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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 234 (Can Communication System (Hybrid) - Circuit Tests (1 Of 4) & Diagnostic Codes) >> CAN COMMUNICATION SYSTEM (for HV Model) >> Driver Seat Control ECU Communication Stop Mode [06/2018 - 08/2021] >> Procedure

Driver Seat Control ECU Communication Stop Mode [06/2018 - 08/2021]: Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR OPEN IN CAN BUS LINES (POSITION CONTROL ECU ASSEMBLY LH BRANCH LINE) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the U48 position control ECU assembly LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      U48-13 (CANP) - U48-14 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      GTY809154Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Position Control ECU Assembly LH)

      Result

      Result 
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (POSITION CONTROL ECU ASSEMBLY LH) 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Disconnect the U46 position control ECU assembly LH connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      U46-2 (GND) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      GTY832707Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Position Control ECU Assembly LH)
    3. Reconnect the cable to the negative (-) auxiliary battery terminal.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      U46-3 (+B) - Body ground Power switch off 11 to 14 V
      U48-1 (IG) - Body ground Power switch on (IG) 11 to 14 V
      U48-15 (SYSB) - Body ground Power switch off 11 to 14 V

      Result

      Result 
      OK
      NG

    Result: 

    OK 

    REPLACE POSITION CONTROL ECU ASSEMBLY LH 

    1. Refer to REMOVAL [06/2018 - 08/2021] (for TMC Made)
    2. Refer to REMOVAL [06/2018 - 08/2021] (for TMMK Made)

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

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