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Home >> Lexus >> 2008 >> LX 570 >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Theft Deterrent / Keyless Entry >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) >> Back Door Entry Lock and Unlock Functions do not Operate >> Inspection Procedure

Inspection Procedure

NOTE: Before performing the inspection, check that there are no problems related to the "CAN Communication System" and "LIN Communication System".
  1. CHECK POWER DOOR LOCK OPERATION 
    1. When the door control switch of the master switch assembly is operated, check that the locked doors unlock.

      OK: Door locks operate normally. 

    NG: GO TO POWER DOOR LOCK CONTROL SYSTEM  (See PROBLEM SYMPTOMS TABLE )

    OK: Go to next step 

  2. CHECK VEHICLE EQUIPMENT 
    1. Check if the power back door is equipped on the vehicle.

      Result 

      RESULT CHART

      Result Proceed to
      w/ Power Back Door System A
      w/o Power Back Door System B

    B:  Go to step  4

    A: Go to next step 

  3. CHECK POWER BACK DOOR OPERATION 
    1. When the power back door switch is operated, check that the power back door open and close.

      OK: Power back door is open and close. 

    NG: GO TO POWER BACK DOOR SYSTEM  (See INITIALIZATION )

    OK: Go to next step 

  4. READ VALUE USING TECHSTREAM (BACK DOOR LOCK SWITCH, BACK DOOR OPENER SWITCH) 
    1. Using the Techstream, read the Data List.

      Main Body 

      DIAGNOSTIC NOTE NORMAL CONDITION CHART

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Back Door Handle SW Back door opener switch / ON or OFF ON: Back door opener switch pushed
      OFF: Back door opener switch not pushed
      -

      Smart Access 

      DIAGNOSTIC NOTE NORMAL CONDITION CHART

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Tr/B-Door Lock SW Back door lock switch / ON or OFF ON: Back door lock switch pushed
      OFF: Back door lock switch not pushed
      -

      OK: "ON" (switch is pushed) and "OFF" (switch is not pushed) appears on the screen. 

    NG:  Go to step  8

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - OUTSIDE ELECTRICAL KEY ANTENNA) 
    1. Disconnect the E29 ECU connector.
    2. Disconnect the K23 antenna connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      E29-31 (CLG8) - K23-1 (CLG5) Always Below 1 Ω
      E29-32 (CG8B) - K23-2 (CLGB) Always Below 1 Ω
      E29-31 (CLG8) - Body ground Always 10 kΩ or higher
      E29-32 (CG8B) - Body ground Always 10 kΩ or higher
      Fig 1: Identifying E29 ECU Connector And K23 Antenna Connector
      G05630946Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. REPLACE ELECTRICAL KEY ANTENNA (for Outside Luggage Compartment) 
    1. Replace the electrical key antenna (for outside luggage compartment) (See REMOVAL  )
  7. CHECK ELECTRICAL KEY ANTENNA (for Outside Luggage Compartment) OPERATION 
    1. Check that the entry functions operate normally

      OK: Entry functions operate normally. 

    NG: REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

    OK: END (ELECTRICAL KEY ANTENNA [for Outside Luggage Compartment] IS DEFECTIVE) 

  8. CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH - BODY GROUND) 
    1. Disconnect the S7 switch connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      S7-2 (L) - Body ground Always Below 1 Ω
      Fig 2: Identifying S7 Switch Connector
      G05630947Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE BACK DOOR OPENER SWITCH  (See BACK DOOR OPENER SWITCH )