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Home >> Toyota >> 2021 >> RAV4 LE, AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/O Vacuum Brake Booster) - Diagnostic Codes (6 Of 8) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster) >> DTC C1380: Stop Light Control Relay Malfunction [02/2019 - 10/2019] >> Procedure

DTC C1380: Stop Light Control Relay Malfunction [02/2019 - 10/2019]: Procedure

  1. CHECK HARNESS AND CONNECTOR (STP, STPO AND STP2 TERMINAL) 
    1. Turn the ignition switch off.
      GTY902872Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))
    2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
    3. Disconnect the A42 skid control ECU (brake booster with master cylinder assembly) connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-33 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A42-33 (STP) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V
      A42-3 (STPO) - Body ground Always 11 to 14 V
      A42-6 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A42-6 (STP2) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V

      Result

      Result Proceed to
      All terminal voltages are normal. A
      Only STP2 terminal voltage abnormal. B
      Only STPO terminal voltage abnormal. C
      Only STP terminal voltage abnormal. (w/ Side Marker) D
      Only STP terminal voltage abnormal. (w/o Side Marker) E
      STPO terminal and STP terminal voltage abnormal. F

    Result: 

    B 

    See step  5

    Result: 

    C 

    See step  9

    Result: 

    D 

    See step  10

    Result: 

    E 

    See step  17

    Result: 

    F 

    See step  21

    Result: 

    A 

    See step  2

  2. PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT RELAY) 
    1. Reconnect the A42 skid control ECU (brake booster with master cylinder assembly) connector.
    2. Select the Active Test on the Techstream.

      Refer to DATA LIST / ACTIVE TEST [02/2019 - 12/2021]

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay Stop light switch assembly (stop light control relay) Stop light switch assembly (Relay) ON/OFF Stop lights come on

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display
      Stop Light Relay
    3. According to the display on the Techstream, perform the Active Test and check the operation of the stop lights.

      OK

      Stop lights turn on/off in accordance with the Active Test.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  3

  3. RECONFIRM DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [02/2019 - 12/2021]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    2. Select the Active Test on the Techstream.

      Refer to DATA LIST / ACTIVE TEST [02/2019 - 12/2021]

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay Stop light switch assembly (stop light control relay) Stop light switch assembly (Relay) ON/OFF Stop lights come on

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display
      Stop Light Relay
    3. According to the display on the Techstream, perform the Active Test.
    4. Check if the same DTC is output.

      Refer to DTC CHECK / CLEAR [02/2019 - 12/2021]

      Chassis > ABS/VSC/TRAC > Trouble Codes 

      Result

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

    Result: 

    A 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [02/2019 - 10/2019] 

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

  4. INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 
    1. Select the Active Test on the Techstream.

      Refer to DATA LIST / ACTIVE TEST [02/2019 - 12/2021]

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay Stop light switch assembly (stop light control relay) Stop light switch assembly (Relay) ON/OFF Stop lights come on

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display
      Stop Light Relay
    2. Measure the voltage according to the value(s) in the table below.
      GTY846345Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Stop Light Switch Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A40-4 (ACC) - Body ground Active Test is on 1.5 V or less

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [02/2019 - 10/2019] 

  5. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - HYBRID VEHICLE CONTROL ECU ASSEMBLY) 
    1. Disconnect the A29 hybrid vehicle control ECU assembly connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY902870Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-6 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A42-6 (STP2) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [02/2019 - 10/2019] 

    Result: 

    NG 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - SMART KEY ECU ASSEMBLY) 
    1. Disconnect the M7 certification ECU (smart key ECU assembly) connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY902870Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-6 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A42-6 (STP2) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SMART KEY ECU ASSEMBLY. Refer to  REMOVAL [02/2019 - 10/2019] 

    Result: 

    NG 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY) 
    1. Disconnect the A40 stop light switch assembly connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY902870Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-6 (STP2) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A42-6 (STP2) - A40-3 (L) Always Below 1 Ω
      A42-6 (STP2) or A40-3 (L) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY) 
    1. Disconnect the A40 stop light switch assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A42-3 (STPO) - A40-4 (ACC) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR COMBINATION LIGHT SOCKET AND WIRE LH) 
    1. Disconnect the N18 rear combination light socket and wire LH connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY902880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-33 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A42-33 (STP) - Body ground Stop light switch assembly off (Brake pedal released) 1.5 V or less

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  13

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR COMBINATION LIGHT SOCKET AND WIRE LH) 
    1. Reconnect the N18 rear combination light socket and wire LH connector.
    2. Disconnect the B stop light LED connector.
    3. Measure the voltage according to the value(s) in the table below.
      GTY902880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-33 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A42-33 (STP) - Body ground Stop light switch assembly off (Brake pedal released) 1.5 V or less

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT LED. Refer to  DISASSEMBLY [11/2018 - ] 

    Result: 

    NG 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR COMBINATION LIGHT SOCKET AND WIRE LH) 
    1. Disconnect the A rear combination light LED connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY902880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-33 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A42-33 (STP) - Body ground Stop light switch assembly off (Brake pedal released) 1.5 V or less

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR COMBINATION LIGHT LED. Refer to  DISASSEMBLY [11/2018 - ] 

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE LH. Refer to  DISASSEMBLY [11/2018 - ] 

  13. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR COMBINATION LIGHT SOCKET AND WIRE RH) 
    1. Disconnect the M14 rear combination light socket and wire RH connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY902880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-33 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A42-33 (STP) - Body ground Stop light switch assembly off (Brake pedal released) 1.5 V or less

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  16

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR COMBINATION LIGHT SOCKET AND WIRE RH) 
    1. Reconnect the M14 rear combination light socket and wire RH connector.
    2. Disconnect the D stop light LED connector.
    3. Measure the voltage according to the value(s) in the table below.
      GTY902880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-33 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A42-33 (STP) - Body ground Stop light switch assembly off (Brake pedal released) 1.5 V or less

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT LED. Refer to  DISASSEMBLY [11/2018 - ] 

    Result: 

    NG 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR COMBINATION LIGHT SOCKET AND WIRE RH) 
    1. Disconnect the C rear combination light LED connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY902880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-33 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A42-33 (STP) - Body ground Stop light switch assembly off (Brake pedal released) 1.5 V or less

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR COMBINATION LIGHT LED. Refer to  DISASSEMBLY [11/2018 - ] 

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE RH. Refer to  DISASSEMBLY [11/2018 - ] 

  16. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - CENTER STOP LIGHT ASSEMBLY) 
    1. Disconnect the E center stop light assembly connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY902880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-33 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A42-33 (STP) - Body ground Stop light switch assembly off (Brake pedal released) 1.5 V or less

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CENTER STOP LIGHT ASSEMBLY. Refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    See step  24

  17. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - STOP LIGHT LED) 
    1. Disconnect the A stop light LED connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY902880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-33 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A42-33 (STP) - Body ground Stop light switch assembly off (Brake pedal released) 1.5 V or less

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT LED. Refer to  DISASSEMBLY [11/2018 - ] 

    Result: 

    NG 

    See step  18

  18. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR COMBINATION LIGHT SOCKET AND WIRE LH) 
    1. Disconnect the N18 rear combination light socket and wire LH connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY902880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-33 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A42-33 (STP) - Body ground Stop light switch assembly off (Brake pedal released) 1.5 V or less

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE LH. Refer to  DISASSEMBLY [11/2018 - ] 

    Result: 

    NG 

    See step  19

  19. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - STOP LIGHT LED) 
    1. Disconnect the B stop light LED connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY902880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-33 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A42-33 (STP) - Body ground Stop light switch assembly off (Brake pedal released) 1.5 V or less

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT LED. Refer to  DISASSEMBLY [11/2018 - ] 

    Result: 

    NG 

    See step  20

  20. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR COMBINATION LIGHT SOCKET AND WIRE RH) 
    1. Disconnect the M14 rear combination light socket and wire RH connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY902880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-33 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A42-33 (STP) - Body ground Stop light switch assembly off (Brake pedal released) 1.5 V or less

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE RH. Refer to  DISASSEMBLY [11/2018 - ] 

    Result: 

    NG 

    See step  23

  21. CHECK STOP LIGHT SWITCH ASSEMBLY POWER SOURCE CIRCUIT 
    1. Disconnect the A40 stop light switch assembly connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY909679Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A40-7 (B) - Body ground Always 11 to 14 V
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A40-2 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  22

  22. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A42-3 (STPO) or A40-4 (ACC) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  23. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - CENTER STOP LIGHT ASSEMBLY) 
    1. Disconnect the C center stop light assembly connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY902880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-33 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A42-33 (STP) - Body ground Stop light switch assembly off (Brake pedal released) 1.5 V or less

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CENTER STOP LIGHT ASSEMBLY. Refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    See step  24

  24. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - CENTER STOP LIGHT CORD ASSEMBLY) 
    1. Disconnect the R1 center stop light cord assembly connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY902880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-33 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A42-33 (STP) - Body ground Stop light switch assembly off (Brake pedal released) 1.5 V or less

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CENTER STOP LIGHT CORD ASSEMBLY. Refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    See step  25

  25. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY) 
    1. Disconnect the A40 stop light switch assembly connector.
      GTY902880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-33 (STP) - Body ground Always 1.5 V or less

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  26

  26. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A40-1 (OUT) - A42-33 (STP) Always Below 1 Ω
      A40-1 (OUT) or A42-33 (STP) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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