Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2001 Lexus GS 300FACTORY OEM SERVICE PROCEDURE
Body Control Systems
- Description & Operation
- Trouble Shooting
- System Tests
- Notes
- Test No. 1: Anti-Theft Horn Circuit
- Test No. 2: Anti-Theft Indicator Circuit
- Test No. 3: Clock Circuit
- Test No. 4: Driver's Door Courtesy Light & Courtesy Switch Circuit
- Test No. 5: Driver's Door Key Lock & Unlock Switch Circuit
- Test No. 6: Driver's Door Lock Motor Circuit
- Test No. 7: Driver's Door Unlock Detection Switch Circuit
- Test No. 8 : Driver's Seat Belt Buckle Switch Circuit
- Test No. 9 : Ecu Power Source Circuit No. 1
- Test No. 10 : Ecu Power Source Circuit No. 2
- Test No. 11: Engine Hood Courtesy Switch Circuit
- Test No. 12: Hazard Switch Circuit
- Test No. 13 : Headlight Control Switch Circuit
- Test No. 14: Headlight Relay Circuit
- Test No. 15 : Illumination Circuit
- Test No. 16 : Key Unlock Warning Switch Circuit
- Test No. 17 : Left Rear Door Courtesy Light & Courtesy Switch Circuit
- Test No. 18 : Left Rear Door Lock Motor Circuit
- Test No. 19: Left Rear Door Unlock Detection Switch Circuit
- Test No. 20 : Light Sensor Circuit
- Test No. 21: Luggage Compartment Door Courtesy Switch Circuit
- Test No. 22: Luggage Compartment Door Key Lock & Unlock Switch Circuit
- Test No. 23: Luggage Compartment Door Opener Motor Circuit
- Test No. 24: Luggage Compartment Door Opener Switch Circuit
- Test No. 25: Passenger's Door Courtesy Light & Courtesy Switch Circuit
- Test No. 26: Passenger's Door Key Lock & Unlock Switch Circuit
- Test No. 27: Passenger's Door Lock Control Switch Circuit
- Test No. 28: Passenger's Door Lock Motor Circuit
- Test No. 29: Passenger's Door Unlock Detection Switch Circuit
- Test No. 30: Passenger's Seat Belt Buckle Switch & Seat Belt Warning Occupant Detection Sensor Circuit
- Test No. 31: Rear Defogger Relay Circuit
- Test No. 32: Right Rear Door Courtesy Light & Courtesy Switch Circuit
- Test No. 33: Right Rear Door Lock Motor Circuit
- Test No. 34: Right Rear Door Unlock Detection Switch Circuit
- Test No. 35: Standard Horn Circuit
- Test No. 36: Taillight Relay Circuit
- Test No. 37: Wireless Door Lock Buzzer Circuit
- Test No. 38: Wireless Door Lock Tuner Circuit
- Component Tests
- Anti-Theft Horn
- Anti-Theft Indicator
- Body Control Ecu Pin Voltage Tests
- Clock
- Door Courtesy Light
- Door Courtesy Switch
- Door Key Lock & Unlock Switch
- Door Lock Control Switch
- Door Lock Motor
- Door Unlock Detection Switch
- Engine Hood Courtesy Switch
- Hazard Switch
- Headlight Relay
- Luggage Compartment Door Courtesy Switch
- Luggage Compartment Door Key Lock & Unlock Switch
- Luggage Compartment Door Opener Motor
- Luggage Compartment Door Opener Switch
- Seat Belt Buckle Switch
- Standard Horn
- Taillight Relay
- Warning Occupant Detection Sensor
- Wireless Door Lock Buzzer
- Wiring Diagrams
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.