Suzuki GRAND VITARA Owner's Manual page 727

DTC Detecting Condition and Trouble Area
DTC detecting condition
Though transfer shift actuator motor position switch is "4H"
position, the ON signal is not input from the center differential
lock switch.
DTC Confirmation Procedure
1) Clear DTC using scan tool.
2) Select transfer switch to "4H" position and keep its position for 1 min.
3) Check DTC.
Troubleshooting
Step
1 Was "4WD control system check" performed?
2 Center differential lock switch circuit check
1) Disconnect center differential lock switch connector with
ignition switch OFF.
2) Check for proper connection to terminal of center
differential lock switch connector.
3) If connection is OK, measure voltage between "RED/
GRN" terminal of center differential lock switch
connector and vehicle body ground with ignition switch
ON.
Is it 10 – 14 V?
3 Center differential lock switch check
1) Check center differential lock switch referring to
"Transfer Assembly Inspection: Motor-Shift Type
(Transfer with Shift Actuator)".
Is switch in good condition?
4 Wire harness check
1) Disconnect connector from 4WD control module
connector "E91" with ignition switch OFF.
2) Check for proper connection to "E91-14" terminal of
4WD control module connector.
3) If OK, measure resistance between "RED/GRN" terminal
of center differential lock switch connector and "E91-14"
terminal of 4WD control module connector.
Ω
Is it 1 or less?
Transfer: Motor-Shift Type (Transfer with Shift Actuator) 3C-39
Action
Trouble area
• Center differential lock switch
• Center differential lock switch circuit
• 4WD control module
Yes
Go to Step 2.
Go to Step 3.
Substitute a known-
good 4WD control
module and recheck.
Substitute a known-
good 4WD control
module and recheck.
No
Go to "4WD Control
System Check: Motor-
Shift Type (Transfer with
Shift Actuator)".
Go to Step 4.
Replace center
differential lock switch.
"RED/GRN" wire is
open or high resistance.