wiring LEXUS LS430 2003 Factory Manual PDF

Fig. 152: Checking Harness And Connector (Air Conditioning Amplifier - Body Ground)
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OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
This is the power source for the A/C amplifier and servomotors, etc.
WIRING DIAGRAM

Fig. 156: Identifying Blower Motor Circuit Description
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WIRING DIAGRAM
Fig. 157: Blower Motor Circuit

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INSPECTION PROCEDURE
1.READ VALUE ON HAND-HELD TESTER
a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position and push the hand-held tester main switch on.
c. Select the item below in the DATA LIST, and read the displa
y on the hand-held tester.

Fig. 164: Identifying Waveform Between Terminal BLW (A11-5) Of A/C Amplifier And Body
Ground
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OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
CIRCUIT DESCRIPTION
This is the backup power source for the rear A/C amplifier. Power is supplied even when the ignition switch is
off and is used for memory, etc.
WIRING DIAGRAM

Fig. 167: Inspecting Rear Air Conditioning Amplifier (R-B - Body Ground)
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OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
CIRCUIT DESCRIPTION
The main power source is supplied to the A/C amplifier when the ignition switch is turned to the ON position.
The power source supplied is used for operating the A/C amplifier and servomotor, etc.
WIRING DIAGRAM

Fig. 171: Checking Harness And Connector (Rear Air Conditioning Amplifier - Body Ground)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: REPLACE REAR AIR CONDITIONING AMPLIFIER (SEE OVERHAUL
)
CIRCUIT DESCRIPTION
The luggage room J/B ECU requests the rear A/C amplifier to operate the rear blower motor and controls its
operation via the rear blower resistor in this circuit.
WIRING DIAGRAM

Fig. 180: Checking Harness And Connector (Blower Motor -Blower Resistor)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE OR REPLACE HARNESS OR CONNECTOR
REPLACE REAR AIR CONDITIONING AMPLIFIER (SEE OVERHAUL
)
CIRCUIT DESCRIPTION
The exhaust damper control servomotor is controlled by the luggage room J/B ECU and moves the rear exhaust
damper to the desired position.
WIRING DIAGRAM
Fig. 181: Exhaust Damper Control Servomotor Circuit

Fig. 183: Checking Harness And Connector (Exhaust Servomotor -Rear Air Conditioning
Amplifier)
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OK: REPLACE REAR AIR CONDITIONING AMPLIFIER (SEE OVERHAUL
)
CIRCUIT DESCRIPTION
The rear magnetic valve is controlled by luggage room J/B ECU and A/C amplifier operation.
WIRING DIAGRAM
Fig. 184: Rear Magnetic Valve Circuit

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INSPECTION PROCEDURE
1.INSPECT LUGGAGE ROOM J/B ECU (RMGV - BODY GROUND)

CIRCUIT DESCRIPTION
This sensor detects the smoke inside the cabin and sends the appropriate signals to the luggage room J/B ECU.
WIRING DIAGRAM
Fig. 189: Smoke Sensor Circuit

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INSPECTION PROCEDURE
1.INSPECT LUGGAGE ROOM J/B ECU (RMGV - BODY GROUND)
a. Remove the luggage room J/B ECU with connectors still connected.
b. Measure the voltage according to the value (s) in the table below when applying or not applying

Fig. 193: Checking Harness And Connector (Luggage Room J/B -Smoke Sensor)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE LUGGAGE ROOM J/B ECU
CIRCUIT DESCRIPTION
The intelligent swing register is controlled by the A/C amplifier. It is activated by selecting FACE or BI-
LEVEL on the mode select switch and turning the swing register switch on.
WIRING DIAGRAM

Fig. 8: Problem Symptoms Table
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HINT:
Inspect the connectors from the back side while connectors are connected.
SUSPENSION CONTROL ECU:
Fig. 9: Identifying Suspension Control ECU Connector Terminals

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TERMINALS NUMBER AND SPECIFIED CONDITION
Symbols
(Terminals No.)Wiring
ColorTerminal DescriptionConditionSpecified
Condition
B (A20-1) - GND
(A20-4)W-R - W-
BBatteryAlways10 to 14 V
VT (A20-3) -
GND (A20-4)Y - W-B
Absorber control
indicator lamp output
signalIG switch ON, absorber control
switch "SPORT"0 to 1.5 V
VT (A20-3) -
GND (A20-4)Y - W-B
Absorber control
indicator lamp output
signalIG switch ON, absorber control
switch "NORM"10 to 14 V
GND (A20-4) -
Body groundW-B -
Body
ground
GroundAlwaysBelow 1
ohms
SLEX (A20-5) -
GND (A20-4)V-Y - W-BExhaust solenoid valveIG switch ONBelow 1 V
SLEX (A20-5) -
GND (A20-4)V-Y - W-BExhaust solenoid valveEngine idling, absorber control
switch from "HIGH" to "NORM"8 V or more
RC (A20-6) -
GND (A20-4)Y-R - W-BAIR SUS relayIG switch ONBelow 1 V