Suzuki Grand Vitara JB627. Manual - part 429

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 light.
• 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 or ESP

® control module, 

keyless start control module, steering angle sensor (if equipped) and combination meter is established by CAN 
(Controller Area Network). (For detail of CAN communication for keyless start control module, refer to “CAN 
Communication System Description”). 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 being serviced, register 
the ID code of the remote controller to the keyless start control module first and then the following code.
– With immobilizer control system, register the ignition key transponder code for the immobilizer control system in 

ECM. For registration procedure of that, refer to “Registration of the Ignition Key in Section 10C”.

– Without immobilizer control system, register the steering lock unit ID code in keyless start control module. For 

registration procedure of that, refer to “Keyless Start Registration”.

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

11

10

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 light

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 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-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 
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

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[A]: Signal flow

8. ECM