Suzuki GRAND VITARA JB416, Service Manual

Page: 121 / 474

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