Suzuki Grand Vitara JB416 / JB420. Manual - part 424

10E-1 Keyless Start System: 

Control Systems

Keyless Start System

Precautions

Precautions in Diagnosing Troubles

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• The keyless start system executes data transmission/reception by means of the radio wave. Therefore, proper 

operation may not be obtained if use of the door lock function and engine start function of the keyless start system 
is attempted near the place where strong radio wave is emitted (TV and radio broadcasting stations, etc.).

• Diagnostic information stored in keyless start control module memory can be checked only by key indicator lamp.
• Be sure to use the trouble diagnosis procedure as described in “Keyless Start System Check”. Failure to follow it 

may result in incorrect diagnosis. (Some other DTC may be stored by mistake in the memory of keyless start control 
module during inspection.)

• Be sure to read “Precautions for Electrical Circuit Service in Section 00” before inspection and observe what is 

written there.

• Communication of ECM, BCM, TCM (A/T model), 4WD control module (if equipped), ABS hydraulic unit / control 

module assembly (if equipped), keyless start control module and combination meter, is established by CAN 
(Controller Area Network). (For detail of CAN communication for keyless start control module, refer to “CAN 
Communication of Keyless Start System”). Therefore, handle CAN communication line with care referring to 
“Precaution for CAN Communication System in Section 00”.

• Replacement of the keyless start control module

When keyless start control module is replaced with new one, make sure that register remote controller ID code to 
Keyless start control module correctly according to “Registration Procedure for Remote Controller ID Code”.

• Keyless start control module substitution

When the keyless start control module used in another vehicle was installed in the vehicle, register the ID code of 
the remote controller in the keyless start control module as well as the ignition key transponder code for the 
immobilizer control system in ECM. For the registration procedure of the ignition key transponder code, refer to 
“Registration of the Ignition Key in Section 10C”.

Keyless Start System:  10E-2

General Description

Keyless Start System Description

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Keyless start system consisting of the parts shown below has three functions as described below.
• Keyless engine start function:

With the remote controller which has been registered in the keyless start control module carried with oneself, the 
engine can be started without using the ignition key.

• Door lock function:

Pushing the request switch incorporated in the outside handle of the driver side door, passenger side door or rear 
end door while carrying the remote controller which has been registered in the keyless start control module, doors 
can be locked or unlocked.

• Keyless entry system function:

It is possible to lock or unlock doors by pushing the lock or unlock button of remote controller.

The keyless start control module can accept registration of up to four remote controllers.

1

9

13

5

12

10

11

2

14

[A]

[B]

6

4

3

7, 8

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[A]: Driver side door outside handle

5. Luggage room antenna

11. Lock button

[B]: Passenger side or rear end door outside handle

6. Driver side door antenna

12. BCM

1. Keyless start control module

7. Passenger side door antenna

13. Key indicator lamp

2. Remote controller

8. Rear end door antenna

14. ECM

3. Request switch

9. Steering lock unit

4. Center antenna

10. Unlock button

10E-3 Keyless Start System: 

Parts and Functions

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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 lamp 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 lamp and interior (DOME) light (answer back)

Key indicator lamp

• 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-4

Keyless Engine Start Function

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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 
lamp (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.

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 lamp 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 lamp in the combination meter flash to warn the driver that it is not possible to start the 
engine.

8

3

1

6

ii)

iii)

iii)

iii)

iii)

iv)

i)

v)

vi)

vii)

[A]: i) ~ vii)

6

2

7

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[A]: Signal flow

8. ECM