2005 Toyota Avalon XLSFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. CHECK MULTIPLEX NETWORK MASTER SWITCH ASSY 
    1. Remove the multiplex network master switch with connector still connected.
    2. Measure the voltage of the wire harness side connector.

      Standard: 

      SPECIFIED CONDITION

      Switch Condition Tester Connection Specified Condition
      I6-15 - Body ground Window lock switch is OFF --> ON 0 V --> 2 V or less
      Fig 1: Identifying Multiplex Network Master Switch
      G02975693Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSY 
    2. OK: Go to next step. 
  2. CHECK WIRE HARNESS (MULTIPLEX NETWORK MASTER SWITCH ASSY - MULTIPLEX NETWORK SWITCH ASSY) 
    1. Disconnect the I6 and H6 connectors.
    2. Measure the resistance of the wire harness side connector.

      Standard: 

      SPECIFIED CONDITION

      Switch Condition Tester Connection Specified Condition
      I6-15 - H6-11 Always Below 1 Ω
      I6-15 - Body ground Always 10 kΩ or higher
      Fig 2: Checking Wire Harness (Multiplex Network Master Switch Assy - Multiplex Network Switch Assy
      G02975694Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE   ) 
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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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