Suzuki 2006 SX4, Service Manual

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3B-4 Differential:
4WD Control System Description
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4WD Shift Control
The 4WD control module operates the coupling assembly according to the 2WD/4WD switch operation to obtain 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 outputs 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.
Function of 4WD Control System Component
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Operation Condition
(when any one of the following conditions is satisfied) Indicator
4WD AUTO
indicator
OFF
• Ignition switch is OFF.
• Vehicle is at “2WD” position or “4WD-lock” position.
ON
• 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.
Blinking at intervals of 2
seconds continuously
• 4WD control module detects the rotation difference of front wheel and
rear wheel and/or temperature of transfer more than specified
temperature.
4WD LOCK
indicator
OFF
• Ignition switch is OFF.
• Vehicle is at “2WD” position or “4WD-auto” position.
ON
• 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.
Part Name Function
2WD/4WD switch Output ON and OFF signal of 2WD/4WD switch to 4WD control module.
4WD AUTO indicator Indicates vehicle is at 4WD-auto mode or not.
4WD LOCK indicator Indicates vehicle is at 4WD-lock mode or not.
4WD control module • Controlled of current to coupling assembly and vehicle switching to each position.
• Diagnosis 4WD control system components.
• Output operation signal of indicator to BCM.
Coupling assembly The driving force of corresponding to the signal from 4WD control module transmitted
to the rear wheel.