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 hybrid vehicle control ECU. When the hybrid vehicle control ECU 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 hybrid vehicle control ECU through the STOP fuse and the stop light switch assembly, and the hybrid vehicle control ECU 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 hybrid vehicle control ECU 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 hybrid vehicle control ECU are less than 1 V for approximately 0.5 seconds or more.

  • Stop light switch assembly

  • Harness or connector

  • Hybrid vehicle control ECU

WIRING DIAGRAM

A003NC1E06

CAUTION / NOTICE / HINT

Note


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

  • Before replacing the hybrid vehicle control ECU, refer to Service Bulletin.

PROCEDURE


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


    1. A003OYKC01
      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

      Disconnect the A38 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
      A38-2 (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
      A38-7 (B) - Body ground Always 11 to 14 V
      A38-6 (B) - Body ground Power switch on (IG) 11 to 14 V
      A38-6 (B) - Body ground Power 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 (HYBRID VEHICLE CONTROL ECU - STOP LIGHT SWITCH ASSEMBLY)


    1. Disconnect the A41 and I2 hybrid vehicle control ECU connector.

    2. Disconnect the A38 stop light switch assembly connector.

    3. Disconnect the A32 skid control ECU (brake booster with master cylinder assembly) connector.

    4. Disconnect the N54 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I2-28 (ST1-) - A38-5 (L) Always Below 1 Ω
      A41-7 (STP) - A38-3 (L) Always Below 1 Ω
      I2-28 (ST1-) or A38-5 (L) - Body ground Always 10 kΩ or higher
      A41-7 (STP) or A38-3 (L) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR