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Home >> Lexus >> 2023 >> NX 350 Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System - Circuit Tests (1 Of 9) & Diagnostic Codes >> CAN COMMUNICATION SYSTEM (for Gasoline Model) >> DTC U115C-87: Lost Communication with ECM/PCM "A" (ch5) Missing Message; DTC U0122: Lost Communication With Vehicle Dynamics Control Module; DTC U1170-87: Lost Communication with Brake System Control Module (ch2) Missing Message [11/2021 - 03/2023] >> Caution / Notice / Hint
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Caution / Notice / Hint

WARNING:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

NOTE:
  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - ]

  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
  • To prevent the key from being locked in the vehicle, make sure to enter e-latch inspection mode and enable the manual release handle before disconnecting the cable from the negative (-) battery terminal.

    Refer to INSPECTION MODE PROCEDURE [11/2021 - ]

  • After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) battery terminal.

    Refer to BEFORE DISCONNECTING BATTERY [11/2021 - ]

  • When disconnecting and reconnecting the battery.

    HINT: 

    When disconnecting and reconnecting the battery, there is an automatic learning function that completes learning when the respective system is used.

    Refer to AUTOMATIC LEARNING CHART [11/2021 - ]

  • Some parts must be initialized and set when replacing or removing and installing parts.

    Refer to WORK PROCEDURE [11/2021 - 03/2023]

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the ignition switch to ON and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.

    Refer to DIAGNOSIS SYSTEM [11/2021 - 03/2023]

HINT: 

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