Door Lock Function Of Keyless Start System - Suzuki SX4 Service Manual

10E-5 Keyless Start System:

Door Lock Function of Keyless Start System

When the request switch (1) incorporated in the outside handle of the driver side door, front passenger side door or
rear end door (Hatchback) is pushed, the keyless start control module (2) activates the center antenna (3) and
luggage room antenna (4) (Hatchback) or trunk room antenna (10) (Sedan) to send out the radio wave in the vehicle
compartment to check if the remote controller (5) is in the vehicle compartment or not. When the keyless start control
module receives no signal from the remote controller (i.e., the remote controller does not exist in the vehicle
compartment), it activates the antenna (6) of the door of which the request switch has been pushed to send the
request signal out of the compartment.
If the remote controller exists within the door lock operation area, it receives the request signal sent from the above
said antenna, sends the ID code of the remote controller and the request signal to the keyless start control module and
at the same time, it makes the operation indicator light (7) of the remote controller light up. Lighting of the operation
indicator light indicates that the remote controller sent the ID code and the request signal.
The keyless start control module compares the ID code sent from the remote controller with the ID code registered in
the keyless start control module. If both ID codes match, the keyless start control module outputs the lock or unlock
request signal (depending on the door lock switch (8) state then) to BCM (9). When BCM receives such signal through
CAN communication from the keyless start control module, it activates the door lock actuator to lock or unlock doors.
When the keyless start control module receives a signal from the remote controller (i.e., the remote controller exists in
the vehicle compartment), the function of the keyless start system to prevent the remote controller from being closed in
the vehicle works and the keyless start control module sends a request signal to unlock doors to BCM. In this way,
doors are kept unlocked.
Also, when the driver or passenger has left the vehicle with the remote controller left behind in the vehicle
compartment and locked doors by using the door lock knob or manual door lock switch, the function to prevent the
remote controller from being closed in the vehicle works to unlock doors.
[A]: i) ~ viii)
Furthermore, when ID codes of the remote controller and keyless start control module do not match or the remote
controller exists outside of the operation area, doors are not locked or unlocked even if the request switch of the
outside handle is operated.
2
iii)
vii)
iv)
iii)
i)
vi)
9
viii)
v)
5
7
[A]: Signal flow
ii)
ii)
iii)
10
3
iii)
1
6
8
S7RW0AA501004
iii)
4
iii)
iii)
iii)
I6RW0BA50002-01