1991 LEXUS SC300 cruise control

REMOVAL OF STARTER
(See Components on page ST±5)
1. DISCONNECT CABLE FROM NEGATIVE TERMINAL OF BATTERY
CAUTION: Work must be started after approx. 20 se-
conds or longer from the time the ignition switch is
turned to the ºLOCKº position and the negative (±) termi-
nal cable is disconnected from the battery.
2. DRAIN ENGINE COOLANT
3. REMOVE THROTTLE BODY COVER (a) Remove the mounting cap nut.
(b) Loosen the two bolts, and remove the throttle bodycover.
4. DISCONNECT CONTROL CABLES FROM THROTTLE BODY
Disconnect the following cables:(1) Accelerator cable
(2) A/T throttle control cable
(3) (w/ Cruise Control System) Cruise control actuator cable
5. REMOVE INTAKE AIR CONNECTOR (a) Disconnect the following hoses:(1) Air hose from ISC valve
(2) Air hose (from PS air control valve) from intake air
connector
(b) Remove the bolt holding the intake air connector to the cylinder head cover.
(c) Loosen the two hose clamps.
(d) Disconnect the intake air connector from the throttle
body and air cleaner hose, and remove the intake air
connector.
ST±6
±
STARTING SYSTEM Starter
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24. CONNECT CONTROL CABLES TO THROTTLE BODYConnect the following hoses:(1) Accelerator cable
(2) A/T throttle control cable
(3) (w/ Cruise Control System) Cruise control actuator cable
25. INSTALL THROTTLE BODY COVER Install the throttle body cover and hose clamp with the two
bolts and cap nut.
26. C O N N E C T C A B L E TO N E G AT I V E T E R M I N A L O F BATTERY
27. FILL WITH ENGINE COOLANT (See page CO±7)
28. CHECK THAT ENGINE STARTS
ST±34
±
STARTING SYSTEM Starter
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REMOVAL OF STARTER
(See Components on page ST±5)
1. DISCONNECT CABLE FROM NEGATIVE TERMINAL OF BATTERY
CAUTION: Work must be started after approx. 20 se-
conds or longer from the time the ignition switch is
turned to the ºLOCKº position and the negative (±) termi-
nal cable is disconnected from the battery.
2. DRAIN ENGINE COOLANT
3. REMOVE THROTTLE BODY COVER (a) Remove the mounting cap nut.
(b) Loosen the two bolts, and remove the throttle bodycover.
4. DISCONNECT CONTROL CABLES FROM THROTTLE BODY
Disconnect the following cables:(1) Accelerator cable
(2) A/T throttle control cable
(3) (w/ Cruise Control System) Cruise control actuator cable
5. REMOVE INTAKE AIR CONNECTOR (a) Disconnect the following hoses:(1) Air hose from ISC valve
(2) Air hose (from PS air control valve) from intake air
connector
(b) Remove the bolt holding the intake air connector to the cylinder head cover.
(c) Loosen the two hose clamps.
(d) Disconnect the intake air connector from the throttle
body and air cleaner hose, and remove the intake air
connector.
ST±6
±
STARTING SYSTEM Starter
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24. CONNECT CONTROL CABLES TO THROTTLE BODYConnect the following hoses:(1) Accelerator cable
(2) A/T throttle control cable
(3) (w/ Cruise Control System) Cruise control actuator cable
25. INSTALL THROTTLE BODY COVER Install the throttle body cover and hose clamp with the two
bolts and cap nut.
26. C O N N E C T C A B L E TO N E G AT I V E T E R M I N A L O F BATTERY
27. FILL WITH ENGINE COOLANT (See page CO±7)
28. CHECK THAT ENGINE STARTS
ST±34
±
STARTING SYSTEM Starter
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222
COMBINATION METER
O/D OFF
CRUISE CONTROL
3A
10 3A 9
3C
1
IG1
5 1I
3
A
5
G±O
G±O
G±O
C
5C 4C3C2
413
A
20 A 18
3C
43B 4
3D
63D 53D5
3F
4
3E
1
IG1
15
TO ENGINE AND
ECT ECU (
OD2 )
TO CRUISE
CONTROL
ECU
(
PI )
TO TDCL
( A/D )
TO O/D MAIN SW TO TDCL (
ECT )
RHEOSTAT
2 87
G± O
G±O
G±O
FROM POWER SOURCE SYSTEM(
SEE PAGE 56 )
7. 5A
PANEL (CANADA )
( CANADA )
(
USA )
I16
INTEGRATION
RELAY
COMBINATION METER C12 , C 1 3 , C1 4 ABC
Y±B
BR
Y±V L±B
L
G±O
Y±B
Y±B
Y±B
W±B
W±B 12
GR±R
GR±R
GR±R
GR±R WASHER
B
9
IE 1
10 IG1
18
1
EB
W1
WASHER LEVEL SW P±L
P±L
P±L
W±B
3H 1
G±O
TO A/T INDICATOR LIGHT
( FOR SHIFT LEVER )
ILLUMINATION I8
L
L
TO A/C AND AUDIO
ILLUMINATION
A
2 R9
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26
ELECTRICAL WIRING ROUTING
Position of Parts in Engine Compartment
A 1 A/C Ambient Temp. Sensor E 1 ECT Solenoid
A 2 A/C Lock Sensor and A/C Magnetic Clutch E 2 EFI Water Temp. Sensor
A 3 A/C High Pressure SW E 3 EGR Gas Temp. Sensor (for USA Spec.)
A 4 ABS Actuator E 5 Engine Hood Courtesy SW
A 5 ABS Actuator (w/ Traction Control) E 6 Engine Oil Level Warning SW
A 6 ABS Actuator (w/ Traction Control)
A 7 ABS Speed Sensor Front LH F 1 Front Airbag Sensor LH
A 8 ABS Speed Sensor Front RH F 2 Front Airbag Sensor RH
A 9 Air Flow Meter F 3 Front Clearance Light LH
A 10 Alternator F 4 Front Clearance Light RH
A 11 Alternator F 5Front Side Marker Light LH
A 33 ABS Actuator (w/o Traction Control) F 6 Front Side Marker Light RH F 7 Front Turn Signal Light LH
B 1 Brake Fluid Level SW F 8 Front Turn Signal Light RH
B 6 Back±Up Light SW (for M/T) F 9 Fuse Block
C 3 Check Connector H 1 Headlight Hi LH
C 6 Cornering Light LH H 2 Headlight Hi RH
C 7 Cornering Light RH H 3 Headlight Lo LH
C 8 Cruise Control Actuator H 4 Headlight Lo RH H 5 Horn LH
D 13 Distributor H 6 Horn RH
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28
ELECTRICAL WIRING ROUTING
Position of Parts in Instrument Panel
A 12 A/C Control Assembly C 9 CD Player
A 13 A/C Control Assembly C 10 Center Airbag Sensor Assembly
A 14 A/C Control Assembly C 11 Cigarette Lighter
A 15 A/C Control SW and Radio SW C 12 Combination Meter
A 16 A/C Evaporator Temp. Sensor C 13 Combination Meter
A 17 A/C Power Transistor C 14Combination Meter
A 18 A/C Power Transistor C 15 Combination SW
A 19 A/C Room Temp. Sensor C 16 Combination SW
A 20 A/C Solar Sensor C 17 Combination SW
A 21 A/T Indicator Light (for Shift Lever) C 19 Cruise Control ECU
A 22 ABS ECU (for M/T, w/o Traction Control) C 23 Clutch Start SW
A 23 ABS ECU (for M/T, w/o Traction Control) C 24 Cruise Control Clutch SW
A 24 ABS and Traction ECU
A 25 ABS and Traction ECU D 1 Diode (for Brake Fluid Level)
A 26 ABS and Traction ECU D 2 Diode (for Parking Brake)
A 27 Air Mix Control Servo Motor D 3 Diode (for Tension Reduser)
A 28 Air Vent Mode Control Servo Motor
A 29 Airbag Squib E 8 ECT Pattern Select SW
A 33 Air Inlet Control Servo Motor E 9 Engine and ECT ECU (for A/T) E 10 Engine and ECT ECU (for A/T)
B 2 Blower Motor E 11 Engine ECU (for M/T)
B 3 Blower Resistor (for Low Speed) E 12 Engine ECU (for M/T)
F 10 Fuel Lid Opener SW
G 1 Glove Box Light
G 2 Glove Box Light SW
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148
CRUISE CONTROL
1E
12 1K 13 2 1
3F
4
1B
5
3E
1
B BATT
A
1 A
14SPD GND CMS CCS PI TC
A
10 B 20
11
4
10
IG1
7
IK1
10
10A
DOME
15A
ECU±IG
10A
GAUGE
1H
10
CRUISE CONTROL
INDICATOR LIGHT
[COMB. METER]
TDCL CHECKCONNECTOR
CRUISE CONTROL ECU
CRUISE CONTROL SW
[COMB. SW]
E CMS
CCS
MAIN
CANCEL
RESUME/
ACCEL
SET/
COAST
CRUISE CONTROL
A/D TC TC
Y±BY±BL
15
5
R
R B±R
Y
Y
PP W±B
BR
W±B Y±B P±B
P±B P±B R±L
L
Y±B
P±B
Y±B
C19
C15
T6 C3
FROM POWER SOURCE SYSTEM
(
SEE PAGE 56 )
IG1
13
IG1
15
3A
8
3H
12
3E
3
IH IG 20 13 4 18 5 8
6
14 15
3A
4
3D
13
W±B
W±BP±B
C12 ,C1 4
A
B
3C4
2
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