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2003 Lexus RX300 CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT Lexus REPAIR SHOPS DON'T WANT YOU TO KNOW
Learn how to repair a car or truck, install or remove parts, wire an engine, reset warning lights, replace fuel filter, fix auto body and more. Get Automotix DIY!Select Section
- Component Locations
- Wiring Diagrams
- Technical Service Bulletins
- Specifications
- A/C & Heater Service
- Brake Service
- Fuel Filter Replacement
- Driveline, U-Joint & CV Axles Replacement
- Starter & Alternator Replacement
- Cabin Air Filter Locations & Replacement
- Maintenance Lamp Reset
- Radiator & Hose Replacement
- Serpentine Belt Service
Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 2003 Lexus RX300 car and truck
repair procedures including Lexus engine diagrams, wiring diagrams, repair work estimating measures, technical service bulletins, auto body work
guidance, starter & alternator replacement procedures, serpentine belt replacement procedures, radiator & hose replacement procedures, tune-up &
drivability specifications, quick lube illustrations, preventive maintenance guide, engine light reset instructions, parts removal and install
procedures, fuel filter replacement directions, component location diagrams, air filter locations & replacement instructions, a/c
system specifications, and general auto service procedures. You don't have to be a car mechanic or technician to know how to fix
your Lexus RX300 automobile. Try the Automotix DIY solution today!
A/C & HEATER SERVICE PROCEDURES FOR 2003 Lexus RX300 AUTOMOBILES
Lexus -> Electric Cooling Fans -> Component Diagnosis & Testing -> Cooling Fan -> Cooling Fan Computer Wire Harness -> Cooling Fan ECU -> Cooling Fan Main Relay -> Cooling Fan Motor -> Cooling Fan Operation -> Cooling Fan Relay No. 2 -> Cooling Fan Relay No. 3 -> Cooling Fans -> Engine Coolant Temperature Switch -> ES 300 -> ES 330 -> Fan Main Relay -> Fan Motor -> GS 300 & GS 430 -> IS 300 -> LS 430 & SC 430 -> LX 470 -> No. 1 & No. 3 Cooling Fan Relay -> No. 1 Cooling Fan Relay -> No. 1 Engine Coolant Temperature (ECT) Switch -> No. 2 Cooling Fan Relay -> No. 2 Engine Coolant Temperature (ECT) Switch -> No. 3 Cooling Fan Relay -> No.2 Engine Coolant Temperature (ECT) Switch -> On Vehicle Inspection -> On-Vehicle Inspection -> Radiator Fan Main Relay -> RX 300 -> RX 330 -> Temperature Switch
Vehicle: 2003 Lexus RX300 3.0 V6 GAS
ES 300
Refer to "Camry" in in "Toyota" for service procedures.
ES 330
On-Vehicle Inspection
- With coolant temperature below 83°C (181°F), turn ignition On and ensure fan stops. If fan does not stop, proceed to next step. If fan stops, inspect cooling fan.
- Inspect fan relays.
- Disconnect No. 1 Engine Coolant Temperature (ECT) switch connector.
- Connect terminals of No. 1 ECT switch connector using a suitable jumper wire. If fan rotates at high speed, proceed to next step. If fan does not rotate, inspect cooling fan main...
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BRAKE SERVICE PROCEDURES FOR 2003 Lexus RX300 AUTOMOBILES
Lexus -> Power Brake Units -> Diagnosis & Testing -> Air Tightness Inspection -> Brake Booster Operational Test -> Brake Pedal Reserve Distance Inspection -> Except LX470 -> Operating inspection
Vehicle: 2003 Lexus RX300 3.0 V6 GAS
Brake Pedal Reserve Distance Inspection
Except LX470
- Release parking brake.
- With engine running, depress brake pedal and measure pedal reserve distance, Fig. .
- On LS430 models, reserve height should be more than 2.36 inches at 110.2 ft. lbs. of pressure.
- On IS300 models, reserve height should be more than 3.90 inches at 110.2 ft. lbs. of pressure.
- On RX300 models, reserve height should be more than 4.80 inches at 110.2 ft. lbs. of pressure.
- On SC430 models, reserve height should be more than 3.94 inches at 44.1 ft. lbs. of pressure.
Brake Booster Operational Test
Operating inspection
- ...
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FUEL FILTER REPLACEMENT PROCEDURES FOR 2003 Lexus RX300 AUTOMOBILES
Lexus -> Fuel Filter Scheduled Maintenance -> -> Normal Service -> Severe Service
Vehicle: 2003 Lexus RX300 3.0 V6 GAS
Normal Service
Manufacturer does not specify service interval
...
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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 2003 Lexus RX300 AUTOMOBILES
CV AXLE SHAFT, Replace -> Front
Vehicle: 2003 Lexus RX300 3.0 V6 GAS
Front
- Raise and support vehicle and support it with safety stands in proper locations.
- Remove wheel nuts and front wheels.
- Remove drain plug from transaxle and drain transaxle fluid.
- Remove front fender apron seal bolts.
- Remove bolt securing speed sensor.
- Remove split pin and driveshaft castle nut and washer from front hub.
- Apply brake and remove lefthand axle hub nut.
- Remove lefthand front stabilizer nut and separate link assembly. If ball joint turns together with nut use suitable tool to hold stud.
- Disconnect lefthand speed sensor harness clip and separate sensor wire and hose ...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 2003 Lexus RX300 AUTOMOBILES
Alternator, Replace
Vehicle: 2003 Lexus RX300 3.0 V6 GAS
- Disconnect battery ground cable.
- Loosen pivot bolt, adjusting lock bolt, and adjusting bolt, and remove drive belt.
- Disconnect alternator connector.
- Remove nut, and disconnect alternator wire.
- Disconnect wire harness from clip.
- Remove pivot bolt, plate w...
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CABIN AIR FILTER LOCATIONS & REPLACEMENT PROCEDURES FOR 2003 Lexus RX300 AUTOMOBILES
Cabin Air Filter Service -> Lexus -> 1996-2000 LS400 & 1999-2003 RX300
Vehicle: 2003 Lexus RX300 3.0 V6 GAS
The cabin air filter should be replaced every 15,000 miles or 12 months. The filter should be replaced more often if air flow is less than normal.
- Open the glove compartment.
- Remove the cover from the rear of the glove compartment.
- Through the glove compartment cover opening, disengage the filter cover retainers, then remove the cover and th...
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MAINTENANCE LAMP RESET PROCEDURES FOR 2003 Lexus RX300 AUTOMOBILES
Lexus -> Automatic Transmission Oil Temperature Warning Lamp ->
Vehicle: 2003 Lexus RX300 3.0 V6 GAS
This lamp will be illuminated when automatic transmission or transfer case fluid temperature exceeds 302°F. If the lamp lights, allow vehicle to operate at idle speed until fluid temperature falls below 248°F; t...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 2003 Lexus RX300 AUTOMOBILES
Radiator, Replace
Vehicle: 2003 Lexus RX300 3.0 V6 GAS
- Raise and support vehicle.
- Remove engine under cover and drain engine coolant.
- Recover A/C refrigerant.
- Remove upper seal from top of radiator assembly.
- Disconnect discharge hose and liquid tube from A/C condenser. Cap fittings to prevent contamination.
- Remove liquid tube clamp from condenser.
- Remove condenser attaching bolts, then the condenser.
- Disconnect cooling fan electrical connectors.
- Disconnect engine coolant temp...
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SERPENTINE BELT SERVICE PROCEDURES FOR 2003 Lexus RX300 AUTOMOBILES
Serpentine Drive Belt, Replace
Vehicle: 2003 Lexus RX300 3.0 V6 GAS
- Rotate or lift the belt tensioner arm, using a suitable tool to relieve tension from dr...
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COMPONENT LOCATION DIAGRAMS FOR 2003 Lexus RX300 AUTOMOBILES
Component location diagrams for most 2003 Lexus RX300 cars and light trucks sold in the U.S. from 1990+.
 Engine Immobilizer Components Diagram for 2003 Lexus RX300 3.0 V6 GASComponents on diagram: |
 Power Window Control Components Diagram for 2003 Lexus RX300 3.0 V6 GASComponents on diagram: |
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WIRING DIAGRAMS FOR 2003 Lexus RX300 AUTOMOBILES
OEM drawn wiring diagrams for most 2003 Lexus RX300 cars and light trucks sold in the U.S.
 2003 Lexus RX300 3.0 V6 GAS Wiring DiagramComponents on diagram: |
 2003 Lexus RX300 3.0 V6 GAS Wiring DiagramComponents on diagram: |
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TECHNICAL SERVICE BULLETINS FOR 2003 Lexus RX300 AUTOMOBILES
OEM TSB listings for most 2003 Lexus RX300 cars and light trucks sold in the U.S. from 1985+.
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Document: REPAIR MANUAL SUPPLEMENT: VEHICLE PULLING TO ONE SIDE - REVISED Vehicle: 2003 Lexus RX300 3.0 V6 GAS Symptoms: |
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Document: UPPER/LOWER WINDSHIELD TICK NOISE Vehicle: 2003 Lexus RX300 3.0 V6 GAS Symptoms: |
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COMPONENT/PARTS SPECIFICATIONS FOR 2003 Lexus RX300 AUTOMOBILES
BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 2003 Lexus RX300 cars and light trucks sold in the U.S. and Canada from 1970+.
- Brake caliper mounting bolt torque
- Brake drum runout, machining, & discard specs
- Minimum brake lining thickness.
- Brake rotor runout, parallelism, machining, discard, & finish specs
A/C SYSTEM SPECIFICATIONS: Air conditioning refrigerant capacity and type as well as lubricant capacity for most 2003 Lexus RX300 cars and light trucks sold in the U.S. and Canada from 1980+.
- Refrigerant capacity & type, compressor oil viscosity, total system oil capacity & compressor clutch gap
COOLING SYSTEM BLEED: Cooling system bleeder valve identification, bleeder type and bleed procedures for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1986+.
PREVENTIVE MAINTENANCE: Preventive maintenance recommendations and required services for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1980+. Includes severe and routine service schedules
QUICK-LUBE and ILLUSTRATIONS: Fluid recommendations, capacities, drain plug torques, tire data, and severe service recommended preventive maintenance schedules. Information covers most 2003 Lexus RX300 cars and light trucks sold in the U.S. and Canada from 1980+. Engine and chassis service images.
- Automatic transmission/transaxles capacities, lubricant recommendations
- Differential/final drive capacities, lube recommendations, grades, & viscosities
- Final drive fill & drain plug torques
- Number of lubrication fittings & plugs
- Power steering, brake, & clutch fluid recommendations
- Manual transmission/transaxle capacities, lube recommendations, grades, & viscosities
- Number of lubrication fittings & plugs
- Power steering, brake, & clutch fluid recommendations
- Engine oil capacities, API grade recommendations, SAE viscosity recommendations, drain plug torque
- Severe service maintenance & interval recommendations
- Tire sizes, wheel nut/bolt torque, pressures & rim sizes
- Transfer case capacities, lube recommendations, grades, & viscosities
TUNE-UP & DRIVEABILITY SPECIFICATIONS: Most tune-up specifications for most 2003 Lexus RX300 cars and light trucks sold in the U.S. and Canada from 1980+
- Airflow sensor electrical specifications
- Tensioning specifications for systems with automatic tensioners
- Barometric pressure sensor specs
- Battery group number and cranking performance
- Crankshaft & camshaft position sensor resistance
- Engine compression pressures
- Coolant temperature sensor specs
- Computer advance.
- Diesel fuel temperature sensor resistance.
- Distributor advance specifications
- Ignition pickup coil resistance
- Exhaust gas recirculation temperature sensor resistance
- Engine fastener torque values
- Firing order diagrams
- Fuel system pressures
- Generator (alternator) specs
- Intake air temperature sensor specs
- Ignition coil specifications
- Fuel injector resistance
- Engine idle speeds
- Knock sensor resistance
- Manifold absolute pressure sensor specs
- Mixture control solenoid resistance
- Voltage regulator specs
- Spark plug applications & gaps
- Starter motor electrical specs.
- Tensioning specifications for systems without automatic tensioners
- Throttle body temperature sensor resistance
- Ignition timing in degrees at rpm
- Transmission oil temperature sensor resistance
- Throttle position sensor specs
- Vacuum sensor valve specs
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