Lexus ES manuals

Lexus ES: 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

Engine

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 A43 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

A43-2 (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

A43-7 (B) - Body ground

Always

11 to 14 V

A43-6 (B) - Body ground

Engine switch on (IG)

11 to 14 V

A43-6 (B) - Body ground

Engine switch off

Below 1 V

(d) Connect the A43 stop light switch assembly connector.

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 (ECM - STOP LIGHT SWITCH ASSEMBLY)

(a) Disconnect the A25 ECM connector.

(b) Disconnect the A43 stop light switch assembly connector.

(c) Disconnect the A40 skid control ECU (brake actuator assembly) connector.

(d) Disconnect the N9 certification ECU (smart key ECU assembly) connector.

(e) Disconnect the G25 shift lock control ECU (shift lock control unit assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A25-42 (ST1-) - A43-5 (L)

Always

Below 1 Ω

A25-27 (STP) - A43-3 (L)

Always

Below 1 Ω

A25-42 (ST1-) or A43-5 (L) - Body ground

Always

10 kΩ or higher

A25-27 (STP) or A43-3 (L) - Body ground

Always

10 kΩ or higher

(g) Connect the G25 shift lock control ECU (shift lock control unit assembly) connector.

(h) Connect the N9 certification ECU (smart key ECU assembly) connector.

(i) Connect the A40 skid control ECU (brake actuator assembly) connector.

(j) Connect the A43 stop light switch assembly connector.

(k) Connect the A25 ECM connector.

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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