Lexus RX300 (MCU15). Manual — part 319
Input Signal
Indicator Light
Blinking Pattern
Turn PNP switch
OFF (Shift to posi-
tions except D )
Light
ON
OFF
SW ON
SW OFF
DI–508
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check starter operation.
CHECK:
Check that the starter operates normally and that the engine starts.
NG
Replace starter.
OK
2
Input signal check.
PREPARATION:
See input signal check on page DI–474.
CHECK:
Check the indicator light when shifting into positions except D.
OK:
The indicator light goes off when shifting into posi-
tions except D.
OK
Proceed to next circuit inspection shown in
problem symptom table (See page DI–483).
NG
I16975
ON
D
(–)
(+)
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–509
LEXUS RX300 (RM785E)
3
Check voltage between terminal D of cruise control ECU connector and body
ground.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminal D of ECU connector and
body ground when shifting into D range and other positions.
OK:
Shift Position
Voltage
D position
10 – 14 V
Other positions
Below 1 V
OK
Proceed to next circuit inspection shown in
problem symptom table (See page DI–483).
NG
4
Check harness and connector between cruise control ECU and neutral start
switch (See page IN–32).
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN–32).
Input Signal
Indicator Light
Blinking Pattern
Clutch switch
OFF (Depress
clutch pedal)
Light
ON
OFF
SW ON
SW OFF
DI–510
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
LEXUS RX300 (RM785E)
Clutch Switch Circuit
CIRCUIT DESCRIPTION
When the clutch pedal is depressed, the clutch switch sends a signal to the cruise control ECU. When the
signal is input to the cruise control ECU during cruise control driving, the cruise control ECU cancels cruise
control.
WIRING DIAGRAM
Refer to neutral start switch circuit on page DI–507.
INSPECTION PROCEDURE
1
Check starter operation.
CHECK:
Check that the starter operates normally and that the engine starts.
NG
Proceed to engine troubleshooting.
OK
2
Input signal check.
PREPARATION:
See input signal check on page DI–474.
CHECK:
Check the indicator lights when clutch pedal is depressed.
OK:
The indicator light goes off when shifting into clutch
pedal is depressed.
OK
Proceed to next circuit inspection shown in
problem symptom table (See page DI–483).
NG
DI08W–08
I16976
ON
D
(–)
(+)
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–511
LEXUS RX300 (RM785E)
3
Check voltage between terminal D of cruise control ECU and body ground.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminal D of cruise control ECU con-
nector and body ground when clutch pedal is depressed and
pushed in.
OK:
Shift Position
Voltage
Clutch pedal depressed
10 – 14 V
Clutch pedal pushed in
Below 1 V
OK
Proceed to next circuit inspection shown in
problem symptom table (See page DI–483).
NG
4
Check for open in harness and connector between ECU and GAUGE fuse (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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