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Home >> Toyota >> 2021 >> Mirai XLE >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (W/O Headlight Ecu) - Diagnostic Codes & Circuit Tests >> LIGHTING SYSTEM (w/o Headlight ECU) >> Stop Light Circuit [11/2020 - 12/2022] >> Procedure

Stop Light Circuit [11/2020 - 12/2022]: Procedure

  1. READ VALUE USING GTS 
    1. Depress the brake pedal.
    2. Using the GTS, read the Data List.

      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 signal OFF or ON OFF: Brake pedal released
      ON: Brake pedal depressed      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Stop Light Input Signal

      OK

      Display changes according to the brake pedal operation.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  2

  2. READ VALUE USING GTS 
    1. Depress the brake pedal.
    2. Using the GTS, read the Data List.

      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 OFF or ON OFF: Stop light is off
      ON: Stop light is on      		 Stop lights blink during emergency brake signal control

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Stop Light Output Signal

      OK

      Display changes according to the brake pedal operation.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 2 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

    Result: 

    OK 

    See step  3

  3. READ VALUE USING GTS 
    1. Depress the brake pedal.
    2. Using the GTS, read the Data List.

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Stop Light Fuse Stop light fuse Connect or Disconnect Connect: Fuse not shut off
      Disconnect: Fuse shut off      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Status of Stop Light Fuse

      OK

      The Data List value displays "Connect".

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 2 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

    Result: 

    NG 

    See step  4

  4. CHECK REAR COMBINATION LIGHT CORD LH 
    1. Disconnect the G72 rear combination light cord LH connector.
    2. Depress the brake pedal.
    3. Using the GTS, read the Data List.

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Stop Light Fuse Stop light fuse Connect or Disconnect Connect: Fuse not shut off
      Disconnect: Fuse shut off      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Status of Stop Light Fuse

      OK

      The Data List value displays "Connect".

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  5

  5. CHECK REAR TURN SIGNAL LIGHT LED 
    1. Disconnect the rear turn signal light LED connector.
    2. Depress the brake pedal.
    3. Using the GTS, read the Data List.

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Stop Light Fuse Stop light fuse Connect or Disconnect Connect: Fuse not shut off
      Disconnect: Fuse shut off      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Status of Stop Light Fuse

      OK

      The Data List value displays "Connect".

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR TURN SIGNAL LIGHT LED. Refer to  DISASSEMBLY [11/2020 - ] 

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT CORD LH. Refer to  DISASSEMBLY [11/2020 - ] 

  6. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - NO. 2 SEMICONDUCTOR POWER INTEGRATION ECU) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the A3 stop light switch assembly connector.
    3. Disconnect the G102 No. 2 semiconductor power integration ECU connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A3-2 (L) - G102-10 (STP) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 2 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. CHECK REAR COMBINATION LIGHT CORD RH 
    1. Disconnect the G73 rear combination light cord RH connector.
    2. Depress the brake pedal.
    3. Using the GTS, read the Data List.

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Stop Light Fuse Stop light fuse Connect or Disconnect Connect: Fuse not shut off
      Disconnect: Fuse shut off      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Status of Stop Light Fuse

      OK

      The Data List value displays "Connect".

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  8

  8. CHECK REAR TURN SIGNAL LIGHT LED 
    1. Disconnect the rear turn signal light LED connector.
    2. Depress the brake pedal.
    3. Using the GTS, read the Data List.

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Stop Light Fuse Stop light fuse Connect or Disconnect Connect: Fuse not shut off
      Disconnect: Fuse shut off      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Status of Stop Light Fuse

      OK

      The Data List value displays "Connect".

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR TURN SIGNAL LIGHT LED. Refer to  DISASSEMBLY [11/2020 - ] 

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT CORD RH. Refer to  DISASSEMBLY [11/2020 - ] 

  9. CHECK CENTER STOP LIGHT WIRE 
    1. Disconnect the G69 center stop light wire connector.
    2. Depress the brake pedal.
    3. Using the GTS, read the Data List.

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Stop Light Fuse Stop light fuse Connect or Disconnect Connect: Fuse not shut off
      Disconnect: Fuse shut off      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Status of Stop Light Fuse

      OK

      The Data List value displays "Connect".

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  11

    Result: 

    OK 

    See step  10

  10. CHECK CENTER STOP LIGHT ASSEMBLY 
    1. Disconnect the center stop light assembly connector.
    2. Reconnect the G69 center stop light wire connector.
    3. Depress the brake pedal.
    4. Using the GTS, read the Data List.

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Stop Light Fuse Stop light fuse Connect or Disconnect Connect: Fuse not shut off
      Disconnect: Fuse shut off      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Status of Stop Light Fuse

      OK

      The Data List value displays "Connect".

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CENTER STOP LIGHT ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

    Result: 

    NG 

    REPLACE CENTER STOP LIGHT WIRE. Refer to  REMOVAL [11/2020 - ] 

  11. CHECK BRAKE ACTUATOR ASSEMBLY (NO. 2 SKID CONTROL ECU) 
    1. Disconnect the A6 brake actuator assembly (No. 2 skid control ECU) connector.
    2. Depress the brake pedal.
    3. Using the GTS, read the Data List.

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Stop Light Fuse Stop light fuse Connect or Disconnect Connect: Fuse not shut off
      Disconnect: Fuse shut off      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Status of Stop Light Fuse

      OK

      The Data List value displays "Connect".

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY (NO. 2 SKID CONTROL ECU). Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

    Result: 

    NG 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT CORD RH - NO. 2 SEMICONDUCTOR POWER INTEGRATION ECU) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the G72 rear combination light cord RH connector.
    3. Disconnect the G73 rear combination light cord LH connector.
    4. Disconnect the G102 No. 2 semiconductor power integration ECU connector.
    5. Disconnect the G69 center stop light wire connector.
    6. Disconnect the A6 brake actuator assembly (No. 2 skid control ECU) connector.
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G72-2 (STP) or G102-1 (OUT) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 2 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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