DESCRIPTION
The differential system directly connects the rear left and right wheels so that even if one wheel slips while driving where drive torque transmission is difficult (such as on sand), the drive torque of the other wheel is ensured and traction is provided in emergencies.
When the transfer is in L4 and the differential lock switch is operated, the 4 wheel drive control ECU supplies power to the solenoid to switch the rear differential from free to locked, and cuts power to switch the rear differential from locked to free.
INDICATOR LIGHT AND BUZZER OPERATING CONDITIONS
| Mode | 2WD/4WD Mode Status | Rear Differential Lock Indicator Light | 4WD Indicator Light (Green) and 4LO Indicator Light | Buzzer |
|---|---|---|---|---|
| Rear differential free | H2 or H4 | Not illuminated | Turned off or illuminated to display H2 or H4 mode status | Not sounding |
| Rear differential free | L4 | Not illuminated | Illuminated | Not sounding |
| Rear differential switching between free and locked | L4 | Blinking | Illuminated | Not sounding |
| Rear differential locked | L4 | Illuminated | Illuminated | Not sounding |
| Rear differential lock malfunction | H2, H4 or L4 | Rapidly blinking | Illuminated | Not sounding |
Blinking: Blinks at 0.5 second intervals (0.5 seconds on and 0.5 seconds off)
Rapidly blinking: Blinks at 0.25 second intervals (0.25 seconds on and 0.25 seconds off)
FUNCTION OF COMPONENTS
| Components | Functions | |
|---|---|---|
| Differential lock coil | Switches the rear differential between free and locked according to commands from the 4 wheel drive control ECU. | |
| Rear differential lock position switch (No. 1 transfer indicator switch) | Detects the rear differential locked condition and sends that information to the 4 wheel drive control ECU. | |
| Combination meter assembly |
|
Illuminates to inform the user of the locked condition. Blinks to inform the user of switching between free and locked. Rapidly blinks to inform the user of a system malfunction. When the differential lock switch is pressed while not in L4, the indicator light blinks 3 times and the buzzer sounds 3 times. Tech Tips When the rear differential is in the locked condition, ABS, VSC and TRC are prohibited. |
| Differential lock switch | Selects free or locked for the rear differential. | |
| Skid control ECU (brake actuator assembly) | Outputs wheel speed signals to the 4 wheel drive control ECU via CAN communication. | |
| 4 wheel drive control ECU | Detects the vehicle status according to signals such as the wheel and vehicle speed signals received via CAN communication, and operates or stops the differential lock coil and switches the rear differential between locked and free according to the differential lock switch signal. | |
Blinking: Blinks at 0.5 second intervals (0.5 seconds on and 0.5 seconds off)
Rapidly blinking: Blinks at 0.25 second intervals (0.25 seconds on and 0.25 seconds off)