4Wd Control System Description; Function Of 4Wd Control System Component - Suzuki SX4 Service Manual

3B-3 Differential:

4WD Control System Description

4WD Shift Control
The 4WD control module operates the coupling assembly according to the 2WD/4WD switch operation to the selected
position (2WD, 4WD-auto or 4WD-lock). Also, the 4WD control system has 4WD AUTO indicator and 4WD LOCK
indicator in order to inform the 4WD control system condition.
Indicator Operation
The 4WD control module output operation signal of the 4WD AUTO indicator and the 4WD LOCK indicator. Indicators
as follows in order to inform what state the 4WD control system is.
Operation
Indicator
OFF
4WD AUTO
ON
indicator
Blinking at intervals of 2
seconds continuously
OFF
4WD LOCK
indicator
ON

Function of 4WD Control System Component

Part Name
2WD/4WD switch
4WD AUTO indicator
4WD LOCK indicator
4WD control module
Coupling assembly
• Ignition switch is OFF.
• Vehicle is at "2WD" position or "4WD-lock" position.
• Within 2 seconds after ignition switch is turn ON (checking indicator
operation).
• Vehicle is at "4WD-auto" position.
• 4WD control module detects DTC of 4WD control system.
• 4WD control module detects the rotation difference of front wheel and
rear wheel and/or temperature of transfer more than specified
temperature.
• Ignition switch is OFF.
• Vehicle is at "2WD" position or "4WD-auto" position.
• Within 2 seconds after ignition switch is turn ON (checking indicator
operation).
• Vehicle is at "4WD-lock" position.
• 4WD control module detects DTC of 4WD control system.
Output ON and OFF signal of 2WD/4WD switch to 4WD control module.
Indicates vehicle is at 4WD-auto position or not.
Indicates vehicle is at 4WD-lock position or not.
• Controlled of current to coupling assembly and vehicle switching to each position.
• Diagnosis 4WD control system components.
• Output operation signal of indicator to BCM.
The driving force of corresponding to the signal from 4WD control module transmitted
to the rear wheel.
Condition
Function
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