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Home >> Lexus >> 2025 >> NX 350h >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Battery System - Diagnostic Codes (2 Of 2) & Circuit Tests >> Hybrid Battery System >> DTC U1150-87: Lost Communication with Hybrid Powertrain Control Module (Hybrid/EV Battery Local Bus) Missing Message [11/2021 - ] >> Procedure

DTC U1150-87: Lost Communication with Hybrid Powertrain Control Module (Hybrid/EV Battery Local Bus) Missing Message [11/2021 - ]: Procedure

  1. CHECK DTC OUTPUT (HYBRID CONTROL) 
    1. Check and record any Hybrid Control DTCs and freeze frame data. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      DTCs related to Hybrid Control System are not output. A
      DTCs related to Hybrid Control System are output. B
    2. Turn the ignition switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2021 - 03/2024]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [03/2024 - ] 

    Result: 

    A 

    See step  2

  2. CHECK HYBRID VEHICLE CONTROL ECU (VOLTAGE) 
    1. Turn the ignition switch to ON.
    2. Measure the voltage according to the value(s) in the table below.
      GTY1076246Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU)      		 - -

      Standard Voltage

      Tester Connection Condition Specified Condition
      D67-7 (+B1) - Body ground Ignition switch ON 11 to 14 V
      D67-8 (+B2) - Body ground Ignition switch ON 11 to 14 V
    3. Turn the ignition switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY ECU ASSEMBLY POWER SOURCE CIRCUIT) 

    Result: 

    OK 

    See step  3

  3. CHECK HYBRID VEHICLE CONTROL ECU 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair information because this may cause a malfunction.

    2. Disconnect the battery ECU assembly connector.
      GTY1066386Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      z14-25 (CA1H) - z14-26 (CA1L) Ignition switch off 108 to 132 Ω
      GTY1052359Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery ECU Assembly)
    4. Reconnect the battery ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BATTERY ECU ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair information because this may cause a malfunction.

    2. Disconnect the hybrid vehicle control ECU connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

    3. Disconnect the D39 transmission floor shift assembly (shift control ECU) connector.
    4. Disconnect the B77 shift control actuator assembly (shift actuator ECU) connector.
    5. Disconnect the D2 radio and display receiver assembly connector.
    6. Disconnect the d1 mobile wireless charger cradle assembly connector. (w/ Wireless Charger System)
    7. Disconnect the D22 combination meter assembly connector. (w/o Headup Display)
    8. Disconnect the battery ECU assembly connector.
      GTY1066386Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Before disconnecting the connector, check that it is not loose or disconnected.
      • Check the terminals of the connector for deformation and corrosion.
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      z14-25 (CA1H) - D67-10 (CA4H) Ignition switch off Below 1 Ω
      z14-26 (CA1L) - D67-23 (CA4L) Ignition switch off Below 1 Ω
      z14-25 (CA1H) - Other terminals and body ground Ignition switch off 10 kΩ or higher
      z14-26 (CA1L) - Other terminals and body ground Ignition switch off 10 kΩ or higher
    10. Reconnect the battery ECU assembly connector.
    11. Reconnect the combination meter assembly connector. (w/o Headup Display)
    12. Reconnect the mobile wireless charger cradle assembly connector. (w/ Wireless Charger System)
    13. Reconnect the radio and display receiver assembly connector.
    14. Reconnect the shift control actuator assembly (shift actuator ECU) connector.
    15. Reconnect the transmission floor shift assembly (shift control ECU) connector.
    16. Reconnect the hybrid vehicle control ECU connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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