Position Sensor/Switch: Description and Operation

REAR DIFFERENTIAL LOCK

SYSTEM OUTLINE

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

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

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

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