2008 Lexus IS FFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

NOTE:
  • When the multiplex network master switch assembly connector or multiplex network switch assembly (applicable location) connector is disconnected, the power window control system must be initialized (See CUSTOMIZE PARAMETERS  ).
  • Since the power window control system has functions that use multiplex communication (BEAN), first confirm that there is no malfunction in the multiplex communication system by inspecting the multiplex communication functions in accordance with the How to Proceed with Troubleshooting procedure (See HOW TO PROCEED WITH TROUBLESHOOTING  ). Then, conduct the following inspection procedure.
  1. PERFORM INITIALIZATION (POWER WINDOW CONTROL SYSTEM (APPLICABLE LOCATION)) 
    1. Initialize the power window control system (applicable location) (See CUSTOMIZE PARAMETERS  )
  2. CHECK JAM PROTECTION FUNCTION OPERATING RANGE 
    1. Check if the jam protection function operates normally for the applicable power window

      HINT.

      The jam protection function will not operate within 4 mm (0 157 in) of the fully closed position

      OK: Jam protection function operates normally. 

      Result 

      RESULT REFERENCE

      Result Proceed to
      NG (Driver side window) A
      NG (Front passenger side window) B
      NG (Rear LH side window) C
      NG (Rear RH side window) D
      OK E

    A: REPLACE MULTIPLEX NETWORK MASTER SWITCH  (See REMOVAL  )

    B: REPLACE MULTIPLEX NETWORK SWITCH ASSEMBLY (for Front Passenger Side)  (See REMOVAL  )

    C: REPLACE MULTIPLEX NETWORK SWITCH ASSEMBLY (for Rear LH Side)  (See REMOVAL  )

    D: REPLACE MULTIPLEX NETWORK SWITCH ASSEMBLY (for Rear RH Side)  (See REMOVAL  )

    E: END (INITIALIZATION IS DEFECTIVE) 

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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