Suzuki Grand Vitara JB627. Service manual - part 150

3C-4 Transfer: 

Function of 4WD Control System Component

S6JB0B3301004

4WD Control System Operation

S6JB0B3301005

Instead of the transfer shift lever assembly, the transfer position (4H, 4H-lock, N and 4L-lock) is shifted automatically 
by operating the transfer switch.
The 4WD control module operates the transfer shift actuator according to the transfer switch operation.

Part Name

Function

4L/N switch

Detects transfer shift position combining center differential lock 
switch.

Center differential lock switch

Detects transfer shift position combining 4L/N switch.

Transfer switch

Shifts transfer shift position.

N indicator

Indicates transfer is at N position or not.

4L indicator

Indicates transfer is at 4L-lock position or not.

Differential lock indicator

Indicates transfer is at 4H-lock, 4L-lock or not.

Transmission range sensor (N position) (for A/T 
model)

Detects A/T is at N range or not.

CPP switch

Detects clutch pedal is depressed or not.

Buzzer incorporated into BCM

• Indicates transfer is at “N” position.
• Warns of prohibited shift operation.

4WD control module

• Controls transfer shifting.
• Diagnoses 4WD control system components.
• Output operation signal of indicators and buzzer to BCM.

Transfer shift actuator

• Consists of transfer shift actuator motor and transfer shift 

actuator motor position switch.

• Shifts transfer shift position operating High / Low shift fork and 

differential lock shift fork via cams.

• Detects transfer shift actuator motor position.

Diagnosis connector

Indicates DTC on indicators when grounding its diagnosis 
terminal.

Transfer: 3C-5

4H (4WD High) Position
The driving force from the transmission is transmitted to the transfer input gear. As the center LSD case and transfer 
input gear are engaged via the reduction shift sleeve at this time, the driving force transmitted from the transfer input 
gear to the rear output shaft rotates them at the same speed.
Also, driving force from the center LSD is transmitted to the front drive shaft through front drive sprocket. Then, the 
front drive sprocket rotates the front output shaft via the drive chain.

[A]

[B]

1

2

5

4

4

3

5

9

8

6

7

11

12

13

14

15

10

I5JB0A332003-02

[A]: Transfer position indicator 

4. Shift fork pin

9. Reduction shift sleeve

14. Drive chain

[B]: Transfer switch

5. Shift cam

10. Center LSD case

15. Front output shaft

1. 4L/N switch

6. High / Low shift fork

11. Front drive shaft

2. Center differential lock switch

7. Differential lock shift fork

12. Front drive sprocket

3. Transfer actuator

8. Input gear

13. Rear output shaft

3C-6 Transfer: 

4H-lock (4WD High Center Differential Lock) Position
When 4H-lock position is selected from 4H position by turning the transfer switch, the transfer shift control actuator 
motor runs and shift cam rotates in the arrow direction “A”. The shift cam shifts the differential lock shift fork in the 
arrow direction “B”, and the differential lock clutch sleeve also moves in the arrow direction “B”.
The driving force from the transmission is transmitted from the transfer input gear to the rear output shaft, as in the 
case of 4H position. Also, as the front drive shaft and front drive sprocket bush are engaged via differential lock clutch 
sleeve, the driving force from the input gear is locked and transmitted to the rear output shaft.

B

[A]

[B]

1

2

4

3

5

7

10

6

8

9

11

12

13

14

A

4

5

I5JB0A332004-03

[A]: Transfer position indicator

3. Transfer actuator

7. Input gear

11. Rear output shaft

[B]: Transfer switch

4. Shift fork pin

8. Differential lock clutch sleeve

12. Front drive shaft

1. 4L/N switch

5. Shift cam

9. Front drive sprocket bush

13. Drive chain

2. Center differential lock switch

6. Differential lock shift fork

10. Front drive sprocket

14. Front output shaft

Transfer: 3C-7

N (Neutral) Position
When N position is selected from 4H position by turning the transfer switch, the transfer shift control actuator motor 
runs and shift cam rotates in the arrow direction “A”. The shift cam shifts the High / Low shift fork in the arrow direction 
“B”, and the reduction shift sleeve moves in the arrow direction “B”. Also, the shift cam shifts the differential lock shift 
fork in the arrow direction “C”, and the differential lock clutch sleeve also moves in the arrow direction “C”.
The driving force from the transmission is transmitted to the transfer input gear. However, as the reduction shift sleeve 
is not engaged with the transfer input gear and low gear, the driving force is not transmitted to the rear output shaft and 
front output shaft.

A

C

B

[A]

[B]

1

2

5

4

4

3

5

9

8

6

7

11

12

13

10

I5JB0A332005-01

[A]: Transfer position indicator 

2. Center differential lock switch

5. Shift cam

8. Input gear

11. Rear output shaft

[B]: Transfer switch

3. Transfer actuator

6. High / Low shift fork

9. Reduction shift sleeve

12. Drive chain

1. 4L/N switch

4. Shift fork pin

7. Differential lock shift fork

10. Differential lock clutch sleeve

13. Front output shaft