CRUISE CONTROL SYSTEM, Diagnostic DTC:P057162

DTC Code DTC Name
P057162 Brake Switch "A" Signal Compare Failure

DESCRIPTION

When the brake pedal is depressed, the stop light switch assembly outputs a signal to the ECM. When the ECM receives the signal, it cancels control of vehicle speed by the cruise control system. The fail-safe function operates to enable normal operation even if there is a malfunction in the stop light signal circuit. The cancellation condition occurs when voltage is applied to terminal STP. When the brake pedal is depressed, voltage is applied to terminal STP of the ECM through the STOP fuse and the stop light switch assembly, and the ECM turns the cruise control system off.

DTC No. Detection Item DTC Detection Condition Trouble Area
P057162 Brake Switch "A" Signal Compare Failure When the engine switch is on (IG) and the cruise control system is operating, the voltage of the STP and ST1- terminals of the ECM are less than 1 V for 0.5 seconds or more.

  • Stop light switch assembly

  • Harness or connector

  • ECM

WIRING DIAGRAM

B0069TWE01

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • Before replacing the ECM refer to Service Bulletin.

  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY AND BODY GROUND)


    1. B006FVSC24
      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

      Disconnect the A3 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
      A3-3 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A3-1 (B) - Body ground Always 11 to 14 V
      A3-5 (B) - Body ground Engine switch on (IG) 11 to 14 V
      A3-5 (B) - Body ground Engine switch off Below 1 V

    4. Connect the A3 stop light switch assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Inspect the stop light switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the A56*1 or A95*2 ECM connector.

    3. Disconnect the A3 stop light switch assembly connector.

    4. Disconnect the A9*3 skid control ECU (brake actuator assembly) connector.

    5. Disconnect the A12*4 skid control ECU assembly connector.

    6. Disconnect the G82 shift control ECU connector.

    7. Disconnect the L111 No. 3 semiconductor power integration ECU connector.

    8. Disconnect the L31 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      for 8GR-FKS
      Tester Connection Condition Specified Condition
      A56-42 (ST1-) - A3-4 (L) Always Below 1 Ω
      A56-27 (STP) - A3-2 (L) Always Below 1 Ω
      A56-42 (ST1-) or A3-4 (L) - Body ground Always 10 kΩ or higher
      A56-27 (STP) or A3-2 (L) - Body ground Always 10 kΩ or higher
      for V35A-FTS
      Tester Connection Condition Specified Condition
      A95-13 (ST1-) - A3-4 (L) Always Below 1 Ω
      A95-14 (STP) - A3-2 (L) Always Below 1 Ω
      A95-13 (ST1-) or A3-4 (L) - Body ground Always 10 kΩ or higher
      A95-14 (STP) or A3-2 (L) - Body ground Always 10 kΩ or higher

    10. Connect the L31 certification ECU (smart key ECU assembly) connector.

    11. Connect the L111 No. 3 semiconductor power integration ECU connector.

    12. Connect the G82 shift control ECU connector.

    13. Connect the A12*4 skid control ECU assembly connector.

    14. Connect the A9*3 skid control ECU (brake actuator assembly) connector.

    15. Connect the A3 stop light switch assembly connector.

    16. Connect the A56*1 or A95*2 ECM connector.

    17. Connect the cable from the negative (-) battery terminal.


      • *1: for 8GR-FKS

      • *2: for V35A-FTS

      • *3: w/ Vacuum Brake Booster

      • *4: w/o Vacuum Brake Booster

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM for 8GR-FKS: Click here
    REPLACE ECM for V35A-FTS: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR