Sienna 1998-1999

Window Systems

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Power Windows



Diagnosis & Testing

Specific to:

Toyota Sienna 1998-2005

Refer to the Electrical Wiring Diagram for component and connector locations, connector views, and circuit-specific information.

Many intermittent open or short circuits may be caused by wiring harness and connector movement due to vibration, bumps and rough pavement, etc.

  1. Test the wiring harness and connectors by performing the following tests:

    Move the related connectors and wiring while monitoring the component.
     
    Move the related connectors and wiring with the component in the ON and OFF position.
     
    As appropriate, using a suitable the scan tool, observe the component operation.
     
    If harness or connector movement affects the component and system operation, inspect and repair the harness or connections as necessary.
     

  2.  
  3. Test the connector terminal pins and/or wiring by performing the following tests:

    Inspect for incorrect mating of the connector halves, or terminals not fully seated in the connector body.
     
    Inspect for improperly formed or damaged terminals and test for incorrect terminal tension.
     
    Inspect for poor terminal to wire connections including terminals crimped over insulation. This requires removing the terminal from the connector body.
     
    Inspect for corrosion or water intrusion. Pierced or damaged insulation can allow moisture to enter the wiring. The conductor can corrode inside the insulation with little visible evidence. Look for swollen and/or brittle sections of wire in the suspect circuits.
     
    Inspect for wires that are broken inside the insulation by gently pulling on suspect sections of wiring.
     

  4.  
  5. Test the wiring harness and connectors by performing the following tests:

    Check for battery voltage at the lead wire of connection to the switch. If battery voltage is absent, check the fuse. If battery voltage is present, check through the switch for power delivery.
     
    Check for battery voltage at the motor. If battery voltage is absent, check wiring. If battery voltage is present, the motor may be faulty.
     

  6.  

Specific to:

Toyota Sienna 1998-2003



Click image to see an enlarged view

Fig. Power window master switch testing



Click image to see an enlarged view

Fig. Power window passenger switch testing



Click image to see an enlarged view

Fig. Power window motor testing

Specific to:

Toyota Sienna 1998-2005

Refer to the Electrical Wiring Diagram for component and connector locations, connector views, and circuit-specific information.

Many intermittent open or short circuits may be caused by wiring harness and connector movement due to vibration, bumps and rough pavement, etc.

  1. Test the wiring harness and connectors by performing the following tests:

    Move the related connectors and wiring while monitoring the component.
     
    Move the related connectors and wiring with the component in the ON and OFF position.
     
    As appropriate, using a suitable the scan tool, observe the component operation.
     
    If harness or connector movement affects the component and system operation, inspect and repair the harness or connections as necessary.
     

  2.  
  3. Test the connector terminal pins and/or wiring by performing the following tests:

    Inspect for incorrect mating of the connector halves, or terminals not fully seated in the connector body.
     
    Inspect for improperly formed or damaged terminals and test for incorrect terminal tension.
     
    Inspect for poor terminal to wire connections including terminals crimped over insulation. This requires removing the terminal from the connector body.
     
    Inspect for corrosion or water intrusion. Pierced or damaged insulation can allow moisture to enter the wiring. The conductor can corrode inside the insulation with little visible evidence. Look for swollen and/or brittle sections of wire in the suspect circuits.
     
    Inspect for wires that are broken inside the insulation by gently pulling on suspect sections of wiring.
     

  4.  
  5. Test the wiring harness and connectors by performing the following tests:

    Check for battery voltage at the lead wire of connection to the switch. If battery voltage is absent, check the fuse. If battery voltage is present, check through the switch for power delivery.
     
    Check for battery voltage at the motor. If battery voltage is absent, check wiring. If battery voltage is present, the motor may be faulty.
     

  6.  

 
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