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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) >> All Door Entry Lock/Unlock Functions and Wireless 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".
  • Check that there are no door control transmitters in the vehicle.
  • Before performing the inspection, check that DTC B1242 is not output (See DTC B1242 WIRELESS DOOR LOCK TUNER CIRCUIT MALFUNCTION ).
  1. CHECK POWER DOOR LOCK CONTROL SYSTEM 
    1. When the master switch door control switch is operated, check that the locked doors unlock (See OPERATION CHECK ).

      OK: Locked doors unlock. 

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

    OK: Go to next step 

  2. CHECK DOOR CONTROL TRANSMITTER 
    1. When another registered door control transmitter is used, check that the wireless and entry function operates normally (See OPERATION CHECK  ).

      Result 

      RESULT CHART

      Result Proceed to
      Entry function operates and door control transmitter that did not operate is electrical key transmitter A
      Entry function operates and door control transmitter that did not operate is card key(1) B
      Entry function does not operate C
      (1) for Card Type

    B:  Go to step  5

    C:  Go to step  6

    A: Go to next step 

  3. CHECK DOOR CONTROL TRANSMITTER (LED) 
    1. Check that the transmitter LED illuminates 3 times when a switch is pressed 3 times.

      Result 

      RESULT CHART

      Result Proceed to
      Transmitter LED does not illuminate 3 times when switch is pressed 3 times A
      Transmitter LED illuminates 3 times when switch is pressed 3 times B
      Transmitter LED does not illuminate second or third time C

      HINT:

      If the transmitter LED does not illuminate the second or third time, replace the transmitter battery as it is depleted.

    B: REPLACE DOOR CONTROL TRANSMITTER 

    C: REPLACE TRANSMITTER BATTERY  (See TRANSMITTER BATTERY )

    A: Go to next step 

  4. INSPECT TRANSMITTER BATTERY (VOLTAGE) 
    1. Electrical Key Transmitter
      1. Remove the battery from the electrical key transmitter that does not operate. Attach a lead wire (0.6 mm (0.0236 in.) or less in diameter including wire sheath) with tape or equivalent to the negative terminal (See TRANSMITTER BATTERY ).
        NOTE: Do not wrap the lead wire around a terminal, wedge it between terminals, or solder it. A terminal may be deformed or damaged, and the battery will not be able to be installed correctly.
      2. Carefully pull the lead wire out from the position shown in the illustration and install the previously removed transmitter battery.
        Fig 1: Identifying Lead Wire
        G05754246Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Using an oscilloscope, check the transmitter battery voltage.

        HINT:

        When measuring the battery voltage, while operating the lock switch of a door handle, bring the electrical key transmitter within the entry operating range to perform the measurement. For the entry operating range, refer to SYSTEM DESCRIPTION  .

        Standard Voltage 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Tool Setting Condition Specified Condition
        Battery positive (+) - Battery negative (-) 0 5V/DIV., 100 ms/DIV Engine switch off, all doors closed and lock switch pushed 2.5 to 3.2 V (Refer to the  awaveform)

    NG: REPLACE TRANSMITTER BATTERY  (See TRANSMITTER BATTERY )

    Fig 2: Checking Transmitter Battery Voltage
    G05763661Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE DOOR CONTROL TRANSMITTER 

  5. INSPECT CARD KEY BATTERY (VOLTAGE) 
    1. Card Type Key:
      1. Remove the battery from the card key that does not operate. Attach a lead wire to the negative and positive side of the battery with tape or equivalent (See TRANSMITTER BATTERY ).
        NOTE: Do not wrap the lead wire around a terminal, wedge it between the terminals, or solder it. A terminal may be deformed or damaged, and the battery will not be able to be installed correctly.
      2. Using an oscilloscope, check the transmitter battery voltage.

        HINT:

        When measuring the battery voltage, while operating the lock switch of a door handle, bring the card key within the entry operating range to perform the measurement. For the entry operating range, refer to SYSTEM DESCRIPTION  .

        Standard Voltage 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Tool Setting Condition Specified Condition
        Battery positive (+) - Battery negative (-) 0.5V/DIV., 100 ms/DIV. Engine switch off, all doors closed and lock switch pushed 2.5 to 3.2 V (Refer to the  awaveform)
        NOTE: Before measuring the battery voltage, make sure that the positive side of the battery is set towards the LEXUS mark side.
      Fig 3: Checking Transmitter Battery Voltage - Card Type Key
      G05763662Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE CARD KEY BATTERY  (See TRANSMITTER BATTERY )

    OK: REPLACE CARD KEY 

  6. CHECK WAVE ENVIRONMENT 
    1. Bring the door control transmitter near the door control receiver, and perform a wireless and entry function operation check.

      HINT:

      • When the door control transmitter is brought near the door control receiver, the possibility of wave interference decreases, and it can be determined if wave interference is causing the problem symptom.
      • If the inspection result is that the problem only occurs in certain locations or times of day, the possibility of wave interference is high. Also, added vehicle components may cause wave interference. If installed, remove them and perform the operation check.

      OK: Wireless and entry functions operate normally. 

    NG: Go to step 7 

    OK: AFFECTED BY WAVE INTERFERENCE 

  7. INSPECT FUSE (IMB) 
    1. Remove the IMB fuse from the engine room relay block.
    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
      IMB fuse Always Below 1 Ω

    NG: REPLACE FUSE 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - BATTERY) 
    1. Disconnect the E29 ECU connector.
    2. Measure the resistance and voltage according to the value(s) in the tables below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      E29-17 (E) - Body ground Always Below 1 Ω

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      E29-1 (+B) - Body ground Always 11 to 14 V
      Fig 4: Identifying E29 ECU Connector
      G05630864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - DOOR CONTROL RECEIVER AND BODY GROUND) 
    Fig 5: Identifying Smart Key ECU Assembly Connector Terminal E29 And Door Control Receiver L21
    G05630865Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the L21 receiver connector.
    2. Disconnect the E29 ECU 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
      E29-29 (RCO) - L21-4 (+5) Always Below 1 Ω
      E29-38 (RDA) - L21-5 (DATA) Always Below 1 Ω
      E29-39 (RSSI) - L21-2 (RSSI) Always Below 1 Ω
      E29-17 (E) - Body ground Always Below 1 Ω
      L21-1 (GND) - Body ground Always Below 1 Ω
      E29-29 (RCO) or L21-4 (+5) - Body ground Always 10 kΩ or higher
      E29-38 (RDA) or L21-5 (DATA) - Body ground Always 10 kΩ or higher
      E29-39 (RSSI) or L21-2 (RSSI) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  10. CHECK DOOR CONTROL RECEIVER OPERATION 
    1. Temporarily replace the door control receiver with a new one (See REMOVAL )
    2. Check that the wireless and entry functions operate normally.

      OK: Wireless and entry functions operate normally. 

    NG: REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)  (See REMOVAL  )

    OK: END (DOOR CONTROL RECEIVER IS DEFECTIVE) 

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