Suzuki Grand Vitara 2011 Manual page 1029

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 M or more?
Transfer: Motor-Shift Type (Transfer with Shift Actuator) 3C-44
Action 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
shorted to ground
circuit.