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Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 72 (Smart Access System (For Start) - Symptom Tests) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, Gasoline Model) >> DTC U0100-87: Lost Communication With ECM/PCM "A" Missing Message; DTC U0103-87: Lost Communication with Gear Shift Control Module "A" Missing Message; DTC U0129-87: Lost Communication with Brake System Control Module "A" Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0155-87: Lost Communication with Instrument Panel Cluster (IPC) Control Module; DTC U0163-87: Lost Communication with Navigation Control Module Missing Message; DTC U0230-87: Lost Communication with Rear Gate Module Missing Message; DTC U1103-87: Lost Communication with Stop and Start Control Module Missing Message; DTC U1110-87: Lost Communication with Intuitive Parking Assist Module Missing Message; DTC U1117-87: Lost Communication with Accessory Gateway Missing Message [10/2022 - ] >> Procedure

DTC U0100-87: Lost Communication With ECM/PCM "A" Missing Message; DTC U0103-87: Lost Communication with Gear Shift Control Module "A" Missing Message; DTC U0129-87: Lost Communication with Brake System Control Module "A" Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0155-87: Lost Communication with Instrument Panel Cluster (IPC) Control Module; DTC U0163-87: Lost Communication with Navigation Control Module Missing Message; DTC U0230-87: Lost Communication with Rear Gate Module Missing Message; DTC U1103-87: Lost Communication with Stop and Start Control Module Missing Message; DTC U1110-87: Lost Communication with Intuitive Parking Assist Module Missing Message; DTC U1117-87: Lost Communication with Accessory Gateway Missing Message [10/2022 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR DTC 
    1. Check for DTCs and note any DTCs that are output.

      Result

      Result Proceed to
      U0100-87, U0103-87, U0129-87, U0140-87, U0155-87, U0163-87, U0230-87, U1103-87, U1110-87 or U1117-87 is output A
      DTCs other than U0100-87, U0103-87, U0129-87, U0140-87, U0155-87, U0163-87, U0230-87, U1103-87, U1110-87 and U1117-87 are output B

    Result: 

    B 

    GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2022 - ] 

    Result: 

    A 

    See step  2

  2. CLEAR DTC 
    1. Clear the DTCs.

      Result

      Proceed to
      NEXT
    2. Turn the ignition switch off.

    Result: 

    NEXT 

    See step  3

  3. CHECK FOR DTC 
    1. Turn the ignition switch to ON and wait for 10 seconds or more.
    2. Check for DTCs and note any DTCs that are output.

      Result

      Result Proceed to
      U0100-87, U0103-87, U0129-87, U0140-87, U0155-87, U0163-87, U0230-87, U1103-87, U1110-87 or U1117-87 is output A
      U0100-87, U0103-87, U0129-87, U0140-87, U0155-87, U0163-87, U0230-87, U1103-87, U1110-87 and U1117-87 are not output B

    Result: 

    A 

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 08/2023]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2023 - ] 

    Result: 

    B 

    GO TO CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [10/2022 - ] 

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