Differential Assembly: Description and Operation

This system frees or locks the rear differential according to the position of the rear diff. lock SW. The differential will lock only when the rear diff. lock detection SW is ON and the vehicle speed is at 8 km/h (5 mph) or less.
When the rear 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 or the lock side inside the rear diff. lock motor 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 rear diff. lock motor to TERMINAL 2 to TERMINAL 2 of the 4W0 control 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 RR DIFF LOCK indicator light in the combination meter.
When the rear 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 rear diff. lock motor 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 rear diff. lock motor to TERMINAL 3 to TERMINAL 3 of the 4WD control 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 defection SW and the RR DIFF LOCK indicator light in the combination meter are turned OFF.

The RR DIFF LOCK indicator light flashes when:
* The rear diff. lock SW is switched to ON position during differential lock prohibition conditions (Vehicle speed above 8 km/h (5 mph)).
* The rear diff. lock detection SW is turned OFF during operation of the rear diff. lock motor.