Differential Assembly: Description and Operation

This system frees or locks the rear differentials according to the position of the rear diff. look control SW. The differential will lock only when the rear diff. lock detection SW is ON and the vehicle speed is at 8 kph (5 mph) or less.

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

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

The diff. lock indicator light flashes when:
* The rear diff. lock control SW is switched to ON position during differential lock prohibition conditions (vehicle speed above 8 kph (5 mph)).

* The rear diff. lock detection SW is turned OFF during operation of the rear diff. lock motor.