Toyota LAND CRUISER, Service Manual Supplement

Page: 310 / 409

BODY ELECTRICAL SYSTEM - CRUISE CONTROL SYSTEM
BE-31
SYSTEM DESCRIPTION
• When the ignition switch is turned ON, current flows from the battery to terminal 14 of the cruise control
(CC ECU.
• Terminal 13 of the CC ECU is always grounded.
Basic Operation
HINT: For all explanations below, the ignition switch is in the ON position.
1. MAIN SWITCH OPERATION
When the main switch is pushed ON, current flows from terminal 4 of the CC ECU terminal B-1 5 of
the control switch terminal B-20 of the switch ground.
As a result, the CC ECU is on standby and terminal 5 of the CC ECU is grounded. Therefore the CC in-
dicator lights up.
2. CONTROL SWITCH OPERATION
The control switch controls the SET, COAST, RESUME, ACCEL and CANCEL functions. When the con-
trol switch is turned to each position, current flows from terminals 18 of the CC ECU terminals B-5
of the control switch terminal B-20 of the switch ground.
In the way, the CC ECU detects each position the control switch is turned to, and starts operation.
HINT: The SET function is detected by the CC ECU when the control switch released from
SET/COAST.
3. SPEED CONTROL OPERATION
When the vehicle speed is set by the control switch, the ECU sends signal from terminal 10 terminal
2 of the stop light switch terminal 4 of the switch terminal 5 of the actuator (magnetic clutch)
terminal 4 of the actuator ground.
At the same time, the CC ECU sends the signal from terminal 24 terminal 1 of the actuator (posi-
tion sensor) terminal 3 of the actuator terminal 26 of the CC ECU. When the occurs, the position
sensor sends the position of the actuator arm as a signal (voltage) from terminal 2 of the actuator to ter-
minal 25 of the CC ECU.
When the actual vehicle speed drops below the set speed, the CC ECU sends a signal (voltage) from ter-
minal 1 2 terminal 6 of actuator (motor) terminal 7 of actuator terminal 11 of CC ECU. This
causes the motor to rotate the actuator arm in the throttle opening direction, increasing the vehicle
speed. Then, when the arm reaches the prescribed angle, the CC ECU detects this at terminal 25 and
stops the signal from 1 2.
When the actual vehicle speed rises above the set speed, the CC ECU sends a signal from terminal 11,
turning the motor in the opposite direction so that the vehicle speed is reduced.
4. MANUAL CANCEL OPERATION
The CC system has the following methods of cancellation:
• Speed Control Switch (CANCEL)
When the control switch is turned to CANCEL position.
• Parking Brake Switch
When the parking brake lever is pulled, the parking brake switch is turned ON and sends a cancella-
tion signal (ground voltage) to terminal 3 of the CC ECU.
• Neutral Start Switch (A/T)
When the shift lever is set to " N " or " P " range, the neutral start switch is turned ON and sends a
cancellation signal (ground voltage) to terminal 2 of the CC ECU.
• Stop Light Switch
When the brake pedal is depressed, SW B of the stop light switch is turned OFF, the magnetic clutch
(in actuator) is released, and SW A of the stop light switch is turned ON and sends a cancellation
signal (battery voltage) to terminal 16 of the CC ECU.
When the CC ECU detects any of the above signals, it stops output of signals to the actuator, and
cancels cruise control.