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Home >> Toyota >> 2016 >> Highlander Hybrid Limited >> Repair and Diagnosis >> Restraints >> Seat Belts >> Pre-Collision System - Diagnostic Codes & Circuit Tests - (Hybrid) >> Pre-Collision System >> DTC C1A4B: Stop Light Relay Circuit [11/2016 - ] >> Procedure

DTC C1A4B: Stop Light Relay Circuit [11/2016 - ]: Procedure

  1. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU ASSEMBLY CONNECTOR) 
    1. Turn the power switch off.
    2. Disconnect the A63 and A64 skid control ECU assembly connector.
      GTY732907Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid control ECU assembly)      		 - -
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A63-14 (STP2) - Body ground Brake pedal depressed 11 to 14 V
      Brake pedal released Below 1.5 V
      A64-4 (STPO) - Body ground Always 11 to 14 V
      A64-16 (STP) - Body ground Brake pedal depressed 11 to 14 V
      Brake pedal released Below 1.5 V
    4. Connect the A63 and A64 skid control ECU assembly connector.

      Result

      Result Proceed to
      The voltage is as specified for every terminal. A
      Only the voltage at terminal STP2 is not as specified. B
      Only the voltage at terminal STPO is not as specified. C
      Only the voltage at terminal STP is not as specified. D
      The voltage at both terminal STPO and terminal STP are not as specified. E

    Result:  2

    B 

    See step  5

    Result:  3

    C 

    See step  16

    Result:  4

    D 

    See step  18

    Result:  5

    E 

    See step  31

    Result:  1

    A 

    See step  2

  2. PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT RELAY) 
    1. Turn the power switch off.
    2. According to the display on the Techstream, perform the Active Test Stop Light Relay.

      Refer to DATA LIST / ACTIVE TEST [11/2016 - ]

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay Stop light relay (Stop light switch assembly) ON / OFF Test possible at vehicle speed of 0 km/h (0 mph)

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display
      Stop Light Relay

      OK

      The stop lights turn on and off correctly in response to the operation of the Active Test.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  4

    Result:  1

    OK 

    See step  3

  3. CHECK FOR DTCS (PRE-COLLISION SYSTEM) 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [11/2016 - ]

      Body Electrical > Pre-Collision 2 > Clear DTCs 

    2. According to the display on the Techstream, perform the Active Test Stop Light Relay.

      Refer to DATA LIST / ACTIVE TEST [11/2016 - ]

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay Stop light relay (Stop light switch assembly) ON / OFF Test possible at vehicle speed of 0 km/h (0 mph)

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display
      Stop Light Relay
    3. Check for DTCs.

      Refer to DTC CHECK / CLEAR [11/2016 - ]

      Body Electrical > Pre-Collision 2 > Trouble Codes 

      OK

      DTC C1A4B is not output.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ] 

    Result:  2

    NG 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  COMPONENTS [02/2014 - ] 

  4. INSPECT SKID CONTROL ECU ASSEMBLY 
    1. According to the display on the Techstream, perform the Active Test Stop Light Relay.

      Refer to DATA LIST / ACTIVE TEST [11/2016 - ]

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay Stop light relay (Stop light switch assembly) ON / OFF Test possible at vehicle speed of 0 km/h (0 mph)

      Chassis > ABS/VSC/TRAC > Active Test 

      Tester Display
      Stop Light Relay
    2. Measure the voltage according to the value(s) in the table below.

      HINT: 

      Do not disconnect the stop light relay (stop light switch assembly) connector.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A83-4 (ACC) - Body ground Power switch on (IG)
      (Active test ON)      		 Below 1.5 V
      GTY733896Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Stop light relay (stop light switch assembly))

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY). Refer to  COMPONENTS [02/2014 - ] 

    Result:  2

    NG 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  COMPONENTS [02/2014 - ] 

  5. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU ASSEMBLY CONNECTOR) 
    1. Turn the power switch off.
    2. Disconnect the A63 skid control ECU assembly connector.
      GTY702319Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid control ECU assembly)
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A63-14 (STP2) - Body ground Brake pedal released Below 1.5 V
    4. Connect the A63 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  11

    Result:  1

    OK 

    See step  6

  6. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - HYBRID VEHICLE CONTROL ECU ASSEMBLY) 
    1. Turn the power switch off.
    2. Disconnect the A63 skid control ECU assembly connector.
    3. Disconnect the A85 hybrid vehicle control ECU assembly connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A63-14 (STP2) or A85-15 (STP) - Body ground Brake pedal depressed 11 to 14 V
    5. Connect the A85 hybrid vehicle control ECU assembly connector.
    6. Connect the A63 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  COMPONENTS [11/2016 - ] 

    Result:  2

    NG 

    See step  7

  7. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - VEHICLE APPROACHING SPEAKER CONTROLLER) 
    1. Turn the power switch off.
    2. Disconnect the A63 skid control ECU assembly connector.
    3. Disconnect the F17 vehicle approaching speaker controller connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A63-14 (STP2) or F17-2 (STP) - Body ground Brake pedal depressed 11 to 14 V
    5. Connect the F17 vehicle approaching speaker controller connector.
    6. Connect the A63 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE VEHICLE APPROACHING SPEAKER CONTROLLER. Refer to  COMPONENTS [02/2014 - ] 

    Result:  2

    NG 

    See step  8

  8. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - SHIFT LOCK CONTROL ECU (TRANSMISSION FLOOR SHIFT ASSEMBLY)) 
    1. Turn the power switch off.
    2. Disconnect the A63 skid control ECU assembly connector.
    3. Disconnect the F48 shift lock control ECU (transmission floor shift assembly) connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A63-14 (STP2) or F48-6 (STP) - Body ground Brake pedal depressed 11 to 14 V
    5. Connect the F48 shift lock control ECU (transmission floor shift assembly) connector.
    6. Connect the A63 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE SHIFT LOCK CONTROL ECU (TRANSMISSION FLOOR SHIFT ASSEMBLY). Refer to  COMPONENTS [02/2014 - ] 

    Result:  2

    NG 

    See step  9

  9. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) 
    1. Turn the power switch off.
    2. Disconnect the A63 skid control ECU assembly connector.
    3. Disconnect the F9 certification ECU (smart key ECU assembly) connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A63-14 (STP2) or F9-2 (STP1) - Body ground Brake pedal depressed 11 to 14 V
    5. Connect the F9 certification ECU (smart key ECU assembly) connector.
    6. Connect the A63 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  COMPONENTS [11/2016 - ] 

    Result:  2

    NG 

    See step  10

  10. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY)) 
    1. Turn the power switch off.
    2. Disconnect the A63 skid control ECU assembly connector.
    3. Disconnect the A83 stop light relay (stop light switch assembly) connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A63-14 (STP2) - A83-3 (L) Always Below 1 Ω
      A63-14 (STP2) or A83-3 (L) - Body ground Always 10 kΩ or higher
    5. Connect the A83 stop light relay (stop light switch assembly) connector.
    6. Connect the A63 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY). Refer to  COMPONENTS [02/2014 - ] 

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  11. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY)) 
    1. Turn the power switch off.
    2. Disconnect the A63 skid control ECU assembly connector.
    3. Disconnect the A83 stop light relay (stop light switch assembly) connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A63-14 (STP2) or A83-3 (L) - Body ground Brake pedal released Below 1.5 V
    5. Connect the A83 stop light relay (stop light switch assembly) connector.
    6. Connect the A63 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY). Refer to  COMPONENTS [02/2014 - ] 

    Result:  2

    NG 

    See step  12

  12. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - HYBRID VEHICLE CONTROL ECU ASSEMBLY) 
    1. Turn the power switch off.
    2. Disconnect the A63 skid control ECU assembly connector.
    3. Disconnect the A85 hybrid vehicle control ECU assembly connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A63-14 (STP2) or A85-15 (STP) - Body ground Brake pedal released Below 1.5 V
    5. Connect the A85 hybrid vehicle control ECU assembly connector.
    6. Connect the A63 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  COMPONENTS [11/2016 - ] 

    Result:  2

    NG 

    See step  13

  13. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - VEHICLE APPROACHING SPEAKER CONTROLLER) 
    1. Turn the power switch off.
    2. Disconnect the A63 skid control ECU assembly connector.
    3. Disconnect the F17 vehicle approaching speaker controller connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A63-14 (STP2) or F17-2 (STP) - Body ground Brake pedal released Below 1.5 V
    5. Connect the F17 vehicle approaching speaker controller connector.
    6. Connect the A63 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE VEHICLE APPROACHING SPEAKER CONTROLLER. Refer to  COMPONENTS [02/2014 - ] 

    Result:  2

    NG 

    See step  14

  14. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - SHIFT LOCK CONTROL ECU (TRANSMISSION FLOOR SHIFT ASSEMBLY)) 
    1. Turn the power switch off.
    2. Disconnect the A63 skid control ECU assembly connector.
    3. Disconnect the F48 shift lock control ECU (transmission floor shift assembly) connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A63-14 (STP2) or F48-6 (STP) - Body ground Brake pedal released Below 1.5 V
    5. Connect the F48 shift lock control ECU (transmission floor shift assembly) connector.
    6. Connect the A63 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE SHIFT LOCK CONTROL ECU (TRANSMISSION FLOOR SHIFT ASSEMBLY). Refer to  COMPONENTS [02/2014 - ] 

    Result:  2

    NG 

    See step  15

  15. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) 
    1. Turn the power switch off.
    2. Disconnect the A63 skid control ECU assembly connector.
    3. Disconnect the F9 certification ECU (smart key ECU assembly) connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A63-14 (STP2) or F9-2 (STP1) - Body ground Brake pedal released Below 1.5 V
    5. Connect the F9 certification ECU (smart key ECU assembly) connector.
    6. Connect the A63 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  COMPONENTS [11/2016 - ] 

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  16. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY)) 
    1. Turn the power switch off.
    2. Disconnect the A64 skid control ECU assembly connector.
    3. Disconnect the A83 stop light relay (stop light switch assembly) connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A64-4 (STPO) - A83-4 (ACC) Always Below 1 Ω
    5. Connect the A83 stop light relay (stop light switch assembly) connector.
    6. Connect the A64 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  17

  17. INSPECT STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) (POWER SOURCE CIRCUIT) 
    1. Turn the power switch off.
    2. Disconnect the A83 stop light relay (stop light switch assembly) connector.
      GTY696593Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop light relay (Stop light switch assembly))
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A83-6 (B) - Body ground Power switch ON 11 to 14 V
      A83-7 (B) - Body ground Always 11 to 14 V
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A83-2 (GND) - Body ground Always Below 1 Ω
    5. Connect the A83 stop light relay (stop light switch assembly) connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY). Refer to  COMPONENTS [02/2014 - ] 

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  18. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU ASSEMBLY CONNECTOR) 
    1. Turn the power switch off.
    2. Disconnect the A64 skid control ECU assembly connector.
      GTY718330Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid control ECU assembly)
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A64-16 (STP) - Body ground Brake pedal released Below 1.5 V
    4. Connect the A64 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  25

    Result:  1

    OK 

    See step  19

  19. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY LH) 
    1. Turn the power switch off.
    2. Disconnect the A64 skid control ECU assembly connector.
    3. Disconnect the M30 rear combination light assembly LH connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A64-16 (STP) or M30-2 (STP) - Body ground Brake pedal depressed 11 to 14 V
    5. Connect the M30 rear combination light assembly LH connector.
    6. Connect the A64 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH. Refer to  COMPONENTS [11/2016 - ] 

    Result:  2

    NG 

    See step  20

  20. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY RH) 
    1. Turn the power switch off.
    2. Disconnect the A64 skid control ECU assembly connector.
    3. Disconnect the M32 rear combination light assembly RH connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A64-16 (STP) or M32-2 (STP) - Body ground Brake pedal depressed 11 to 14 V
    5. Connect the M32 rear combination light assembly RH connector.
    6. Connect the A64 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE REAR COMBINATION LIGHT ASSEMBLY RH. Refer to  COMPONENTS [11/2016 - ] 

    Result:  2

    NG 

    See step  21

  21. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - CENTER STOP LIGHT ASSEMBLY) 
    1. Turn the power switch off.
    2. Disconnect the A64 skid control ECU assembly connector.
    3. Disconnect the Y1 center stop light assembly connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A64-16 (STP) or Y1-2 (B) - Body ground Brake pedal depressed 11 to 14 V
    5. Connect the Y1 center stop light assembly connector.
    6. Connect the A64 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE CENTER STOP LIGHT ASSEMBLY. Refer to  COMPONENTS [02/2014 - ] 

    Result:  2

    NG 

    See step  22

  22. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - REAR LIGHT ASSEMBLY LH) 
    1. Turn the power switch off.
    2. Disconnect the A64 skid control ECU assembly connector.
    3. Disconnect the X29 rear light assembly LH connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A64-16 (STP) or X29-2 (B) - Body ground Brake pedal depressed 11 to 14 V
    5. Connect the X29 rear light assembly LH connector.
    6. Connect the A64 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE REAR LIGHT ASSEMBLY LH. Refer to  COMPONENTS [11/2016 - ] 

    Result:  2

    NG 

    See step  23

  23. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - REAR LIGHT ASSEMBLY RH) 
    1. Turn the power switch off.
    2. Disconnect the A64 skid control ECU assembly connector.
    3. Disconnect the X35 rear light assembly RH connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A64-16 (STP) or X35-2 (B) - Body ground Brake pedal depressed 11 to 14 V
    5. Connect the X35 rear light assembly RH connector.
    6. Connect the A64 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE REAR LIGHT ASSEMBLY RH. Refer to  COMPONENTS [11/2016 - ] 

    Result:  2

    NG 

    See step  24

  24. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY)) 
    1. Turn the power switch off.
    2. Disconnect the A64 skid control ECU assembly connector.
    3. Disconnect the A83 stop light relay (stop light switch assembly) connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A64-16 (STP) - A83-1 (OUT) Always Below 1 Ω
      A64-16 (STP) or A83-1 (OUT) - Body ground Always 10 kΩ or higher
    5. Connect the A83 stop light relay (stop light switch assembly) connector.
    6. Connect the A64 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY). Refer to  COMPONENTS [02/2014 - ] 

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  25. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY)) 
    1. Turn the power switch off.
    2. Disconnect the A64 skid control ECU assembly connector.
    3. Disconnect the A83 stop light relay (stop light switch assembly) connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A64-16 (STP) or A83-1 (OUT) - Body ground Brake pedal released Below 1.5 V
    5. Connect the A83 stop light relay (stop light switch assembly) connector.
    6. Connect the A64 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY). Refer to  COMPONENTS [02/2014 - ] 

    Result:  2

    NG 

    See step  26

  26. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY LH) 
    1. Turn the power switch off.
    2. Disconnect the A64 skid control ECU assembly connector.
    3. Disconnect the M30 rear combination light assembly LH connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A64-16 (STP) or M30-2 (STP) - Body ground Brake pedal released Below 1.5 V
    5. Connect the M30 rear combination light assembly LH connector.
    6. Connect the A64 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH. Refer to  COMPONENTS [11/2016 - ] 

    Result:  2

    NG 

    See step  27

  27. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY RH) 
    1. Turn the power switch off.
    2. Disconnect the A64 skid control ECU assembly connector.
    3. Disconnect the M32 rear combination light assembly RH connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A64-16 (STP) or M32-2 (STP) - Body ground Brake pedal released Below 1.5 V
    5. Connect the M32 rear combination light assembly RH connector.
    6. Connect the A64 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE REAR COMBINATION LIGHT ASSEMBLY RH. Refer to  COMPONENTS [11/2016 - ] 

    Result:  2

    NG 

    See step  28

  28. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - CENTER STOP LIGHT ASSEMBLY) 
    1. Turn the power switch off.
    2. Disconnect the A64 skid control ECU assembly connector.
    3. Disconnect the Y1 center stop light assembly connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A64-16 (STP) or Y1-2 (B) - Body ground Brake pedal released Below 1.5 V
    5. Connect the Y1 center stop light assembly connector.
    6. Connect the A64 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE CENTER STOP LIGHT ASSEMBLY. Refer to  COMPONENTS [02/2014 - ] 

    Result:  2

    NG 

    See step  29

  29. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - REAR LIGHT ASSEMBLY LH) 
    1. Turn the power switch off.
    2. Disconnect the A64 skid control ECU assembly connector.
    3. Disconnect the X29 rear light assembly LH connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A64-16 (STP) or X29-2 (B) - Body ground Brake pedal released Below 1.5 V
    5. Connect the X29 rear light assembly LH connector.
    6. Connect the A64 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE REAR LIGHT ASSEMBLY LH. Refer to  COMPONENTS [11/2016 - ] 

    Result:  2

    NG 

    See step  30

  30. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - REAR LIGHT ASSEMBLY RH) 
    1. Turn the power switch off.
    2. Disconnect the A64 skid control ECU assembly connector.
    3. Disconnect the X35 rear light assembly RH connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A64-16 (STP) or X35-2 (B) - Body ground Brake pedal released Below 1.5 V
    5. Connect the X35 rear light assembly RH connector.
    6. Connect the A64 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE REAR LIGHT ASSEMBLY RH. Refer to  COMPONENTS [11/2016 - ] 

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  31. INSPECT STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) (POWER SOURCE CIRCUIT) 
    1. Turn the power switch off.
    2. Disconnect the A83 stop light relay (stop light switch assembly) connector.
      GTY696593Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop light relay (Stop light switch assembly))
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A83-6 (B) - Body ground Power switch ON 11 to 14 V
      A83-7 (B) - Body ground Always 11 to 14 V
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A83-2 (GND) - Body ground Always Below 1 Ω
    5. Connect the A83 stop light relay (stop light switch assembly) connector.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  32

  32. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY)) 
    1. Turn the power switch off.
    2. Disconnect the A64 skid control ECU assembly connector.
    3. Disconnect the A83 stop light relay (stop light switch assembly) connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A64-4 (STPO) or A83-4 (ACC) - Body ground Always 10 kΩ or higher
    5. Connect the A83 stop light relay (stop light switch assembly) connector.
    6. Connect the A64 skid control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY). Refer to  COMPONENTS [02/2014 - ] 

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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