using the DRBIII
t and
selecting RKE FOB Test can test the transmitter or
use the 9001 RF Detector. The RKE module can be
programmed via the DRBIII
t or the customer pro-
gramming method. The BCM will only allow pro-
gramming mode to be entered when the ignition is
in the on position, and the VTSS is in the disarmed
mode. The RKE module is located behind and left of
the instrument cluster.
3.14
POWER WINDOWS
The power window system includes the Body
Control Module (BCM), switches in the center con-
sole and the power window motors mounted to the
window regulator in each door. The BCM controls
logic for the driver and passenger door power win-
dows. The BCM receives a muxed hard wired input
from each window switch. The programming in the
BCM allows it to process the information from this
input. The BCM uses the information and hard
wired inputs from the door ajar switches to control
the courtesy lamps, and to control the operation of
the power window after ignition-off feature.
The window lift motors are of the permanent
magnet type with a hall effect sensor used for motor
movement. The power window system function op-
erates when the ignition switch is in the accessory
or On position. However, a unique feature of this
system will allow the power windows to be operated
for up to 2 minutes after the ignition switch is
turned to the Off position, or until a door is opened,
whichever occurs first (Accessory Delay). An auto-
down feature allows either window to be lowered all
the way, even if the window switch is released. Each
window has a switch that must be depressed in the
down direction to a second detent to begin an
auto-down event. Depressing the switch again in
any direction will immediately stop the window.
When the Windows are being driven in the auto
down mode, the BCM knows when to stop because it
monitors the hall effect output from the motor. As
the motor turns, it has a hall effect sensor that
changes state every half revolution (1 mm of win-
dow travel/revolution). When the BCM stops receiv-
ing hall pulses (no pulses in 100 ms), it stops the
window from going down.
Another feature is Smart Glass. The window
glass on the ZB/SRT-10 is designed to slide up into
a seal to prevent the windows from “popping” out at
high speeds. To prevent the glass from hanging up
on the seal, the BCM drops the glass when the door
is opened and returns it when the door is closed.
The BCM knows the position of the window by
counting the number of pulses as the window motor
is turning. When the correct number of pulses have
been received, then the window is stopped. After the
door is closed, then the BCM will drive the window
up into seal until no pulses are received in 100 ms.
3.14.1
DRIVER WINDOW
The Driver window motor is controlled directly by
the BCM without using any relays. Each pole of the
motor is controlled by a high side and a low side
driver (H-Bridge) inside of the BCM.
3.14.2
PASSENGER WINDOW
There are two relays controlling the Up & Down
function of the passenger power window. These
relays are located in the I.P. harness just above the
steering column. The BCM controls the window Up
21
GENERAL INFORMATION