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 hybrid vehicle control ECU assembly. When the hybrid vehicle control ECU assembly 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 hybrid vehicle control ECU assembly through the STOP fuse and the stop light switch assembly, and the hybrid vehicle control ECU assembly turns the cruise control system off.

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

  • Stop light switch assembly

  • Harness or connector

  • Hybrid vehicle control ECU assembly

WIRING DIAGRAM

B004C50E01

CAUTION / NOTICE / HINT

Note


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

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

    Click here

PROCEDURE


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


    1. B004CRIC18
      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

      Disconnect the A4 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
      A4-3 (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
      A4-1 (B) - Body ground Always 11 to 15.5 V
      A4-5 (B) - Body ground Power switch on (IG) 11 to 14 V
      A4-5 (B) - Body ground Power switch off Below 1 V

    4. Connect the A4 stop light switch assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)

    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 (HYBRID VEHICLE CONTROL ECU ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)


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

    2. Disconnect the A22 hybrid vehicle control ECU assembly connector.

    3. Disconnect the A4 stop light switch assembly connector.

    4. Disconnect the A10 skid control ECU assembly connector.

    5. Disconnect the P75 shift control ECU connector.

    6. Disconnect the X99 No. 3 semiconductor power integration ECU connector.

    7. Disconnect the X23 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A22-21 (ST1-) - A4-4 (L) Always Below 1 Ω
      A22-8 (STP) - A4-2 (L) Always Below 1 Ω
      A22-21 (ST1-) or A4-4 (L) - Body ground Always 10 kΩ or higher
      A22-8 (STP) or A4-2 (L) - Body ground Always 10 kΩ or higher

    9. Connect the X23 certification ECU (smart key ECU assembly) connector.

    10. Connect the X99 No. 3 semiconductor power integration ECU connector.

    11. Connect the P75 shift control ECU connector.

    12. Connect the A10 skid control ECU assembly connector.

    13. Connect the A4 stop light switch assembly connector.

    14. Connect the A22 hybrid vehicle control ECU assembly connector.

    15. Connect the cable from the negative (-) auxiliary battery terminal.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)