DYNAMIC RADAR CRUISE CONTROL SYSTEM(for 6AR-FSE), 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 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 terminal STP. When the brake is applied, voltage is normally applied to 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. DTC Detection Condition Trouble Area
P057162 When the engine switch is on (IG) and the dynamic radar cruise control system is operating, voltage of STP terminal and that of ST1- terminal of ECM are less than 1 V for approximately 0.5 seconds or more.

  • Stop light switch assembly

  • Stop light switch circuit

  • ECM

WIRING DIAGRAM

Refer to P057113 Click here.

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A01W2SQE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

      Disconnect the A28 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
      A28-1 (B) - A28-3 (GND) Always 11 to 14 V
      A28-5 (B) - A28-3 (GND) Engine switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A28-3 (GND) - Body ground Always Below 1 Ω

    4. Reconnect the A28 stop light switch assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. A01W0FGE01
      Text in Illustration
      *a

      Component with harness connected

      (Stop Light Switch Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A28-2 (L) - A28-3 (GND) Engine switch off, brake pedal not depressed Below 1 V
      Engine switch off, brake pedal depressed 11 to 14 V
      A28-4 (L) - A28-3 (GND) Engine switch on (IG), brake pedal not depressed 11 to 14 V
      Engine switch on (IG), brake pedal depressed Below 1 V

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the A75 ECM connector.

    2. Disconnect the A28 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
      A75-9 (STP) - A28-2 (L) Always Below 1 Ω
      A75-10 (ST1-) - A28-4 (L) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A75-9 (STP) or A28-2 (L) - Body ground Always 10 kΩ or higher
      A75-10 (ST1-) or A28-4 (L) - Body ground Always 10 kΩ or higher

    4. Reconnect the A28 stop light switch assembly connector.

    5. Reconnect the A75 ECM connector.


    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR