2004 Toyota Sienna CEFACTORY OEM SERVICE PROCEDURE

Problem Symptoms Table

PROBLEM SYMPTOMS

Symptom Suspect Area
All Power Windows Do Not Operate 1. PWR Fuse
2. POWER WINDOW RELAY (MARKING: P/W) 
3. IGNITION SWITCH
4. POWER WINDOW REGULATOR MASTER SWITCH 
5. POWER WINDOW REGULATOR MOTOR ASSY 
6. Wire Harness
Only One Power Window Does Not Operate 1. POWER WINDOW REGULATOR MASTER SWITCH 
2. POWER WINDOW REGULATOR SWITCH 
3. POWER WINDOW REGULATOR MOTOR ASSY 
4. Wire Harness
AUTO DOWN Function Does Not Operate 1. POWER WINDOW REGULATOR MASTER SWITCH 
2. POWER WINDOW REGULATOR MOTOR ASSY 
Window Lock System Does Not Operate 1. POWER WINDOW REGULATOR MASTER SWITCH 
Window Cannot Be Operated After Ignition Switch OFF 1. FRONT DOOR COURTESY LAMP SWITCH ASSY 
2. BODY MULTIPLEX COMMUNICATION SYSTEM
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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