1) Connect the scan tool.
2) Turn OFF the ignition switch for 30 seconds or more.
3) Turn ON the ignition switch.
4) Observe the DTC information with a scan tool. Is a DTC set?
Yes
=>Go to Differential lock coil low-side control circuit inspection.
No
Go to Intermittent conditions of rear differential lock control system.
Refer to "204.Driveline, Axle 17D.Symptom intermittent conditions of differential lock control system".
1) Turn OFF the ignition switch.
2) Disconnect the rear differential lock control unit harness connector (C57) and differential lock coil harness connector (R39).
3) Inspect the wire harnesses and connectors for the following. Is the result normal?
Wire harness to be inspected
Refer to "LHD Differential Lock" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Differential Lock" in the ETM (wiring diagram). (Open using the ETM viewer.).
Inspection items
Yes
=>Go to Rear differential lock control unit replacement.
No
Repair the circuit as necessary.
Note
Refer to "3.Driveline, Axle 3Z.Driveline, Axle Electrical Control rear differential lock control unit removal".
Refer to "3.Driveline, Axle 3Z.Driveline, Axle Electrical Control rear differential lock control unit installation".
Refer to "3.Driveline, Axle 3Z.Driveline, Axle Electrical Control rear differential lock control unit setting".
Procedure completion
1) Clear the DTC with a scan tool.
2) Turn OFF the ignition switch for 30 seconds or more.
3) Turn ON the ignition switch.
4) Observe the DTC information with a scan tool.