SYSTEM DESCRIPTION
1. DESCRIPTION
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.
for 2WD:
When 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.
2. INDICATOR LIGHT AND BUZZER OPERATING CONDITIONS
(a) for 4WD:
Mode |
2WD/4WD Mode Status |
Rear Differential Lock Indicator Light |
4WD Indicator Light (Green) and 4LO Indicator Light |
Buzzer |
---|---|---|---|---|
Rear differential free |
2WD or H4 |
Not illuminated |
Turned off or illuminated to display 2WD 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 |
2WD, H4 or L4 |
Rapidly blinking |
Illuminated |
Not sounding |
(b) for 2WD:
Mode |
Rear Differential Lock Indicator Light |
Buzzer |
---|---|---|
Rear differential free |
Not illuminated |
Not sounding |
Rear differential switching between free and locked |
Blinking |
Not sounding |
Rear differential locked |
Illuminated |
Not sounding |
Rear differential lock malfunction |
Rapidly blinking |
Not sounding |
3. 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. |
|
Differential Lock 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. for 4WD: When the differential lock switch is pressed while not in L4, the indicator light blinks 3 times and the buzzer sounds 3 times. HINT: When the rear differential is in the locked condition, ABS, VSC and TRAC 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. |
Operation Check
OPERATION CHECK
1. CHECK WIRELESS CHARGING SYSTEM OPERATION
(a) Turn the ignition switch ON (IG or ACC).
(b) Press the mobile wireless charger switch and check that the switch indicator
light illuminates.
Text in Illustration
*a
Switch Indicator Light
(c) Plac ...
Terminals Of Ecu
TERMINALS OF ECU
1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
(a) Disconnect the 1D and 1F driver side junction block connectors.
(b) Measure the voltage and resistance according to the value(s) in the table
below.
HINT:
Measure the values on the wire harness side with the connectors ...
Push Switch / Key Unlock Warning Switch Malfunction (B2780)
DESCRIPTION
This DTC is stored if the transponder key ECU assembly does not detect that the
unlock warning switch assembly is ON even when the key is in the ignition key cylinder.
Under normal conditions, the unlock warning switch assembly is ON when the key is
in the ignition key cylinder.
...