2003 LEXUS LS430 fuses

Fig. 18: Power Source Circuit (Driver Door ECU) - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT FUSE (MPX-B1, AM1, MPX-IG, D DOOR)
a. Remove the MPX-IG and AM1 fuses from the driver side J/B.
b. Remove the D DOOR and MPX-B1 fuses from the passenger side J/B.
c. Measure the resistance of the fuse.
Standard: Below 1 ohms

Fig. 15: Connecting Hand-Held Tester DLC3
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Select the ACTIVE TEST mode on the hand-held tester.
d. Please refer to the hand-held tester operator's manual for further details.
e. Check that there is pressure in the fuel inlet hose from the fuel filter.
HINT:
If there is fuel pressure, you will hear the sound of fuel flowing. If there is no pressure, check the
fusible link, fuses, EFI MAIN relay, fuel pump, ECM and wiring connections.
f. Turn the ignition switch to LOCK.
g. Disconnect the hand-held tester from the DLC3.
2.CHECK FUEL PRESSURE
a. Check that the battery positive voltage is above 12 V.
b. Disconnect the negative (-) terminal cable from the battery.
c. Remove the fuel pressure pulsation damper from the RH delivery pipe (see REPLACEMENT
).
d. Install the fuel pipe sub-ass
y No. 2 and SST (pressure gauge) to the delivery pipe with the 3 lower

Fig. 2: Identifying Engine Room No. 1 Junction & Relay Block Components
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Engine Room No. 1 Junction & Relay Block Fuses
FuseSystem
7.5AA/C IGAutomatic Air Conditioning (Front)
7.5AEFI NO.2Engine Control
7.5AFR IGABS
Automatic Air Conditioning (Front)
Back-Up Light
Charging
Clock (w/ LEXUS Navigation System)
Cruise Control
Door Closer (w/ Smart Key System)
Door Closer (w/o Smart Key System)
Door Lock Control (w/ Smart Key System)
Door Lock Control (w/o Smart Key System)

Fig. 3: Identifying Fusible Link Block Components
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fusible Link Block Fuses
FuseSystem
5AALT-SCharging
30AABS 1Dynamic Radar/Laser Cruise Control System
Tire Pressure Warning System
TRAC
VSC
30ABATTEngine Control
Engine Immobilizer System (w/o Smart Key System)
SRS
Starting and Ignition
30ASTElectronically Controlled Transmission and A/T Indicator
Engine Control
Starting and Ignition
40AAIRBUSElectronic Modulated Air Suspension
40ADEFOGRear Window Defogger
50AABS 2ABS
Dynamic Radar/Laser Cruise Control System
Tire Pressure Warning System
TRAC
VSC
50AFANRadiator Fan
50AHEATERAutomatic Air Conditioning (Front)
60ALUG J/BAudio System
Automatic Light Control
Back-Up Light
Climate Control Seat (Rear)
Clock (w/ LEXUS Navigation System)
Door Closer (w/ Smart Key System)
Door Lock Control (w/ Smart Key System)
Dynamic Radar/Laser Cruise Control System
Interior Light
Key Reminder (w/ Smart Key System)
LEXUS Navigation System
LEXUS Parking Assist (Clearance Sonar)
LEXUS Parking Assist (Clearance Sonar)
Light Auto Turn Off System
Multiplex Communication System (BEAN - Steering Column Bus)
Pre-Collision Safety System
Rear Air Conditioning
Smart Key System
Stop Light
Taillight

Fig. 5: Identifying Driver Side Junction Block Components (Fuses)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 6: Identifying Driver Side Junction Block Components (Relays)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Driver Side Junction Block Fuses
FuseSystem

PASSENGER SIDE JUNCTION BLOCK
Fig. 7: Identifying Passenger Side Junction Block Components (Fuses)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
15AD S/HTRClimate Control Seat (Front)
Seat Heater (Front)
15AD-CIGCigarette Lighter and Power Outlet
15APWR OUTLETCigarette Lighter and Power Outlet
20AAIRBUSElectronic Modulated Air Suspension
20ATI&TEPower Tilt and Power Telescopic
30AD P/SEATPower Seat (Driver's Seat)

Fig. 8: Identifying Passenger Side Junction Block Components (Relays)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Passenger Side Junction Block Fuses