Lexus RX300 (MCU15). Manual — part 314
I00133
2
1
4
3
I00311
4
3
DI–488
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check stop light switch.
PREPARATION:
Disconnect the stop light switch connector.
CHECK:
Check continuity between terminals.
Switch position
Continuity
Switch pin free
(Brake pedal depressed)
1 – 2
Switch pin pushed in
(Brake pedal released)
3 – 4
NG
Replace stop light switch.
OK
2
Check resistance between terminals L and GND of actuator magnetic clutch.
PREPARATION:
(a)
Turn ignition switch OFF.
(b)
Disconnect the actuator connector.
CHECK:
Measure resistance between terminals 3 and 4.
OK:
Resistance: 34.65 – 42.35 Ω.
NG
Replace cruise control actuator.
OK
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–489
LEXUS RX300 (RM785E)
3
Check for open and short in harness and connectors between cruise control
ECU and actuator magnetic clutch, actuator magnetic clutch and body ground
(See page IN–32).
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN–32).
I00055
4
3
(+)
(–)
DI–490
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
LEXUS RX300 (RM785E)
DTC
14
Actuator Mechanical Malfunction
CIRCUIT DESCRIPTION
The circuit detects the rotation position of the actuator control plate and sends a signal to the ECU.
DTC No.
Detection Item
Trouble Area
14
Cruise control actuator mechanical malfunction.
S
Actuator lock: (motor, arm)
S
Actuator motor
S
Cruise control ECU
WIRING DIAGRAM
See page DI–486.
INSPECTION PROCEDURE
1
Check cruise control actuator arm locking operation
PREPARATION:
(a)
Turn ignition switch OFF.
(b)
Disconnect the actuator connector.
CHECK:
Connect the positive (+) lead from the battery to the terminal 3
of actuator and the negative (–) lead to terminal 4.
NOTICE:
Do not connect the high tension cables to the wrong bat-
tery terminal. The cruise control actuator will be damaged.
Move the control plate by hand.
OK:
Control plate doesn’t move.
NG
Replace cruise control actuator.
OK
DI08O–21
I03209
Fully open side
Control plate
4
3 2
1
(+)
(–)
Fully close side
Control plate
(–)
(+)
4
3
2
1
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–491
LEXUS RX300 (RM785E)
2
Check cruise control actuator operation.
PREPARATION:
(a)
Turn ignition switch OFF.
(b)
Disconnect the actuator connector.
CHECK:
Connect the positive (+) lead from the battery to terminals 1 and
3 of actuator, connect the negative (–) lead to terminals 2 and
4 of actuator.
OK:
Control arm moves to fully open side
CHECK:
Connect the positive (+) lead from the battery to terminals 2 and
3 of actuator, connect the negative (–) lead to terminals 1 and
4 of actuator.
OK:
Control arm moves to fully closed side
NG
Replace cruise control actuator.
OK
3
Check harness and connector between cruise control ECU and cruise control ac-
tuator (See page IN–32).
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN–32).
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