Click here

DYNAMIC RADAR CRUISE CONTROL SYSTEM(except 2AR-FE), Diagnostic DTC:P057162

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

DESCRIPTION

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

DTC No. Detection Item DTC Detection Condition Trouble Area
P057162 Brake Switch "A" Signal Compare Failure While the ignition switch is ON and the dynamic radar cruise control system is operating, voltage of the STP terminal and that of the ST1- terminal of the ECM are less than 1 V for approximately 0.5 seconds or more.

  • Stop light switch assembly

  • Harness or connector

  • ECM
Click here

WIRING DIAGRAM

Click here

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.

Click here

PROCEDURE


  1. Click here

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


    1. B006YXEC06
      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

      Disconnect the A37 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
      A37-2 (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
      A37-7 (B) - Body ground Always 11 to 14 V
      A37-6 (B) - Body ground Ignition switch ON 11 to 14 V
      A37-6 (B) - Body ground Ignition switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  2. Click here

    INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Inspect the stop light switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

  3. Click here

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


    1. Disconnect the A24 ECM connector (for A25A-FKS).

    2. Disconnect the A23 ECM connector (for 2GR-FKS).

    3. Disconnect the A37 stop light switch assembly connector.

    4. Disconnect the A34 skid control ECU (brake actuator assembly) connector.

    5. Disconnect the R8 certification ECU (smart key ECU assembly) connector.

    6. Disconnect the K27 shift lock control ECU (shift lock control unit assembly) connector.

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

      Standard Resistance (for A25A-FKS)
      Tester Connection Condition Specified Condition
      A24-22 (ST1-) - A37-5 (L) Always Below 1 Ω
      A24-21 (STP) - A37-3 (L) Always Below 1 Ω
      A24-22 (ST1-) or A37-5 (L) - Body ground Always 10 kΩ or higher
      A24-21 (STP) or A37-3 (L) - Body ground Always 10 kΩ or higher
      Standard Resistance (for 2GR-FKS)
      Tester Connection Condition Specified Condition
      A23-42 (ST1-) - A37-5 (L) Always Below 1 Ω
      A23-27 (STP) - A37-3 (L) Always Below 1 Ω
      A23-42 (ST1-) or A37-5 (L) - Body ground Always 10 kΩ or higher
      A23-27 (STP) or A37-3 (L) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE ECM for A25A-FKS:Click here

      REPLACE ECM for 2GR-FKS:Click here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR