Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Brake Switch "A" Signal Compare Failure (P057162)

DESCRIPTION

When the brake pedal is depressed, the stop light switch assembly outputs a signal to the ECM. The ECM uses this signal to control cancellation of vehicle speed by the dynamic radar cruise control. When the ECM determines that terminals STP and ST1 of the stop light switch assembly are both less than 1 V, DTC P057162 is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

P057162

Brake Switch "A" Signal Compare Failure

When the engine switch is on (IG) and the dynamic radar cruise control system is operating, the ECM detects that the voltage at terminal STP and ST1- are both less than 1 V for approximately 0.5 seconds or more.

  • Harness or connector
  • Stop light switch assembly
  • ECM

Does not come on

Cruise Control

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the ECM, refer to Registration.

    Click here

PROCEDURE

1.

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

(a) Disconnect the A55 stop light switch assembly connector.

*a

Front view of wire harness connector

(to Stop Light Switch Assembly)

(b) 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

(c) 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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

INSPECT STOP LIGHT SWITCH ASSEMBLY

(a) Inspect the stop light switch assembly.

Click here

NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

OK

3.

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

(a) Disconnect the A55 stop light switch assembly connector.

(b) Disconnect the A37 ECM connector.

(c) Disconnect each ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A55-2 (L) - A37-27 (STP)

Always

Below 1 Ω

A55-4 (L) - A37-42 (ST1-)

Always

Below 1 Ω

A55-2 (L) or A37-27 (STP) - Body ground

Always

10 kΩ or higher

A55-4 (L) or A37-42 (ST1-) - Body ground

Always

10 kΩ or higher

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Brake Switch "A" Circuit Open (P057113)
    DESCRIPTION When the brakes are applied by the dynamic radar cruise control system, the skid control ECU (brake actuator assembly) operates the stop light switch assembly (stop light control relay) to ...

    Cruise Control System Internal Failure (P057504,P057549)
    DESCRIPTION When the ECM detects an internal malfunction, DTC P057504 or P057549 is stored. DTC No. Detection Item DTC Detection Condition Trouble Area MIL DTC Output from P057504 C ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Seat Heater Switch (for Rear Side): Removal
    REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during rear seat heater switch removal/installation are shown below. Necessary Procedure After Parts Removed/In ...

    Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Power Mirror Control System (w/ Memory): Precaution
    PRECAUTION PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL NOTICE: When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected. System Name See Procedure Lane Control System Pre-collision Sys ...

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

    © 2024 Copyright www.lexusrx.net
    0.0158