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Home >> Lexus >> 2021 >> LS 500 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> CXPI Communication System - Diagnostic Codes >> CXPI Communication System >> DTC B2353-87: Power Integration No. 2 System Missing Message; DTC B2362-87: Overhead Module Missing Message [10/2023 - ] >> Procedure

DTC B2353-87: Power Integration No. 2 System Missing Message; DTC B2362-87: Overhead Module Missing Message [10/2023 - ]: Procedure

  1. CHECK VEHICLE TYPE 
    1. Check the vehicle type.

      Result

      Result Proceed to
      w/ PTC Heater A
      w/o PTC Heater B

    Result: 

    B 

    See step  10

    Result: 

    A 

    See step  2

  2. CHECK FOR DTC 
    1. Check for DTCs.

      Body Electrical > Main Body > Trouble Codes 

      Result

      Result Proceed to
      B2353-87 and B2362-87 are output A
      B2353-87 is output B
      B2362-87 is output C

    Result: 

    B 

    See step  6

    Result: 

    C 

    See step  8

    Result: 

    A 

    See step  3

  3. INSPECT MAP LIGHT ASSEMBLY 

    Pre-procedure1

    1. Disconnect the N7 map light assembly connector.
    2. Clear the DTCs.

      Body Electrical > Main Body > Clear DTCs 

      Procedure1

    3. Check for DTCs.

      Body Electrical > Main Body > Trouble Codes 

      Result

      Result Proceed to
      B2353-87 and B2362-87 are output A
      B2362-87 is output B

      Post-procedure1

    4. None

    Result: 

    B 

    REPLACE MAP LIGHT ASSEMBLY. Refer to  REMOVAL [12/2017 - ] 

    Result: 

    A 

    See step  4

  4. CHECK SEMICONDUCTOR POWER INTEGRATION ECU 

    Pre-procedure1

    1. Disconnect the G97 semiconductor power integration ECU connector.
    2. Clear the DTCs.

      Body Electrical > Main Body > Clear DTCs 

      Procedure1

    3. Check for DTCs.

      Body Electrical > Main Body > Trouble Codes 

      Result

      Result Proceed to
      B2352-87 and B2362-87 are output A
      B2353-87 is output B

      Post-procedure1

    4. None

    Result: 

    B 

    REPLACE SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [10/2023 - ] 

    Result: 

    A 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (CXPI COMMUNICATION LINE) 

    Pre-procedure1

    1. Disconnect the G206 main body ECU (multiplex network body ECU) connector.
    2. Disconnect the N7 map light assembly connector.
    3. Disconnect the G97 semiconductor power integration ECU connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      G97-7 (CXPI) - G206-13 (CXP2) Always Below 1 Ω
      G97-7 (CXPI) or G206-13 (CXP2) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG
    5. None

      Post-procedure1

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [10/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR POWER INTEGRATION ECU POWER SOURCE CIRCUIT) 

    Pre-procedure1

    1. Disconnect the A67 and G97 semiconductor power integration ECU connectors.

      Procedure1

    2. 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
    3. 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 11 to 14 V
      G97-9 (IG) - Body ground Ignition switch ON 11 to 14 V
      G97-9 (IG) - Body ground Ignition switch off Below 1 V

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (NO. 2 SEMICONDUCTOR POWER INTEGRATION ECU - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 

    Pre-procedure1

    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the G97 semiconductor power integration ECU connector.
    4. Disconnect the G206 main body ECU (multiplex network body ECU) connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      G97-7 (CXPI) - G206-13 (CXP2) Cable disconnected from negative (-) battery terminal Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    6. None

    Result: 

    OK 

    REPLACE SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [10/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY POWER SOURCE CIRCUIT) 

    Pre-procedure1

    1. Disconnect the N7 map light assembly connector.

      Procedure1

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      N7-19 (+B) - Body ground Always 10.5 to 16 V*1
      11 to 14 V*2

      *1: w/ Stop and Start System

      *2: w/o Stop and Start System

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      N7-22 (GND) - Body ground Always Below 1 Ω

      Result

      Result Proceed to
      OK A
      NG (+B terminal) (w/ Stop and Start Sytem) B
      • NG (Other terminal) (w/ Stop and Start Sytem)
      • NG (w/o Stop and Start Sytem)
      		 C

      Post-procedure1

    4. None

    Result: 

    B 

    GO TO APPROPRIATE STOP AND START SYSTEM 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 

    Pre-procedure1

    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the N7 main body ECU (multiplex network body ECU) connector.
    4. Disconnect the G206 main body ECU (multiplex network body ECU) connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      N7-20 (MPX) - G206-13 (CXP2) Cable disconnected from negative (-) battery terminal Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    6. None

    Result: 

    OK 

    REPLACE MAP LIGHT ASSEMBLY. Refer to  REMOVAL [12/2017 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 

    Pre-procedure1

    1. Disconnect the N7 main body ECU (multiplex network body ECU) connector.
    2. Disconnect the G206 main body ECU (multiplex network body ECU) connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      N7-20 (MPX) - G206-13 (CXP2) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY POWER SOURCE CIRCUIT) 

    Pre-procedure1

    1. Disconnect the N7 map light assembly connector.

      Procedure1

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      N7-19 (+B) - Body ground Always 10.5 to 16 V*1
      11 to 14 V*2

      *1: w/ Stop and Start System

      *2: w/o Stop and Start System

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      N7-22 (GND) - Body ground Always Below 1 Ω

      Result

      Result Proceed to
      OK A
      NG (+B terminal) (w/ Stop and Start Sytem) B
      • NG (Other terminal) (w/ Stop and Start Sytem)
      • NG (w/o Stop and Start Sytem)
      		 C

      Post-procedure1

    4. None

    Result: 

    B 

    GO TO APPROPRIATE STOP AND START SYSTEM 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  12

  12. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

    Pre-procedure1

    1. Disconnect the N7 map light assembly connector.

      Procedure1

    2. Using an oscilloscope, check the waveform.

      OK

      Tester Connection Switch Condition Specified Condition
      G206-13 (CXP2) - Body ground Ignition switch ON Pulse generation

      Result

      Proceed to
      OK
      NG
    3. None

      Post-procedure1

    Result: 

    OK 

    REPLACE MAP LIGHT ASSEMBLY. Refer to  REMOVAL [12/2017 - ] 

    Result: 

    NG 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [10/2023 - ] 

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