C1237

DTC C1237: Center Differential Lock Switch Circuit Open

Wiring Diagram










DTC Detecting Condition and Trouble Area






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

1.
Was "4WD control system check" performed?
YES -
Go to Step 2.
NO -
Go to 4WD Control System Check 4WD Control System Check:Motor-Shift Type (Transfer with Shift Actuator).

2. Center differential lock switch circuit check

Disconnect center differential lock switch connector with ignition switch OFF.
Check for proper connection to terminal of center differential lock switch connector.
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?
YES -
Go to Step 3.
NO -
Go to Step 4.

3. Center differential lock switch check

Check center differential lock switch referring to Inspection Transfer Assembly Inspection:Motor-Shift Type (Transfer with Shift Actuator).

Is switch in good condition?
YES -
Substitute a known-good 4WD control module and recheck.
NO -
Replace center differential lock switch.

4. Wire harness check

Disconnect connector from 4WD control module connector "E91" with ignition switch OFF.
Check for proper connection to "E91-14" terminal of 4WD control module connector.
If OK, measure resistance between "RED/GRN" terminal of center differential lock switch connector and "E91-14" terminal of 4WD control module connector.

Is it 1 ohms or less?
YES -
Substitute a known-good 4WD control module and recheck.
NO -
"RED/GRN" wire is open or high resistance.