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Home >> Lexus >> 2021 >> LS 500 Base, RWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> CXPI Communication System - Diagnostic Codes >> CXPI Communication System >> DTC B2352: Lost Communication with Power Integration No. 1 ECU; DTC B2353: Lost Communication with Power Integration No. 2 ECU; DTC B2354: Lost Communication with Power Integration No. 3 ECU [12/2017 - 10/2020] >> Procedure

DTC B2352: Lost Communication with Power Integration No. 1 ECU; DTC B2353: Lost Communication with Power Integration No. 2 ECU; DTC B2354: Lost Communication with Power Integration No. 3 ECU [12/2017 - 10/2020]: Procedure

  1. CLEAR DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [12/2017 - 10/2023]

      Body Electrical > Main Body > Clear DTCs 

      Result

      Result
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK FOR DTC 
    1. Check for DTCs.

      Refer to DTC CHECK / CLEAR [12/2017 - 10/2023]

      Body Electrical > Main Body > Trouble Codes 

      Result

      Result Proceed to
      All DTCs are output A
      DTC B2352 is output B
      DTC B2353 is output (w/ PTC Heater) C
      DTC B2354 is output D

    Result: 

    B 

    See step  10

    Result: 

    C 

    See step  13

    Result: 

    D 

    See step  16

    Result: 

    A 

    See step  3

  3. CHECK NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU 
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the A61 No. 1 semiconductor power integration ECU connector.
    4. Connect the cable to the negative (-) battery terminal.
    5. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [12/2017 - 10/2023]

      Body Electrical > Main Body > Clear DTCs 

    6. Check for DTCs.

      Refer to DTC CHECK / CLEAR [12/2017 - 10/2023]

      Body Electrical > Main Body > Trouble Codes 

      Result

      Result Proceed to
      All DTCs are output (w/ PTC Heater) A
      All DTCs are output (w/o PTC Heater) B
      DTC B2352 is output C

    Result: 

    B 

    See step  5

    Result: 

    C 

    REPLACE NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

    Result: 

    A 

    See step  4

  4. CHECK SEMICONDUCTOR POWER INTEGRATION ECU 
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the G97 semiconductor power integration ECU connector.
    4. Connect the cable to the negative (-) battery terminal.
    5. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [12/2017 - 10/2023]

      Body Electrical > Main Body > Clear DTCs 

    6. Check for DTCs.

      Refer to DTC CHECK / CLEAR [12/2017 - 10/2023]

      Body Electrical > Main Body > Trouble Codes 

      Result

      Result Proceed to
      All DTCs are output A
      DTC B2353 is output B

    Result: 

    B 

    REPLACE SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

    Result: 

    A 

    See step  5

  5. CHECK NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU 
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the L111 No. 3 semiconductor power integration ECU connector.
    4. Connect the cable to the negative (-) battery terminal.
    5. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [12/2017 - 10/2023]

      Body Electrical > Main Body > Clear DTCs 

    6. Check for DTCs.

      Refer to DTC CHECK / CLEAR [12/2017 - 10/2023]

      Body Electrical > Main Body > Trouble Codes 

      Result

      Result Proceed to
      All DTCs are output A
      DTC B2354 is output B

    Result: 

    B 

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

    Result: 

    A 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (CXPI CIRCUIT) 
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the G17 main body ECU (multiplex network body ECU) connector.
    4. Disconnect the A61 No. 1 semiconductor power integration ECU connector.
    5. Disconnect the G97 semiconductor power integration ECU connector. *
      1. *: w/ PTC Heater
    6. Disconnect the L111 No. 3 semiconductor power integration ECU connector.
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G17-5 (CXP1) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU) 
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the G17 main body ECU (multiplex network body ECU) connector.
    4. Disconnect the A61 No. 1 semiconductor power integration ECU connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G17-5 (CXP1) - A61-7 (CXPI) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

    Result: 

    NG 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the G17 main body ECU (multiplex network body ECU) connector.
    2. Disconnect the 5A instrument panel junction block assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G17-5 (CXP1) - 5A-29 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK HARNESS AND CONNECTOR (CXPI CIRCUIT) 
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the G17 main body ECU (multiplex network body ECU) connector.
    4. Disconnect the A61 No. 1 semiconductor power integration ECU connector.
    5. Disconnect the G97 semiconductor power integration ECU connector. *
      1. *: w/ PTC Heater
    6. Disconnect the L111 No. 3 semiconductor power integration ECU connector.
    7. Disconnect the 5A, 5F and 5H instrument panel junction block assembly connectors.
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      5A-29 - Body ground Always 10 kΩ or higher
      5F-20 - Body ground Always 10 kΩ or higher
      5A-51 - Body ground* Always 10 kΩ or higher
      5H-23 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. CHECK HARNESS AND CONNECTOR (NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU - BATTERY AND BODY GROUND) 
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the A61 and A66 No. 1 semiconductor power integration ECU connectors.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A61-6 (GND2) - Body ground Always Below 1 Ω
      A61-13 (GND1) - Body ground Always Below 1 Ω
    5. Connect the cable to the negative (-) battery terminal.
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A66-1 (+B) - Body ground Always 8 to 14 V
      A61-9 (IG) - Body ground Engine switch on (IG) 8 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU) 
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the G17 main body ECU (multiplex network body ECU) connector.
    4. Disconnect the A61 No. 1 semiconductor power integration ECU connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A61-7 (CXPI) - G17-5 (CXP1) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

    Result: 

    NG 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU) 
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the A61 No. 1 semiconductor power integration ECU connector.
    4. Disconnect the 5F instrument panel junction block assembly connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A61-7 (CXPI) - 5F-20 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  13. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR POWER INTEGRATION ECU - BATTERY AND BODY GROUND) 
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the A67 and G97 semiconductor power integration ECU connectors.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G97-13 (GND1) - Body ground Always Below 1 Ω
    5. Connect the cable to the negative (-) battery terminal.
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A67-1 (+B) - Body ground Always 8 to 14 V
      G97-9 (IG) - Body ground Engine switch on (IG) 8 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - SEMICONDUCTOR POWER INTEGRATION ECU) 
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the G17 main body ECU (multiplex network body ECU) connector.
    4. Disconnect the G97 semiconductor power integration ECU connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G97-7 (CXPI) - G17-5 (CXP1) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

    Result: 

    NG 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - SEMICONDUCTOR POWER INTEGRATION ECU) 
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the G97 semiconductor power integration ECU connector.
    4. Disconnect the 5A instrument panel junction block assembly connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G97-7 (CXPI) - 5A-51 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  16. CHECK HARNESS AND CONNECTOR (NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU - BATTERY AND BODY GROUND) 
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the P11 and L111 No. 3 semiconductor power integration ECU connectors.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L111-6 (GND2) - Body ground Always Below 1 Ω
      L111-13 (GND1) - Body ground Always Below 1 Ω
    5. Connect the cable to the negative (-) battery terminal.
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      P11-1 (+B) - Body ground Always 8 to 14 V
      L111-9 (IG) - Body ground Engine switch on (IG) 8 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  17

  17. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU) 
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the G17 main body ECU (multiplex network body ECU) connector.
    4. Disconnect the L111 No. 3 semiconductor power integration ECU connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L111-7 (CXPI) - G17-5 (CXP1) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

    Result: 

    NG 

    See step  18

  18. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU) 
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the L111 No. 3 semiconductor power integration ECU connector.
    4. Disconnect the 5H instrument panel junction block assembly connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L111-7 (CXPI) - 5H-23 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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