DYNAMIC RADAR 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 dynamic radar 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 dynamic radar cruise control system off.

DTC No. Detection Item DTC Detection Condition Trouble Area
P057162 Brake Switch "A" Signal Compare Failure

    w/o Full-speed range following function:

  • While the vehicle speed is 36 km/h (22 mph) or more 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.


    w/ Full-speed range following function:

  • While the vehicle speed is 5 km/h (3 mph) or more 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

  • Harness or connector

  • ECM

WIRING DIAGRAM

A01RCQDE14
A01RCQDE15

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.

PROCEDURE


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


    1. A01RD62C45
      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

      Disconnect the A55 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
      A55-3 (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
      A55-1 (B) - Body ground Always 11 to 14 V
      A55-5 (B) - Body ground Engine switch on (IG) 11 to 14 V
      A55-5 (B) - Body ground Engine switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG
    OK
  2. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Inspect the stop light switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

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


    1. Disconnect the ECM connector.

    2. Disconnect the stop light switch assembly connector.

    3. Disconnect the brake actuator assembly connector.

    4. Disconnect the certification ECU connector.

    5. Disconnect the transmission floor shift assembly connector.

    6. Disconnect the semiconductor PWR integration ECU connector.

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

      Standard Resistance
      for 2GR-FKS
      Tester Connection Condition Specified Condition
      A37-42 (ST1-) - A55-4 (L) Always Below 1 Ω
      A37-27 (STP) - A55-2 (L) Always Below 1 Ω
      A37-42 (ST1-) or A55-4 (L) - Body ground Always 10 kΩ or higher
      A37-27 (STP) or A55-2 (L) - Body ground Always 10 kΩ or higher
      for 8AR-FTS
      Tester Connection Condition Specified Condition
      A46-10 (ST1-) - A55-4 (L) Always Below 1 Ω
      A46-9 (STP) - A55-2 (L) Always Below 1 Ω
      A46-10 (ST1-) or A55-4 (L) - Body ground Always 10 kΩ or higher
      A46-9 (STP) or A55-2 (L) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK
    NG