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Home >> Lexus >> 2023 >> LS 500h >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System (W/O Advanced Park) - Diagnostic Codes (10 Of 10) & Circuit Tests (1 Of 2) >> HYBRID CONTROL SYSTEM (w/o Advanced Park) >> DTC U0111-87: Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message [10/2017 - 10/2020] >> Procedure

DTC U0111-87: Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message [10/2017 - 10/2020]: Procedure

  1. CHECK DTC OUTPUT (HV BATTERY) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / HV Battery / Trouble Codes.
    4. Check and record any HV system DTCs and freeze frame data. Check for DTCs.

      Powertrain > HV Battery > Trouble Codes 

      Result

      Result Proceed to
      DTCs related to HV Battery are not output. A
      DTCs related to HV Battery are output. B
    5. Turn the power switch off.

    Result: 

    B 

    GO TO DTC CHART (HV BATTERY). Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2017 - 09/2018]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2018 - 10/2020] 

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (AM, IGCT VOLTAGE) 
    WARNING:

    Be sure to wear insulated gloves.

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

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

    2. Remove the No. 4 hybrid battery intake duct.

      Refer to PROCEDURE - Step 54 [10/2017 - 09/2018] , or refer to PROCEDURE - Step 54 [09/2018 - 10/2020]

    3. Measure the voltage according to the value(s) in the table below.
      GTY821854Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 2 HV Battery Pack Wire Connector)

      Standard Voltage

      Tester Connection Condition Specified Condition
      Le1 -5 (AM) - Le1 -1 (GND) Power switch off 11 to 14 V
      Le1 -14 (IGCT) - Le1 -1 (GND) Power switch on (IG) 11 to 14 V
      NOTE:

      Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      HINT: 

      As there might be an intermittent malfunction in the battery ECU assembly power source circuit, inspect the following even if the measured voltage is as specified:

      • Installation condition of fuse(s) (before removing fuse(s)) (IGCT circuit)
      • Fuse condition (before and after removing fuse(s)) (IGCT circuit)
      • Connection condition of connectors (IGCT circuit)
      • Wire harness condition (IGCT circuit)
      • Wire harness condition (GND circuit)
    4. Turn the power switch off.
    5. Install the No. 4 hybrid battery intake duct.

      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 HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - NO. 2 HV BATTERY PACK WIRE CONNECTOR) 
    WARNING:

    Be sure to wear insulated gloves.

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

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

    2. Remove the No. 4 hybrid battery intake duct.

      Refer to PROCEDURE - Step 54 [10/2017 - 09/2018] , or refer to PROCEDURE - Step 54 [09/2018 - 10/2020]

    3. Disconnect the Le1 No. 2 HV battery pack wire connector.
      NOTE:
      • Before disconnecting the connector, check that it is not loose or disconnected.
      • Check the terminals of the connector for deformation and corrosion.
      GTY799782Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Le1 -4 (CA1H) - Le1 -13 (CA1L) Power switch off 108 to 132 Ω
      GTY782988Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (No. 2 HV Battery Pack Wire Connector)
    5. Reconnect the Le1 No. 2 HV battery pack wire connector.
    6. Install the No. 4 hybrid battery intake duct.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (NO. 2 HV BATTERY PACK WIRE CONNECTOR - BATTERY ECU ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

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

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

    2. Remove the upper No. 1 hybrid battery cover sub-assembly.

      Refer to PROCEDURE - Step 8 [10/2017 - 09/2018] , or refer to PROCEDURE - Step 8 [09/2018 - 10/2020]

    3. Disconnect the e4 battery ECU assembly connector.
      GTY803347Courtesy 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.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Le1 -14 (IGCT) - e4-40 (IGCT) Always Below 1 Ω
      Le1 -5 (AM) - e4-20 (AM) Always Below 1 Ω
      Le1 -14 (IGCT) or e4-40 (IGCT) - Other terminals and body ground Always 10 kΩ or higher
      Le1 -5 (AM) or e4-20 (AM) - Other terminals and body ground Always 10 kΩ or higher
      GTY824597Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (No. 2 HV Battery Pack Wire Connector)
      *b Rear view of wire harness connector
      (to Battery ECU Assembly)
    5. Reconnect the e4 battery ECU assembly connector.
    6. Install the upper No. 1 hybrid battery cover sub-assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (NO. 2 HV BATTERY PACK WIRE CONNECTOR - BATTERY ECU ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

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

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

    2. Remove the upper No. 1 hybrid battery cover sub-assembly.

      Refer to PROCEDURE - Step 8 [10/2017 - 09/2018] , or refer to PROCEDURE - Step 8 [09/2018 - 10/2020]

    3. Disconnect the e4 battery ECU assembly connector.
      GTY803345Courtesy 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.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      e4-16 (CA1H) - Le1 -4 (CA1H) Always Below 1 Ω
      e4-15 (CA1L) - Le1 -13 (CA1L) Always Below 1 Ω
      e4-16 (CA1H) or Le1 -4 (CA1H) - Other terminals and body ground Always 10 kΩ or higher
      e4-15 (CA1L) or Le1 -13 (CA1L) - Other terminals and body ground Always 10 kΩ or higher
      GTY824613Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (No. 2 HV Battery Pack Wire Connector)
      *b Rear view of wire harness connector
      (to Battery ECU Assembly)
    5. Reconnect the e4 battery ECU assembly connector.
    6. Install the upper No. 1 hybrid battery cover sub-assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [10/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - NO. 2 HV BATTERY PACK WIRE CONNECTOR) 
    WARNING:

    Be sure to wear insulated gloves.

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

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

    2. Disconnect the G92 hybrid vehicle control ECU assembly connector.
      NOTE:
      • Before disconnecting the connector, check that it is not loose or disconnected.
      • Check that each connector between the hybrid vehicle control ECU assembly and battery ECU assembly is not loose or disconnected.
    3. Disconnect the G81 shift control ECU connector.
      NOTE:

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

    4. Remove the No. 4 hybrid battery intake duct.

      Refer to PROCEDURE - Step 54 [10/2017 - 09/2018] , or refer to PROCEDURE - Step 54 [09/2018 - 10/2020]

    5. Disconnect the Le1 No. 2 HV battery pack wire connector.
      NOTE:
      • Before disconnecting the connector, check that it is not loose or disconnected.
      • Check the terminals of the connector for deformation and corrosion.
      GTY799783Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Le1 -4 (CA1H) - G92-34 (CA4H) Always Below 1 Ω
      Le1 -13 (CA1L) - G92-35 (CA4L) Always Below 1 Ω
      Le1 -4 (CA1H) or G92-34 (CA4H) - Other terminals and body ground Always 10 kΩ or higher
      Le1 -13 (CA1L) or G92-35 (CA4L) - Other terminals and body ground Always 10 kΩ or higher
      GTY786009Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (No. 2 HV Battery Pack Wire Connector)
      *b Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
      NOTE:

      Make sure that each connector between the No. 2 HV battery pack wire connector and hybrid vehicle control ECU assembly is not loose or disconnected and its terminals are not deformed or corroded.

    7. Reconnect the Le1 No. 2 HV battery pack wire connector.
    8. Install the No. 4 hybrid battery intake duct.
    9. Reconnect the G81 shift control ECU connector.
    10. Reconnect the G92 hybrid vehicle control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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