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Home >> Lexus >> 2020 >> LS 500h AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Collision/Avoidance >> Parking Support Alert System - Diagnostic Codes (2 Of 2) & Circuit Tests >> Parking Support Alert System >> No. 1 Clearance Warning Buzzer Circuit [10/2020 - 11/2021] >> Procedure

No. 1 Clearance Warning Buzzer Circuit [10/2020 - 11/2021]: Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Clearance Warning / Active Test.
    5. Check that the buzzer operates by performing the Active Test.

      Body Electrical > Clearance Warning > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Front Buzzer No. 1 clearance warning buzzer OFF or ON Confirm that the vehicle is stopped and the power switch is on (IG)

      Body Electrical > Clearance Warning > Active Test 

      Tester Display
      Front Buzzer

      OK

      The No. 1 clearance warning buzzer sounds.

      Result

      Result Proceed to
      OK A
      NG (w/o Advanced Drive) B
      NG (w/ Advanced Drive) C

    Result: 

    A 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2020 - 11/2021] 

    Result: 

    C 

    See step  5

    Result: 

    B 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 1 CLEARANCE WARNING BUZZER) 
    1. Disconnect the L18 clearance warning ECU assembly connector.
    2. Disconnect the G38 No. 1 clearance warning buzzer connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L18-9 (CBZ) - G38-1 Always Below 1 Ω
      L18-8 (EF) - G38-2 Always Below 1 Ω
      L18-9 (CBZ) or G38-1 - Body ground Always 10 kΩ or higher
      L18-8 (EF) or G38-2 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. REPLACE NO. 1 CLEARANCE WARNING BUZZER 
    1. Replace the No. 1 clearance warning buzzer with a new or known good one.

      Refer to REMOVAL [10/2020 - 11/2021]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Clearance Warning / Active Test.
    5. Check that the buzzer operates by performing the Active Test.

      Body Electrical > Clearance Warning > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Front Buzzer No. 1 clearance warning buzzer OFF or ON Confirm that the vehicle is stopped and the power switch is on (IG)

      Body Electrical > Clearance Warning > Active Test 

      Tester Display
      Front Buzzer

      OK

      The No. 1 clearance warning buzzer sounds.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (NO. 1 CLEARANCE WARNING BUZZER WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE CLEARANCE WARNING ECU ASSEMBLY. Refer to  REMOVAL [10/2020 - 11/2021] 

  5. CHECK HARNESS AND CONNECTOR (NO. 1 CLEARANCE WARNING BUZZER - BATTERY) 
    1. Disconnect the G38 No. 1 clearance warning buzzer connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G38-1 - Body ground Power switch on (IG) 11 to 14 V
      G38-1 - Body ground Power switch off Below 1 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (ADVANCED DRIVE ECU ASSEMBLY - NO. 1 CLEARANCE WARNING BUZZER) 
    1. Disconnect the L213 advanced drive ECU assembly connector.
    2. Disconnect the G38 No. 1 clearance warning buzzer connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G38-2 - L213-19 (BZC2) Always Below 1 Ω
      G38-2 or L213-19 (BZC2) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (ADVANCED DRIVE ECU ASSEMBLY - CLEARANCE WARNING ECU ASSEMBLY) 
    1. Disconnect the L213 advanced drive ECU assembly connector.
    2. Disconnect the L18 clearance warning ECU assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L213-10 (CBZR) - L18-8 (EF) Always Below 1 Ω
      L213-10 (CBZR) or L18-8 (EF) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. REPLACE NO. 1 CLEARANCE WARNING BUZZER 
    1. Replace the No. 1 clearance warning buzzer with a new or known good one.

      Refer to REMOVAL [10/2020 - 11/2021]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  9

  9. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Clearance Warning / Active Test.
    5. Check that the buzzer operates by performing the Active Test.

      Body Electrical > Clearance Warning > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Front Buzzer No. 1 clearance warning buzzer OFF or ON Confirm that the vehicle is stopped and the power switch is on (IG)

      Body Electrical > Clearance Warning > Active Test 

      Tester Display
      Front Buzzer

      OK

      The No. 1 clearance warning buzzer sounds.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (NO. 1 CLEARANCE WARNING BUZZER WAS DEFECTIVE) 

    Result: 

    NG 

    See step  10

  10. REPLACE CLEARANCE WARNING ECU ASSEMBLY 
    1. Replace the clearance warning ECU assembly.

      Refer to REMOVAL [10/2020 - 11/2021]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  11

  11. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Clearance Warning / Active Test.
    5. Check that the buzzer operates by performing the Active Test.

      Body Electrical > Clearance Warning > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Front Buzzer No. 1 clearance warning buzzer OFF or ON Confirm that the vehicle is stopped and the power switch is on (IG)

      Body Electrical > Clearance Warning > Active Test 

      Tester Display
      Front Buzzer

      OK

      The No. 1 clearance warning buzzer sounds.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (CLEARANCE WARNING ECU ASSEMBLY WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE ADVANCED DRIVE ECU ASSEMBLY 

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