Rear Differential Lock

System Outline

This system frees or locks the rear differential according to the position of the diff. lock SW. The differential will lock only when the transfer indicator SW (Rear diff.) is on and the vehicle speed is at 8 km/h (5 mph) or less.

When the diff. lock SW is switched from OFF position to ON position, current flows to TERMINAL 4 of the 4WD control ECU. If the limit SW on the lock side inside the diff. lock shift actuator assembly is on at this time, until the limit SW is turned off, current flows from the 4WD fuse to TERMINAL 5 of the 4WD control ECU to TERMINAL 3 to TERMINAL 3 of the diff. lock shift actuator to TERMINAL 2 to TERMINAL 2 of the 4WD control ECU to TERMINAL 7 to GROUND. This drives the diff. lock shift actuator and locks the rear differential. When the rear differential locks, the transfer indicator SW (Rear diff.) turns on, lighting up the rear diff. lock indicator light in the combination meter.

When the diff. lock SW is switched from ON position to OFF position, the current to TERMINAL 4 of the 4WD control ECU is cut off. If the limit SW on the free side inside the diff. lock shift actuator assembly is on, until the limit SW is turned off, current flows from the 4WD fuse to TERMINAL 5 of the 4WD control ECU to TERMINAL 2 to TERMINAL 2 of the diff. lock shift actuator assembly to TERMINAL 3 to TERMINAL 3 of the 4WD control ECU to TERMINAL 7 to GROUND. This drives the diff. lock shift actuator and frees the rear differential. When the rear differential is free, the transfer indicator SW (Rear diff.) and the rear diff. lock indicator light in the combination meter are turned off.

The rear diff. lock indicator light flashes when:
- The diff. lock SW is switched to ON position during differential lock prohibition conditions (Vehicle speed above 8 km/h (5 mph)).
- The transfer indicator SW (Rear diff.) is turned off during operation of the diff. lock shift actuator.