Suzuki Grand Vitara JB416 / JB420. Manual - part 172

3C-2 Transfer: Motor-Shift Type (Transfer with Shift Actuator)

General Description

Transfer Description

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The aluminum transfer case directly connected to the back of the transmission contains input gear, counter gear, rear 
output shaft, front output shaft, center differential, drive chain and their accompanying gears, hubs, sleeves, fork, etc.
The center differential is installed in the transfer. With the torque induction type LSD used in the center differential, the 
effect of LSD works when a rotation difference between front and rear wheels is occurring.
The transfer has such a selective mechanism as to enable the shift actuator to make selection of high speed (direct 
connection with transmission output: main shaft), low speed (speed reduction by input gear, counter gear and low 
gear) or neutral by way of the reduction shift sleeve located between the input gear and low gear, and selection of 
center differential lock or not by way of the differential lock clutch sleeve located at the center of the rear output shaft.
The case has an oil pump to provide proper lubrication.

4WD Control System Description

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Transfer Shift Control
The 4WD control module controls the transfer shift actuator based on the signal from the transfer switch so that the 
transfer is shifted to the selected position (4H, 4H-lock, N or 4L-lock). (Shifting to the N position requires that the 
switch to “†” position (1) keep it there for about 10 seconds then turn it to “N” position.)
The transfer actuator consists of the actuator motor and the actuator motor position switch. The 4WD control module 
detects the position of the actuator motor using the position switch and controls the actuator motor running / stopping 
operation.
Also, the 4L/N switch and center differential lock switch that detect the each position of the High / Low shift fork and 
the differential lock shift fork are installed the transfer assembly. The 4WD control module detects the transfer actual 
shift position (4H, 4H-lock, N or 4L-lock) by the signals from the 4L/N switch and center differential lock switch as 
follows.

Relationship of transfer shift position and switches

When the transfer shift actuator motor position detected by motor position switch and transfer actual shift position 
detected by the above-mentioned switches match, the 4WD control module judges that the transfer shifting is 
complete.

Retry Control
When 4WD control module cannot judge the shifting to the target position, it commands to retry the shifting up to 3 
times. If retry shifting is not possible, previous shift position is restored and notify failure of the shifting with the 
indicator and buzzer.

Indicator And Buzzer Operation
The 4WD control module output operation signal of the differential lock indicator, 4L indicator, N indicator and the 
buzzer to BCM. Indicators and buzzer as follows in order to inform what state the transfer control system is.

Switch

Transfer shift position

4H

4H-lock

N

4L-lock

4L/N switch

OFF

OFF

ON

ON

Center differential lock switch

ON

OFF

ON

OFF

1

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Transfer: Motor-Shift Type (Transfer with Shift Actuator) 3C-3

Operation

Condition

Indicator

Buzzer

Differential 

lock 

indicator

OFF

—

• Ignition switch is OFF.
• Transfer is at 4H/N position.

ON

—

• Within 2 seconds after ignition switch is turn ON (checking 

indicator operation).

• Transfer is at 4H-lock/4L-lock position.

Flashes at 0.25 
seconds for 3 
times, at intervals 
of 20 seconds.

Sounds at 1 
second at 
intervals of 20 
seconds.

• The transfer shift position is different for transfer switch.

Flashes at 
intervals of 0.25 
seconds 
continuously

—

• 4WD control module detects DTC of 4WD control system.

Flashes at 
intervals of 0.5 
seconds 
continuously

—

• Transfer is shifting from 4H to 4H-lock.
• Transfer is shifting from 4H-lock to 4H.
• Transfer could not complete shifting to 4H-lock.

4L indicator

OFF

—

• Ignition switch is OFF.
• Transfer is at 4H-lock/N position.

ON

—

• Within 2 seconds after ignition switch is turn ON (checking 

indicator operation).

• Transfer is at 4L-lock position.

Flashes at 0.25 
seconds for 3 
times, at intervals 
of 20 seconds.

Sounds at 1 
second at 
intervals of 20 
seconds.

• The transfer shift position is different for transfer switch.

Flashes at 
intervals of 0.25 
seconds 
continuously

—

• 4WD control module detects DTC of 4WD control system.

Flashes at 
intervals of 0.5 
seconds 
continuously

—

• Transfer is shifting from 4H-lock to 4L-lock.
• Transfer is shifting from 4L-lock to 4H-lock.
• Transfer could not complete shifting to 4L-lock.

N indicator

OFF

—

• Ignition switch is OFF.
• Transfer is at 4H/4H-lock/4L-lock position.

ON

—

• Within 2 seconds after ignition switch is turn ON (checking 

indicator operation).

• Transfer is at N position.

Flashes at 0.25 
seconds for 3 
times, at intervals 
of 20 seconds.

Sounds at 1 
second at 
intervals of 20 
seconds.

• The transfer shift position is different for transfer switch.

Flashes at 
intervals of 0.2 
seconds 
continuously

—

• 4WD control module detects DTC of 4WD control system.

Flashes at 0.5 
seconds 
continuously

—

• Transfer could not complete shifting to N.

—

—

Sounds at 0.2 
seconds for 2 
times, at intervals 
of 3 seconds.

• Transfer is at N position.

3C-4 Transfer: Motor-Shift Type (Transfer with Shift Actuator)

Function of 4WD Control System Component

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4WD Control System Operation

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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.

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.

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: Motor-Shift Type (Transfer with Shift Actuator) 3C-5

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”.

[A]

[B]

1

2

5

4

4

3

5

9

8

6

7

11

12

13

14

15

10

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[A]: Transfer position indicator 

5. Shift cam

11. Front drive shaft

[B]: Transfer switch

6. High / Low shift fork

12. Front drive sprocket

1. 4L/N switch

7. Differential lock shift fork

13. Rear output shaft

2. Center differential lock switch

8. Input gear

14. Drive chain

3. Transfer actuator

9. Reduction shift sleeve

15. Front output shaft

4. Shift fork pin

10. Center LSD case