CRUISE CONTROL SYSTEM Stop Light Switch Circuit

DESCRIPTION

When the brake pedal is released, terminal STP of the ECM receives positive (+) battery voltage through the ECU IG2 fuse. While depressing the brake pedal, the stop light switch sends a signal to terminals STP and ST1- of the ECM. The ECM cancels cruise control drive when terminal STP receives the signal.

WIRING DIAGRAM

A004IXAE03

CAUTION / NOTICE / HINT

Tech Tips

Stop light switch assembly conditions can be checked using the GTS.


  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON.

  3. Turn the GTS on.

  4. Enter the following menus: Powertrain / Cruise Control / Data List / Stop Light Switch 1 and Stop Light Switch 2.

    Cruise Control
    Brake Pedal Operation Stop Light Switch 1 Stop Light Switch 2
    Depressed ON ON
    Released OFF OFF

PROCEDURE


  1. CHECK ECM (TERMINAL VOLTAGE)


    1. A004HF8E03
      Text in Illustration
      *a

      Component with harness connected

      (ECM)

      Turn the ignition switch to ON.

    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Condition Specified Condition
      A33-7 (STP) - Body ground Brake pedal released 11 to 14 V
      Brake pedal depressed Below 1 V

    NG

    CHECK TERMINAL VOLTAGE (POWER SOURCE OF STOP LIGHT SWITCH ASSEMBLY) Click here

    OK

  2. CHECK ECM (TERMINAL VOLTAGE)


    1. A004JXGE03
      Text in Illustration
      *a

      Component with harness connected

      (ECM)

      Turn the ignition switch to ON.

    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Condition Specified Condition
      A33-3 (ST1-) - Body ground Brake pedal depressed 11 to 14 V
      Brake pedal released Below 1 V

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    CHECK TERMINAL VOLTAGE (POWER SOURCE OF STOP LIGHT SWITCH ASSEMBLY) Click here

  3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF STOP LIGHT SWITCH ASSEMBLY)


    1. A004I0SE04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

      Disconnect the stop light switch assembly connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Condition Specified Condition
      A22-3 - Body ground Ignition switch ON 11 to 14 V

    NG

    INSPECT ECM POWER SOURCE CIRCUIT Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (ECM - STOP LIGHT SWITCH ASSEMBLY)


    1. Disconnect the ECM connector.

    2. Disconnect the stop light switch assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      A33-7 (STP) - A22-4 Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      A33-7 (STP) or A22-4 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  5. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Inspect the stop light switch assembly Click here.


    OK

    REPLACE ECM Click here

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

  6. CHECK TERMINAL VOLTAGE (POWER SOURCE OF STOP LIGHT SWITCH ASSEMBLY)


    1. A004I0SE04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

      Disconnect the stop light switch assembly connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Condition Specified Condition
      A22-1 - Body ground Always 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (NOISE FILTER - STOP LIGHT SWITCH ASSEMBLY) Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (ECM - STOP LIGHT SWITCH ASSEMBLY)


    1. Disconnect the ECM connector.

    2. Disconnect the stop light switch assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      A33-3 (ST1-) - A22-2 Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      A33-3 (ST1-) or A22-2 - Body ground Always 10 kΩ or higher

    NG

    CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - NOISE FILTER) Click here

    OK

  8. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Inspect the stop light switch assembly Click here.


    OK

    REPLACE ECM Click here

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

  9. CHECK HARNESS AND CONNECTOR (NOISE FILTER - STOP LIGHT SWITCH ASSEMBLY)


    1. Disconnect the stop light switch assembly connector.

    2. Disconnect the noise filter connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      A22-1 - A13-2 Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      A22-1 or A13-2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  10. INSPECT NOISE FILTER


    1. Inspect the noise filter Click here.


    OK

    REPAIR OR REPLACE HARNESS AND CONNECTOR (NOISE FILTER - BATTERY)

    NG

    REPLACE NOISE FILTER Click here

  11. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - NOISE FILTER)


    1. Disconnect the stop light switch assembly connector.

    2. Disconnect the noise filter connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      A22-2 - A13-1 Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      A22-2 or A13-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  12. INSPECT NOISE FILTER


    1. Inspect the noise filter Click here.


    NG

    REPLACE NOISE FILTER Click here

    OK

  13. CHECK HARNESS AND CONNECTOR (ECM - NOISE FILTER)


    1. Disconnect the ECM connector.

    2. Disconnect the noise filter connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      A33-3 (ST1-) - A13-4 Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      A33-3 (ST1-) or A13-4 - Body ground Always 10 kΩ or higher

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR