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Home >> Lexus >> 2023 >> NX 350 Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Front Camera System - Diagnostic Codes & Circuit Tests >> Front Camera System >> DTC U0232-87: Lost Communication with Side Obstacle Detection Control Module "A" Missing Message; DTC U0241-87: Lost Communication with Headlamp Control Module "A" Missing Message; DTC U1236-87: Lost Communication with Cruise Control Front Distance Range Sensor Front Side "B" Missing Message [03/2022 - ] >> Procedure
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DTC U0232-87: Lost Communication with Side Obstacle Detection Control Module "A" Missing Message; DTC U0241-87: Lost Communication with Headlamp Control Module "A" Missing Message; DTC U1236-87: Lost Communication with Cruise Control Front Distance Range Sensor Front Side "B" Missing Message [03/2022 - ]: Procedure

  1. CHECK FOR DTCs 
    1. Read each DTC and check the diagnosis pattern using the table below.

      Chassis > Front Recognition Camera > Trouble Codes 

      Body Electrical > Headlight Control > Trouble Codes 

      Pattern DTC output part name
      (Display on GTS)
      Front Recognition Camera Headlight Control
      Pattern 1 U0232-87 U0241-87*2 U1236-87*1 U023A-87
      Pattern 2 U0232-87 - - -
      Pattern 3*2 - U0241-87*2 - U023A-87
      Pattern 4*1, *3 - - U1236-87*1 -

      HINT: 

      *1: w/ Front Cross Traffic Alert

      *2: w/ Automatic Headlight Beam Level Control System

      *3: When DTCs or vehicle control history (RoB) related to the front side radar sensor is output, inspect the front radar system first.

      GO TO DIAGNOSTIC TROUBLE CODE CHART: Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2021 - ]

      GO TO VEHICLE CONTROL HISTORY (RoB): Refer to VEHICLE CONTROL HISTORY (RoB) [11/2021 - ]

      Result

      Result Proceed to
      Pattern 1 A
      Pattern 2 B
      Pattern 3 (except TMMC Made) C
      Pattern 3 (for TMMC Made) D
      Pattern 4 E

    Result: 

    B 

    See step  8

    Result: 

    C 

    See step  9

    Result: 

    D 

    See step  10

    Result: 

    E 

    See step  11

    Result: 

    A 

    See step  2

  2. INSPECT BLIND SPOT MONITOR SENSOR RH 
    1. Disconnect the O16 blind spot monitor sensor RH connector.
    2. Clear the DTCs.

      Chassis > Front Recognition Camera > Clear DTCs 

    3. Check for DTCs.

      Chassis > Front Recognition Camera > Trouble Codes 

      Result

      Result Proceed to
      U0232-87 is output A
      U0232-87, U0241-87 and U1236-87 are not output (w/ Automatic Headlight Beam Level Control System with Front Cross Traffic Alert) (except TMMC Made) B
      U0232-87, U0241-87 and U1236-87 are not output (w/ Automatic Headlight Beam Level Control System with Front Cross Traffic Alert) (for TMMC Made) C
      U0232-87 and U1236-87 are not output (w/o Automatic Headlight Beam Level Control System with Front Cross Traffic Alert) D
      U0232-87 is not output (w/o Automatic Headlight Beam Level Control System without Front Cross Traffic Alert) E

    Result: 

    A 

    REPLACE BLIND SPOT MONITOR SENSOR RH. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    C 

    See step  4

    Result: 

    D 

    See step  5

    Result: 

    E 

    See step  6

    Result: 

    B 

    See step  3

  3. INSPECT HEADLIGHT ECU SUB-ASSEMBLY LH 
    1. Disconnect the A49 headlight ECU sub-assembly LH connector.
    2. Clear the DTCs.

      Chassis > Front Recognition Camera > Clear DTCs 

    3. Check for DTCs.

      Chassis > Front Recognition Camera > Trouble Codes 

      Result

      Result Proceed to
      U0241-87 is output A
      U0232-87, U0241-87 and U1236-87 are not output (w/ Front Cross Traffic Alert) B
      U0232-87 and U0241-87 are not output (w/o Front Cross Traffic Alert) C

    Result: 

    A 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    B 

    See step  5

    Result: 

    C 

    See step  6

  4. INSPECT HEADLIGHT ASSEMBLY LH 
    1. Disconnect the A49 headlight assembly LH connector.
    2. Clear the DTCs.

      Chassis > Front Recognition Camera > Clear DTCs 

    3. Check for DTCs.

      Chassis > Front Recognition Camera > Trouble Codes 

      Result

      Result Proceed to
      U0241-87 is output A
      U0232-87, U0241-87 and U1236-87 are not output (w/ Front Cross Traffic Alert) B
      U0232-87 and U0241-87 are not output (w/o Front Cross Traffic Alert) C

    Result: 

    A 

    REPLACE HEADLIGHT ASSEMBLY LH. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    B 

    See step  5

    Result: 

    C 

    See step  6

  5. INSPECT FRONT SIDE RADAR SENSOR (RH) 
    1. Disconnect the A57 front side radar sensor (RH) connector.
    2. Clear the DTCs.

      Chassis > Front Recognition Camera > Clear DTCs 

    3. Check for DTCs.

      Chassis > Front Recognition Camera > Trouble Codes 

      Result

      Result Proceed to
      U1236-87 is output A
      U0232-87, U0241-87 and U1236-87 are not output (w/ Automatic Headlight Beam Level Control System) B
      U0232-87 and U1236-87 are not output (w/o Automatic Headlight Beam Level Control System)

    Result: 

    A 

    REPLACE FRONT SIDE RADAR SENSOR (RH). Refer to  REMOVAL [11/2021 - 03/2024]  , or refer to  REMOVAL [03/2024 - ] 

    Result: 

    B 

    See step  6

  6. CHECK CAN MAIN WIRE (FORWARD RECOGNITION CAMERA) 
    GTY1070928Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Forward Recognition Camera)
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the M17 forward recognition camera connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M17-3 (CA3L) - M17-4 (CA3H) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      M17-3 (CA3L) - Body ground Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      M17-4 (CA3H) - Body ground
      M17-3 (CA3L) - +B Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      M17-4 (CA3H) - +B

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    See step  7

  7. CHECK CAN MAIN WIRE (NO. 4 CAN JUNCTION TERMINAL) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Connect the M17 forward recognition camera connector.
    3. Disconnect the G69 No. 4 CAN junction terminal connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G69-2 (CANL) - G69-3 (CANH) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      G69-2 (CANL) - Body ground Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      G69-3 (CANH) - Body ground
      G69-2 (CANL) - +B Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      G69-3 (CANH) - +B

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 4 CAN JUNCTION TERMINAL 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. CHECK CAN MAIN WIRE (BLIND SPOT MONITOR SENSOR RH) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the O16 blind spot monitor sensor RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O16-2 (CA1P) - O16-7 (CA1N) Cable disconnected from negative (-) auxiliary battery terminal 54 to 66 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BLIND SPOT MONITOR SENSOR RH. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK CAN MAIN WIRE (HEADLIGHT ECU SUB-ASSEMBLY LH) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the A49 headlight ECU sub-assembly LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A49-21 (LCL) - A49-22 (LCH) Cable disconnected from negative (-) auxiliary battery terminal 54 to 66 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. CHECK CAN MAIN WIRE (HEADLIGHT ASSEMBLY LH) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the A49 headlight assembly LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A49-21 (LCL) - A49-22 (LCH) Cable disconnected from negative (-) auxiliary battery terminal 54 to 66 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEADLIGHT ASSEMBLY LH. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  11. CHECK CAN MAIN WIRE (FRONT SIDE RADAR SENSOR (RH)) 

    HINT: 

    When DTCs or vehicle control history (RoB) related to the front side radar sensor is output, inspect the front radar system first.

    GO TO DIAGNOSTIC TROUBLE CODE CHART: Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2021 - ]

    GO TO VEHICLE CONTROL HISTORY (RoB): Refer to VEHICLE CONTROL HISTORY (RoB) [11/2021 - ]

    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the A57 front side radar sensor (RH) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A57-2 (CA1P) - A57-7 (CA1N) Cable disconnected from negative (-) auxiliary battery terminal 54 to 66 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FRONT SIDE RADAR SENSOR (RH). Refer to  REMOVAL [11/2021 - 03/2024]  , or refer to  REMOVAL [03/2024 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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