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Home >> Lexus >> 2021 >> LC 500 2D Coupe >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System - Diagnostic Codes (Coupe) (3 Of 4) >> Electronically Controlled Brake System >> DTC C1380/15: Stop Light Control Relay Malfunction [03/2017 - 09/2018] >> Procedure

DTC C1380/15: Stop Light Control Relay Malfunction [03/2017 - 09/2018]: Procedure

  1. CHECK FOR DTCs (POWER INTEGRATION SYSTEM) 
    1. Check for DTCs.

      Refer to DTC CHECK / CLEAR [03/2017 - ]

      Body Electrical > Power Integration No. 3 > Trouble Codes 

      HINT: 

      If there is a malfunction in the No. 3 semiconductor power integration ECU, integration relay system DTCs may also have been detected. Check the integration relay system first.

      Result

      Result Proceed to
      Power integration system DTCs are not output A
      Power integration system DTCs are output B

    Result: 

    B 

    GO TO POWER INTEGRATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - ] 

    Result: 

    A 

    See step  2

  2. READ VALUE USING TECHSTREAM (STOP LIGHT INPUT SIGNAL, STOP LIGHT OUTPUT SIGNAL, STOP LIGHT SW AND STOP LIGHT RELAY) 
    1. Using the Techstream, check the Data List "Stop Light Input Signal", "Stop Light Output Signal", "Stop Light SW" and "Stop Light Relay" with the brake pedal operated.

      Refer to DATA LIST / ACTIVE TEST [03/2017 - 05/2023]

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Input Signal Stop light switch assembly input condition ON or OFF OFF: Brake pedal released
      ON: Brake pedal depressed      		 -
      Stop Light Output Signal Stop light output condition ON or OFF ON: Stop light is on
      OFF: Stop light is off      		 Stop lights blink during emergency brake signal control

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Stop Light Input Signal
      Stop Light Output Signal

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light SW Stop light switch assembly ON or OFF ON: Brake pedal depressed
      OFF: Brake pedal released      		 -
      Stop Light Relay No. 3 Semiconductor power integration ECU (STP2 terminal input) ON or OFF ON: Brake pedal depressed
      OFF: Brake pedal released      		 -

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      Stop Light SW
      Stop Light Relay

      OK

      Brake pedal operation Data List Display Condition
      No. 3 Semiconductor Power Integration ECU Skid Control ECU Assembly
      Stop Light Input Signal Stop Light Output Signal Stop Light Switch Stop Light Relay
      Brake pedal depressed ON ON ON ON

      Result

      Brake pedal operation Data List Display Condition Result
      No. 3 Semiconductor Power Integration ECU Skid Control ECU Assembly
      Stop Light Input Signal Stop Light Output Signal Stop Light Switch Stop Light Relay
      Brake pedal depressed ON ON ON ON A
      ON ON OFF ON B
      ON OFF ON OFF C
      ON ON ON OFF D
      OFF OFF ON OFF E

    Result: 

    B 

    See step  6

    Result: 

    C 

    See step  11

    Result: 

    D 

    See step  14

    Result: 

    E 

    See step  19

    Result: 

    A 

    See step  3

  3. READ VALUE USING TECHSTREAM (STOP LIGHT INPUT SIGNAL, STOP LIGHT OUTPUT SIGNAL, STOP LIGHT SW AND STOP LIGHT RELAY) 
    1. Using the Techstream, check the Data List "Stop Light Input Signal", "Stop Light Output Signal", "Stop Light SW" and "Stop Light Relay" with the brake pedal operated.

      Refer to DATA LIST / ACTIVE TEST [03/2017 - 05/2023]

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Input Signal Stop light switch assembly input condition ON or OFF ON: Brake pedal depressed
      OFF: Brake pedal released      		 -
      Stop Light Output Signal Stop light output condition ON or OFF ON: Stop light is on
      OFF: Stop light is off      		 Stop lights blink during emergency brake signal control

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Stop Light Input Signal
      Stop Light Output Signal

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light SW Stop light switch assembly ON or OFF ON: Brake pedal depressed
      OFF: Brake pedal released      		 -
      Stop Light Relay No. 3 Semiconductor power integration ECU (STP2 terminal input) ON or OFF ON: Brake pedal depressed
      OFF: Brake pedal released      		 -

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      Stop Light SW
      Stop Light Relay

      OK

      Brake pedal operation Data List Display Condition
      No. 3 Semiconductor Power Integration ECU Skid Control ECU Assembly
      Stop Light Input Signal Stop Light Output Signal Stop Light Switch Stop Light Relay
      Brake pedal depressed OFF OFF OFF OFF

      Result

      Brake pedal operation Data List Display Condition Result
      No. 3 Semiconductor Power Integration ECU Skid Control ECU Assembly
      Stop Light Input Signal Stop Light Output Signal Stop Light Switch Stop Light Relay
      Brake pedal depressed OFF OFF OFF OFF A
      OFF ON OFF ON B

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  4

  4. PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT RELAY) 
    1. Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test.
    2. Perform "Active Test" according to the display on the Techstream.

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display Measurement Item Restrict Condition Diagnostic Note
      Stop Light Relay No. 3 Semiconductor power integration ECU ECU (Stop light output) ON/OFF Stop lights come on

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light SW Stop light switch assembly ON or OFF ON: Brake pedal depressed
      OFF: Brake pedal released      		 -
      Stop Light Relay No. 3 Semiconductor power integration ECU (STP2 terminal input) ON or OFF ON: Brake pedal depressed
      OFF: Brake pedal released      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Radar Cruise Input Signal Radar cruise operation condition ON or OFF ON: Radar cruise system operates
      OFF: Radar cruise system does not operate      		 -
      Stop Light Output Signal Stop light output condition Stop light output condition ON: Stop light is on
      OFF: Stop light is off      		 Stop lights blink during emergency brake signal control

      Chassis > ABS/VSC/TRAC > Active Test 

      Active Test Display
      Stop Light Relay
      Data List Display
      Stop Light Relay
      Stop Light Relay Output

      Body Electrical > Power Integration No. 3 > Dual Data List 

      Data List Display
      Radar Cruise Input Signal
      Stop Light Output Signal

      OK

      Active Test Condition Data List Display Condition
      Stop Light Relay
      Stop Light Relay No. 3 Semiconductor Power Integration ECU Skid Control ECU Assembly
      Stop Light Input Signal Stop Light Output Signal Stop Light Switch Stop Light Relay
      ON ON ON ON ON

      Result

      Active Test Condition Data List Display Condition Result
      Stop Light Relay Skid Control ECU Assembly No. 3 Semiconductor Power Integration ECU
      Stop Light Relay Stop Light Relay Output Radar Cruise Input Signal Stop Light Output Signal
      ON ON ON ON ON A
      OFF ON ON OFF B
      OFF OFF OFF OFF C

    Result: 

    B 

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    C 

    See step  9

    Result: 

    A 

    See step  5

  5. RECONFIRM DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [03/2017 - 09/2018]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    2. Perform "Active Test" according to the display on the Techstream.

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display Measurement Item Restrict Condition Diagnostic Note
      Stop Light Relay No. 3 Semiconductor power integration ECU ECU (Stop light output) ON/OFF Stop lights come on

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display
      Stop Light Relay
      NOTE:

      Perform the Active Test "Stop Light Relay" for 2 seconds or more.

      HINT: 

      By performing the Active Test, DTCs can be detected.

    3. Check if the same DTC is output.

      Refer to DTC CHECK / CLEAR [03/2017 - 09/2018]

      Chassis > ABS/VSC/TRAC > Trouble Codes 

      Result

      Result Proceed to
      DTC C1380/15 is not output. A
      DTC C1380/15 is output. B

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 04/2020] 

    Result: 

    B 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023] 

  6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU) 
    1. Disconnect the A10 skid control ECU assembly connector.
    2. Disconnect the X99 No. 3 semiconductor power integration ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A10-16 (STP) - X99-10 (STP) Always Below 1 Ω
      A10-16 (STP) or X99-10(STP) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. READ VALUE USING TECHSTREAM (RADAR CRUISE INPUT SIGNAL, STOP LIGHT OUTPUT SIGNAL, STOP LIGHT RELAY AND STOP LIGHT RELAY OUTPUT) 
    1. Using the Techstream, check the Data List "Radar Cruise Input Signal", "Stop Light Output Signal", "Stop Light Relay" and "Stop Light Relay Output" with the brake pedal operated.

      Refer to DATA LIST / ACTIVE TEST [03/2017 - 05/2023]

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Radar Cruise Input Signal Radar cruise operation condition ON or OFF ON: Radar cruise system operates
      OFF: Radar cruise system does not operate      		 -
      Stop Light Output Signal Stop light output condition ON or OFF ON: Stop light is on
      OFF: Stop light is off      		 Stop lights blink during emergency brake signal control

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Radar Cruise Input Signal
      Stop Light Output Signal

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Relay No. 3 Semiconductor power integration ECU (STP2 terminal input) ON or OFF ON: Brake pedal depressed
      OFF: Brake pedal released      		 -
      Stop Light Relay Output No. 3 Semiconductor power integration ECU (STPO terminal input) ON or OFF ON: Output on
      OFF: Output off      		 -

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      Stop Light Relay
      Stop Light Relay Output

      OK

      Brake pedal operation Data List Display Condition
      No. 3 Semiconductor Power Integration ECU Skid Control ECU Assembly
      Stop Light Input Signal Stop Light Output Signal Stop Light Switch Stop Light Relay
      Brake pedal depressed OFF OFF OFF OFF

      Result

      Brake pedal operation Data List Display Condition Result
      No. 3 Semiconductor Power Integration ECU Skid Control ECU Assembly
      Stop Light Input Signal Stop Light Output Signal Stop Light Switch Stop Light Relay
      Brake pedal depressed ON ON ON ON A
      ON ON ON OFF B
      OFF ON ON OFF C

    Result: 

    A 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    C 

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    B 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU) 
    1. Disconnect the A10 skid control ECU assembly connector.
    2. Disconnect the X99 No. 3 semiconductor power integration ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A10-4 (STPO) - X99-14 (ACC) Always Below 1 Ω
      A10-4 (STPO) or X99-14 (ACC) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU) 
    1. Disconnect the A10 skid control ECU assembly connector.
    2. Disconnect the X99 No. 3 semiconductor power integration ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A10-4 (STPO) - X99-14 (ACC) Always Below 1 Ω
      A10-4 (STPO) or X99-14 (ACC) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (STPO TERMINAL) 
    1. Disconnect the A10 skid control ECU assembly connector.
      GTY829901Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU Assembly)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A10-4 (STPO) - Body ground Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    NG 

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [03/2017 - 05/2023] 

  11. READ VALUE USING TECHSTREAM (STOP LIGHT OUTPUT SIGNAL AND STATUS OF STOP LIGHT FUSE) 
    1. Using the Techstream, check the Data List "Stop Light Output Signal" and "Status of Stop Light Fuse" with the brake pedal operated.

      Refer to DATA LIST / ACTIVE TEST [03/2017 - 05/2023]

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Output Signal Stop light output condition ON or OFF ON: Stop light is on
      OFF: Stop light is off      		 Stop lights blink during emergency brake signal control
      Status of Stop Light Fuse Stop light fuse condition Disconnect or Connect Disconnect: Fuse shut off
      Connect: Fuse not shut off      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Stop Light Output Signal
      Status of Stop Light Fuse

      OK

      Brake pedal operation Data List Display Condition
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect

      Result

      Brake pedal operation Data List Display Condition Result
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed OFF Connect A
      OFF Disconnect B

    Result: 

    A 

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    B 

    See step  12

  12. READ VALUE USING TECHSTREAM (STOP LIGHT OUTPUT SIGNAL AND STATUS OF STOP LIGHT FUSE) 
    1. Disconnect the X70 rear combination light assembly LH connector.
    2. Using the Techstream, check the Data List "Stop Light Output Signal" and "Status of Stop Light Fuse" with the brake pedal operated.

      Refer to DATA LIST / ACTIVE TEST [03/2017 - 05/2023]

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Output Signal Stop light output condition ON or OFF ON: Stop light is on
      OFF: Stop light is off      		 Stop lights blink during emergency brake signal control
      Status of Stop Light Fuse Stop light fuse condition Disconnect or Connect Disconnect: Fuse shut off
      Connect: Fuse not shut off      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Stop Light Output Signal
      Status of Stop Light Fuse

      OK

      Brake pedal operation Data List Display Condition
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect

      Result

      Brake pedal operation Data List Display Condition Result
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect A
      OFF Disconnect B

    Result: 

    A 

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    B 

    See step  13

  13. READ VALUE USING TECHSTREAM (STOP LIGHT OUTPUT SIGNAL AND STATUS OF STOP LIGHT FUSE) 
    1. Disconnect the X69 rear combination light assembly RH connector.
    2. Using the Techstream, check the Data List "Stop Light Output Signal" and "Status of Stop Light Fuse" with the brake pedal operated.

      Refer to DATA LIST / ACTIVE TEST [03/2017 - 05/2023]

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Output Signal Stop light output condition ON or OFF ON: Stop light is on
      OFF: Stop light is off      		 Stop lights blink during emergency brake signal control
      Status of Stop Light Fuse Stop light fuse condition Disconnect or Connect Disconnect: Fuse shut off
      Connect: Fuse not shut off      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Stop Light Output Signal
      Status of Stop Light Fuse

      OK

      Brake pedal operation Data List Display Condition
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect

      Result

      Brake pedal operation Data List Display Condition Result
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect A
      OFF Disconnect B

    Result: 

    A 

    REPLACE REAR COMBINATION LIGHT ASSEMBLY RH. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    B 

    See step  15

  14. CHECK HARNESS AND CONNECTOR (STPO TERMINAL) 
    1. Disconnect the A9 skid control ECU assembly connector.
      GTY789536Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU Assembly)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A9-14 (STP2) - Body ground Brake pedal depressed 8 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    NG 

    See step  16

  15. READ VALUE USING TECHSTREAM (STOP LIGHT OUTPUT SIGNAL AND STATUS OF STOP LIGHT FUSE) 
    1. Disconnect the center stop without harness light assembly connector.
    2. Using the Techstream, check the Data List "Stop Light Output Signal" and "Status of Stop Light Fuse" with the brake pedal operated.

      Refer to DATA LIST / ACTIVE TEST [03/2017 - 05/2023]

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Output Signal Stop light output condition ON or OFF ON: Stop light is on
      OFF: Stop light is off      		 Stop lights blink during emergency brake signal control
      Status of Stop Light Fuse Stop light fuse condition Disconnect or Connect Disconnect: Fuse shut off
      Connect: Fuse not shut off      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Stop Light Output Signal
      Status of Stop Light Fuse

      OK

      Brake pedal operation Data List Display Condition
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect

      Result

      Brake pedal operation Data List Display Condition Result
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect A
      OFF Disconnect B

    Result: 

    A 

    REPLACE CENTER STOP WITHOUT HARNESS LIGHT ASSEMBLY. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    B 

    See step  17

  16. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU) 
    1. Disconnect the A9 skid control ECU assembly connector.
    2. Disconnect the X99 No. 3 semiconductor power integration ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A9-14(STP2) - X99-1(OUT) Always Below 1 Ω
      A9-14(STP2) or X99-1(OUT) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  17. READ VALUE USING TECHSTREAM (STOP LIGHT OUTPUT SIGNAL AND STATUS OF STOP LIGHT FUSE) 
    1. Disconnect the X64 light wire connector.
    2. Using the Techstream, check the Data List "Stop Light Output Signal" and "Status of Stop Light Fuse" with the brake pedal operated.

      Refer to DATA LIST / ACTIVE TEST [03/2017 - 05/2023]

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Output Signal Stop light output condition ON or OFF ON: Stop light is on
      OFF: Stop light is off      		 Stop lights blink during emergency brake signal control
      Status of Stop Light Fuse Stop light fuse condition Disconnect or Connect Disconnect: Fuse shut off
      Connect: Fuse not shut off      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Stop Light Output Signal
      Status of Stop Light Fuse

      OK

      Brake pedal operation Data List Display Condition
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect

      Result

      Brake pedal operation Data List Display Condition Result
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect A
      OFF Disconnect B

    Result: 

    A 

    REPLACE LIGHT WIRE. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    B 

    See step  18

  18. READ VALUE USING TECHSTREAM (STOP LIGHT OUTPUT SIGNAL AND STATUS OF STOP LIGHT FUSE) 
    1. Disconnect the A9 skid control ECU assembly connector.
    2. Using the Techstream, check the Data List "Stop Light Output Signal" and "Status of Stop Light Fuse" with the brake pedal operated.

      Refer to DATA LIST / ACTIVE TEST [03/2017 - 05/2023]

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Output Signal Stop light output condition ON or OFF ON: Stop light is on
      OFF: Stop light is off      		 Stop lights blink during emergency brake signal control
      Status of Stop Light Fuse Stop light fuse condition Disconnect or Connect Disconnect: Fuse shut off
      Connect: Fuse not shut off      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Stop Light Output Signal
      Status of Stop Light Fuse

      OK

      Brake pedal operation Data List Display Condition
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect

      Result

      Brake pedal operation Data List Display Condition Result
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect A
      OFF Disconnect B

    Result: 

    A 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    B 

    See step  20

  19. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU) 
    1. Disconnect the A10 skid control ECU assembly connector.
    2. Disconnect the X99 No. 3 semiconductor power integration ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A10-16 (STP) - X99-10 (STP) Always Below 1 Ω
      A10-16 (STP) or X99-10 (STP) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  20. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU) 
    1. Disconnect the X99 No. 3 semiconductor power integration ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      X99-1 (OUT) - A9-14 (STP2) Always Below 1 Ω
      X99-1 (OUT) or A9-14 (STP2) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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