Lexus ES300 (1997 year). Manual — part 428
AB0119
N19821
I00737
ON
1
2
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–489
641
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check resistance between terminals MO and MC of actuator motor.
PREPARATION:
(a)
Turn ignition switch OFF.
(b)
Disconnect the actuator connector.
CHECK:
Measure resistance between terminals 1 and 2.
HINT:
If control plate position is fully opened or fully closed, resistance
can not measure.
OK:
Resistance: more than 4.2
Ω
NG
Replace cruise control actuator.
OK
2
Check for open and short in harness and connectors between cruise control
ECU and actuator motor (See page
).
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU.
(See page
).
N21217
Cruise Control ECU
2
1
3
4
3
to STOP Fuse
8
Stop Light Switch
4
Cruise Control Actuator
Actuator Magnetic Clutch
J8
J8
A
A
Junction
Connector
1J
1J
A
Junction
Connector
Instrument
Panel J/B
Instrument
Panel J/B
1R
1R
A
A
Junction
Connector
2
L
STP–
J15
J3
J10
J27
C14
C14
G–W
G–W
G–W
W–B
R–Y
G–B
W–B
W–B
W
4
5
7
8
II
DI–490
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
642
1997 LEXUS ES300 (RM511U)
DTC
12
Actuator Magnetic Clutch Circuit
CIRCUIT DESCRIPTION
This circuit turns on the magnetic clutch inside the actuator during cruise control operation according to the
signal from the ECU. If a malfunction occurs in the actuator or speed sensor, etc. during cruise control opera-
tion, the rotor shaft between the motor and control plate is released.
When the brake pedal is depressed, the stop light switch turns on, supplying electrical power to the stop light.
Power supply to the magnetic clutch is mechanically cut and the magnetic clutch is turned OFF.
When driving downhill, if the vehicle speed exceeds the set speed by 15 km/h (9 mph), the ECU turns the
safety magnet clutch OFF. If the vehicle speed later drops to within 10 km/h (6 mph) above the set speed,
then cruise control at the set speed is resumed.
DTC No.
Detection Item
Trouble Area
12
Short in actuator magnetic clutch circuit.
Open (0.8 sec.) in actuator magnetic clutch circuit.
STOP Fuse
Stop light switch
Actuator magnetic clutch
Harness or connector between cruise control ECU and
actuator magnetic clutch, actuator magnetic clutch and body
ground
Cruise control ECU
WIRING DIAGRAM
DI0EP–01
N20675
Instrument Panel Junction Block No.1
STOP Fuse
N09044
2
1
4
3
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–491
643
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check STOP fuse.
PREPARATION:
(a)
Turn ignition switch OFF.
(b)
Remove the STOP fuse from instrument panel junction
block No.1.
CHECK:
Check fuse continuity.
OK:
There is continuity.
NG
Replace STOP fuse.
OK
2
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
N21919
4
3
DI–492
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
644
1997 LEXUS ES300 (RM511U)
3
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
4
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
).
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page
).
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