Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 550

10E-4 Keyless Start System: 

Parts and Functions

S6JB0AA501002

Parts

Function

Keyless start control module

• Activates each antenna
• Verifies ID code of remote controller
• Requests steering lock unit to release steering lock
• Requests BCM to lock or unlock doors
• Controls key indicator light in combination meter
• Transmits its ID code to ECM

Remote controller

• Receives request signal from each antenna
• Transmits ID code and request signal to keyless start control module
• Request keyless start control module to lock or unlock doors (keyless entry 

system function)

Request switch

• Requests keyless start control module to activate each antenna

Center antenna

• Transmits request signal to remote controller

Luggage room antenna

• Transmits request signal to remote controller

Driver side door antenna

• Transmits request signal to remote controller

Passenger side door antenna

• Transmits request signal to remote controller

Rear end door antenna

• Transmits request signal to remote controller

Steering lock unit

• Releases steering lock

Unlock button

• Transmits door unlock request signal (keyless entry system function)

Lock button

• Transmits door lock request signal (keyless entry system function)

BCM

• Controls each door lock actuator
• Controls warning buzzer
• Lights hazard warning light and interior (DOME) light (answer back)

Key indicator light

• Indicates operation state of keyless start system (indicates check result of 

remote controller ID code)

ECM

• Checks keyless start control module ID code
• Transmits its ID code to keyless start control module
• Starts engine

Keyless Start System:  10E-5

Keyless Engine Start Function

S6JB0AA501003

When the ignition knob switch (2) installed to the steering lock unit (1) is pushed, the keyless start control module (3) 
activates the center antenna (4) to send out the request signal in the vehicle compartment. When the remote controller 
(5) receives the request signal from the center antenna, it transmits the ID code to the keyless start control module. 
The keyless start control module compares the ID code sent by the remote controller with the ID code registered in the 
keyless start control module. When these ID codes match, the keyless start control module makes the key indicator 
light (7) in the combination meter (6) light in blue and unlocks the steering lock unit to enable the ignition knob switch 
to turn. When the ignition knob switch is turned to ON position in this state, ID codes of ECM and keyless start control 
module are compared through CAN communication (immobilizer function).
When they match, turning the ignition knob switch to start position will start the engine.

NOTE
When ignition knob switch is at ACC or ON position (engine not running) and any door has been kept 
open for a certain time, it may happen that engine fails to start. In such a case, turn ignition knob 
switch to OFF position once and then try to start engine again.

 

When the ID code from the remote controller and the ID code registered in the keyless start control module do not 
match or when the remote controller is outside the operation area of the remote controller and the ignition knob switch 
is pushed, the steering lock unit cannot be unlocked and so the ignition knob switch cannot be turned. Then, the 
keyless start control module makes the key indicator light in the combination meter light in red to warn the driver that it 
is not possible to turn the ignition knob switch. Also, when the ID code of ECM and that of the keyless start control 
module do not match, the engine cannot be started even if the ignition knob switch is turned to the start position. Then 
ECM makes the immobilizer indicator light in the combination meter flash to warn the driver that it is not possible to 
start the engine.

8

3

4

1

6

ii)

iii)

iii)

iii)

iii)

iv)

i)

v)

vi)

vii)

[A]: i) ~ vii)

6

2

7

5

I6JB01A50002-01

[A]: Signal flow

8. ECM

10E-6 Keyless Start System: 

Door Lock Function of Keyless Start System

S6JB0AA501004

When the request switch (1) incorporated in the outside handle of the driver side door, front passenger side door or 
rear end door is pushed, the keyless start control module (2) activates the center antenna (3) and luggage room 
antenna (4) 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.

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.

[A]: i) ~ vii)

9

2

vi)

v)

vii)

iv)

i)

ii)

iii)

iii)

iii)

ii)

iii)

iii)

iii)

3

5

8

6

1

4

7

viii)

iii)

iii)

iii)

iii)

4

4

[B]

[C]

[C]

I6JB0AA50003-01

[A]: Signal flow

[C]: 3door model

[B]: 5door model

Keyless Start System:  10E-7

Operation Area of Remote Controller

S6JB0AA501005

Shown below are the operation areas of the remote controller for the keyless engine start function and door lock 
function of the keyless start system.

However, even when the remote controller is within the operation area as shown above, there are cases where the 
keyless start system doesn’t work under certain conditions as described below. And when the keyless engine start 
function doesn’t work, the key indicator light in the combination meter may light up.
• Doors cannot be locked or unlocked using the door lock function of keyless start system when:

– The remote controller which has been registered in the keyless start control module and another un-registered 

one are both carried at the same time

– The remote controller is kept in some metallic container which disturb radio wave transmission/reception
– One of doors is open
– The ignition key is inserted in the ignition key cylinder

• The function of the keyless start system to prevent the remote controller from being closed in the vehicle 

compartment doesn’t work when:
– The remote controller is in the door pocket or in the glove box
– The remote controller is kept in some metallic container which disturb radio wave transmission/reception
– The remote controller is placed close to outside of the vehicle compartment (such as on the instrument panel 

beside the front window shield glass or in a corner of the luggage room)

• The ignition knob switch cannot be turned using the keyless engine start function fails to turn:

– The remote controller which has been registered in the keyless start control module and another un-registered 

one are both carried at the same time

– The remote controller is kept in some metallic container which disturbs radio wave transmission/reception
– The ignition knob switch has been pushed for 5 seconds or longer
– The remote controller is placed close to outside of the vehicle compartment (such as on the instrument panel 

beside the front window shield glass or in a corner of the luggage room)

[A]

[C]

[B]

1

2

5

6

3

3

4

7

7

1

2

2

1

I6JB0AA50004-01

[A]: Door lock function of keyless start system

3. Center antenna

[B]: Function of keyless start system to prevent remote controller from being closed in 

vehicle compartment

4. Luggage room antenna (5door model)

[C]: Keyless engine start function

5. Vehicle compartment including luggage room

1. About 80 cm (31.5 in, 2.6 ft)

6. Vehicle compartment excluding luggage room

2. Each door antenna

7. Luggage room antenna (3door model)