CRUISE CONTROL SYSTEM(except 2AR-FE), 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 control of vehicle speed by the cruise control system. The fail-safe function operates to enable normal driving even if there is a malfunction in the stop light switch signal circuit. The cancellation condition occurs when voltage is applied to the terminal STP. When the brake pedal is depressed, voltage is applied to the terminal STP of the ECM through the STOP fuse and the stop light switch assembly, and the ECM cancels control of vehicle speed by the cruise control system.

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

B0085Z4E14

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. B0088AIC06
      *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 Engine switch on (IG) 11 to 14 V
      A37-6 (B) - Body ground Engine switch off Below 1 V
      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 A23 ECM connector.

    2. Disconnect the A37 stop light switch assembly connector.

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

    4. Disconnect the R8 certification ECU (smart key ECU assembly) connector (w/ Smart Entry and Start System).

    5. Disconnect the K28 shift lock control ECU (shift lock control unit assembly) connector (w/o Smart Entry and Start System).

    6. Disconnect the K27 shift lock control ECU (shift lock control unit assembly) connector (w/ Smart Entry and Start System).

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

      Standard Resistance
      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 Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR