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 Toyota Sienna LEFACTORY OEM SERVICE PROCEDURE
Body Control Systems
- Description & Operation
- Component Locations
- Programming
- Trouble Shooting
- System Tests
- Notes
- Test No. 1: Ignition Switch Does Not Operate In Each Position
- Test No. 2: Key Unlock Warning System Buzzer Inoperative
- Test No. 3: Key Unlock Warning System Buzzer Sounds Improperly
- Test No. 4: Automatic Light Control System Does Not Operate
- Test No. 5: Headlight Does Not Operate
- Test No. 6: Low Beam Headlight Or High Beam Headlight Does Not Operate, Or Flash High Beam Headlight Feature Does Not Operate
- Test No. 7: Headlight Does Not Operate With Engine Running & Headlight Switch In Off Position
- Test No. 8: Taillight Does Not Operate
- Test No. 9: Automatic Turn Off System Does Not Operate
- Test No. 10: Only One Interior Light Does Not Operate
- Test No. 11: All Interior Lights Do Not Operate
- Test No. 12: Illuminated Entry System Does Not Operate
- Test No. 13: Front Interior Light At Front Of Headliner Does Not Operate
- Test No. 14: Interior Light No. 1 At Center Of Headliner Does Not Operate
- Test No. 15: Vanity Light Does Not Operate
- Test No. 16: Interior Light No. 2 At Rear Of Headliner Does Not Operate
- Test No. 17: Driver's Seat Belt Warning Light On Instrument Cluster Does Not Operate
- Test No. 18: Passenger's Seat Belt Warning Light On Clock Assembly Does Not Operate
- Test No. 19: Open Door Warning Light Does Not Operate
- Test No. 20: Power Door Lock System Does Not Operate On Any Door
- Test No. 21: Power Door Lock System Does Not Operate When Using Manual Switch
- Test No. 22: Power Door Lock System Does Not Operate When Using The Key
- Test No. 23: Two-Operation Unlock Function Does Not Operate
- Test No. 24: Only One Power Door Lock Does Not Operate
- Test No. 25: Key Confinement Prevention Function Does Not Operate
- Test No. 26: Auto Lock/Unlock System Does Not Operate
- Test No. 27: All Functions Of Keyless Entry System Will Not Operate
- Test No. 28: Lock Or Unlock Function Does Not Operate
- Test No. 29: Automatic Lock Function Operates Even If Door Is Opened Within 30 Seconds After All Doors Are Unlocked Using Keyless Entry System
- Test No. 30: Keyless Entry System Operates But Buzzer Will Not Sound
- Test No. 31: Buzzer Sounds But Keyless Entry System Will Not Operate
- Test No. 32: Horn Does Not Operate Or Horn Operates Improperly
- Component Tests
- Buzzer For Keyless Entry System
- Daytime Running Light Relay
- Daytime Running Light Relay (Main)
- Door Courtesy Switch
- Door Key Lock & Unlock Switch
- Door Lock Motor
- Door Unlock Detection Switch
- Front Interior Light
- Headlight Control Switch
- Headlight Dimmer Relay
- Headlight Relay
- Ignition Switch
- Interior Light No. 1
- Interior Light No. 2
- Key Unlock Warning Switch
- Power Relay
- Seat Belt Buckle Switch
- Seat Belt Warning Occupant Detection Sensor
- Taillight Relay
- Vanity Light
- Pin Voltage Tests
- Removal & Installation
- Wiring Diagrams
Factory Service Tools
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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.
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