Lexus RX300 (MCU15). Manual — part 312
DI6QT–04
I19137
Cruise Control Actuator
D
Actuator Motor
D
Actuator Magnetic Clutch
Park/Neutral Position
Switch
CRUISE MAIN Indicator
Light
Cruise Control ECU
Stop Light Switch
Instrument Panel J/B
D
GAUGE Fuse
D
ECU–IG Fuse
D
HEATER Fuse
Cruise Control Switch
D
Main Switch
D
Control Switch
LHD:
RHD:
CRUISE MAIN Indicator
Light
Instrument Panel J/B
D
GAUGE Fuse
D
ECU–IG Fuse
D
HEATER Fuse
Stop Light Switch
Cruise Control ECU
Cruise Control Switch
D
Main Switch
D
Control Switch
DI–480
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
LEXUS RX300 (RM785E)
PARTS LOCATION
DI1KT–15
I00293
C16
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–481
LEXUS RX300 (RM785E)
TERMINALS OF ECU
Symbols (Terminals No.)
Wiring Color
Condition
STD Voltage (V)
STP ↔ GND
G W ↔ BR
Depress brake pedal
10 – 16 V
STP ↔ GND
(C16–3 ↔ C16–16)
G–W ↔ BR
Release brake pedal
Below 1 V
D ↔ GND (C16 4 ↔ C16 16)
G B ↔ BR
Shift to positions except D
Below 1 V
D ↔ GND (C16–4 ↔ C16–16)
G–B ↔ BR
Shift to D position
10 – 16 V
PI ↔ GND (C16 5 ↔ C16 16)
W G ↔ BR
Ignition switch ON
Cruise control main switch ON
Below 1.2 V
PI ↔ GND (C16–5 ↔ C16–16)
W–G ↔ BR
Ignition switch ON
Cruise control main switch OFF
10 – 16 V
TC ↔ GND
Ignition switch ON
10 – 16 V
TC ↔ GND
(C16–10 ↔ C16–16)
P–B ↔ BR
Ignition switch ON
Connect terminals Tc and E1 of diagnostic check connector
Below 1 V
ECT ↔ GND
R Y ↔ BR
During driving
Gear position 3rd
10 – 16 V
ECT ↔ GND
(C16–6 ↔ C16–16)
R–Y ↔ BR
During driving
Gear position O/D
Below 1 V
MC ↔ GND
L R ↔ BR
During cruise control driving
COAST switch held ON
9 – 15 V
MC ↔ GND
(C16–7 ↔ C16–16)
L–R ↔ BR
During cruise control driving
ACC switch held ON
Below 1 V
L ↔ GND
L Y ↔ BR
During cruise control driving
9 – 15 V
L ↔ GND
(C16–8 ↔ C16–16)
L–Y ↔ BR
Except during cruise control driving
Below 1 V
B ↔ GND
(C16–2 ↔ C16–16)
B–R ↔ BR
Ignition switch ON
10 – 16 V
Ignition switch ON
10 – 16 V
Ignition switch ON
CANCEL switch held ON
6.0 – 11.0 V
CCS ↔ GND
(C16–11 ↔ C16–16)
L ↔ BR
Ignition switch ON
SET/COAST switch held ON
4.0 – 7.9 V
(
)
Ignition switch ON
RES/ACC switch held ON
2.0 – 4.6 V
Ignition switch ON
MAIN switch held ON
Below 0.5 V
DI–482
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
LEXUS RX300 (RM785E)
SPD ↔ GND
(C16 12 ↔ C16 16)
V–W ↔ BR
Engine start
Car stoppage.
Below 1.5 V or
4.7 – 16 V
(C16–12 ↔ C16–16)
V W ↔ BR
During driving (Pulse generated).
3 – 7 V
IDL ↔ GND
B Y ↔ BR
Ignition switch ON
Throttle valve fully opened.
10 – 16 V
IDL ↔ GND
(C16–13 ↔ C16–16)
B–Y ↔ BR
Ignition switch ON
Throttle valve fully closed.
Below 1.5 V
OD ↔ GND
Y G ↔ BR
During cruise control driving
OD switch ON.
10 – 16 V
OD ↔ GND
(C16–14 ↔ C16–16)
Y–G ↔ BR
During cruise control driving
OD switch OFF (3rd driving)
Below 1 V
MO ↔ GND
L B ↔ BR
During cruise control driving
ACC switch hold ON
9 – 15 V
MO ↔ GND
(C16–15 ↔ C16–16)
L–B ↔ BR
During cruise control driving
COAST switch hold ON
Below 1 V
GND ↔ Body Ground
(C16–16 ↔ Body Ground)
BR ↔ Body
Ground
Constant
Below 1 V
DI08L–22
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–483
LEXUS RX300 (RM785E)
PROBLEM SYMPTOMS TABLE
Symptom
Suspect Area
See page
SET not occurring or CANCEL occurring.
(DTC is Normal)
13.Main Switch Circuit (Cruise control switch)
14.Vehicle Speed Sensor
15.Control Switch Circuit (Cruise control switch)
16.Stop Light Switch Circuit
17.Neutral Start Switch Circuit
18.Actuator Motor Circuit
19.Cruise Control Cable
20.Cruise Control ECU
DI–502
DI–492
DI–502
DI–505
DI–507
DI–484
DI–516
IN–32
SET not occurring or CANCEL occurring.
(DTC dose not output)
1. ECU Power Source Circuit
2. Cruise Control ECU
DI–499
IN–32
Actual vehicle speed deviates above or below the set speed.
1. Cruise Control Cable
2. Vehicle Speed Signal Abnormal
3. Electronically Controlled Transmission
Communication Circuit
4. Actuator Motor Circuit
5. Idle Signal Circuit (Main throttle position sensor)
6. Cruise Control ECU
DI–516
DI–492
DI–517
DI–484
DI–496
IN–32
Gear shifting frequent between 3rd O/D when driving on uphill
road. (Hurting)
1. Electronically Controlled Transmission
Communication Circuit
2. Cruise Control ECU
DI–517
IN–32
Cruise control not cancelled, even when brake pedal is de-
pressed.
1. Cruise Control Cable
2. Stop Light Switch Circuit
3. Actuator Motor Circuit
4. Cruise Control ECU
DI–516
DI–505
DI–484
IN–32
Cruise control not cancelled, even when transmission is shifted to
”N” position.
1. Cruise Control Cable
2. Neutral Start Switch Circuit
3. Actuator Motor Circuit
4. Cruise Control ECU
DI–516
DI–507
DI–484
IN–32
Cruise control not cancelled, even when clutch pedal is de-
pressed.
1. Cruise Control Cable
2. Actuator Motor Circuit
3. Cruise Control ECU
DI–516
DI–484
IN–32
Control switch does not operate.
(SET/COAST, ACC/RES, CANCEL not possible)
1. Cruise Control Cable
2. Control Switch Circuit
3. Actuator Motor Circuit
4. Cruise Control ECU
DI–516
DI–510
DI–484
IN–32
SET possible at 40 km/h (25 mph) or less, or CANCEL does not
operate at 40 km/h (25 mph) or less.
1. Cruise Control Cable
2. Vehicle Speed Signal Abnormal
3. Actuator Motor Circuit
4. Cruise Control ECU
DI–516
DI–495
DI–484
IN–32
Poor response is in ACCEL and RESUME modes.
1. Cruise Control Cable
2. Electronically Controlled Transmission
Communication Circuit
3. Actuator Motor Circuit
4. Cruise Control ECU
DI–516
DI–517
DI–484
IN–32
O/D does not resume, even though the road is not uphill.
1. Electronically Controlled Transmission
Communication Circuit
2. Cruise Control ECU
DI–517
IN–32
DTC memory is erased.
Cruise Control ECU
IN–32
DTC is not output, or is output when should not be.
1. Diagnosis Circuit
2. Cruise Control ECU
DI–514
IN–32
Cruise MAIN indicator light remains ON or falls to light up.
Cruise MAIN Indicator Light Switch Circuit
DI–514
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