Dtc C1237: Center Differential Lock Switch Circuit Open - Suzuki GRAND VITARA Owner's Manual

3C-38 Transfer: Motor-Shift Type (Transfer with Shift Actuator)
Step
2 Transfer shift actuator circuit check
1) Disconnect transfer shift actuator connector "C54" with
ignition switch OFF.
2) Check for proper connection to "C54-1" and "C54-4"
terminals of transfer shift actuator connector.
3) If connection is OK, measure voltage between "C54-1"
or "C54-4" terminal of transfer shift actuator connector
and vehicle body ground.
Is it 10 – 14 V?
3 Transfer shift actuator check
1) Check transfer shift actuator referring to "Transfer
Assembly Inspection: Motor-Shift Type (Transfer with
Shift Actuator)".
Is actuator in good condition?
4 Wire harness check
1) Disconnect connector from 4WD control module
connector "E91" with ignition switch OFF.
2) Check for open and high resistance or shorted to ground
in related circuits.
• Between "C54-1" terminal of transfer shift actuator
connector and "E91-22" terminal of 4WD control
module connector
• Between "C54-4" terminal of transfer shift actuator
connector and "E91-3" terminal of 4WD control
module connector
Are they in good condition?

DTC C1237: Center Differential Lock Switch Circuit Open

Wiring Diagram
[A]: 4WD control module connector "E91" (viewed from harness side)
1. 4WD control module
2. TCM
Action
1
12V
PNK/WHT
E91-13
E91-14 RED/GRN
[A]
11 10 9 8
12 7
26 23 22 21 20
25 24
Yes
Go to Step 3.
Substitute a known-
good 4WD control
module and recheck.
Substitute a known-
good 4WD control
module and recheck.
2
IG
3
4
3
6 5 4 2 1
19 13
18 17 16 15 14
I5JB0A332018-01
3. 4L/N switch
4. Center differential lock switch
No
Go to Step 4.
Replace transfer shift
actuator.
Repair circuit.
S5JB0A3314048