Toyota Camry owners & service manuals

Toyota Camry (XV70): 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

DTC Output from

P057162

Brake Switch "A" Signal Compare Failure

When the ignition switch is ON 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

Cruise Control

WIRING DIAGRAM

for A25A-FKS

for 2GR-FKS

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.

    w/ Smart Key System: Click here

    w/o Smart Key System: Click here

PROCEDURE

1.

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

(a) Disconnect the 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

A81-2 (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

A81-7 (B) - Body ground

Always

11 to 14 V

A81-6 (B) - Body ground

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

INSPECT 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 A81 stop light switch assembly connector.

(b) Disconnect the A24*1 or A21*2 ECM connector.

  • *1: for A25A-FKS
  • *2: for 2GR-FKS

(c) Disconnect each ECU connector.

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

Standard Resistance:

for A25A-FKS:

Tester Connection

Condition

Specified Condition

A81-3 (L) - A24-21 (STP)

Always

Below 1 Ω

A81-5 (L) - A24-22 (ST1-)

Always

Below 1 Ω

A81-3 (L) or A24-21 (STP) - Body ground

Always

10 kΩ or higher

A81-5 (L) or A24-22 (ST1-) - Body ground

Always

10 kΩ or higher

for 2GR-FKS:

Tester Connection

Condition

Specified Condition

A81-3 (L) - A21-27 (STP)

Always

Below 1 Ω

A81-5 (L) - A24-42 (ST1-)

Always

Below 1 Ω

A81-3 (L) or A21-27 (STP) - Body ground

Always

10 kΩ or higher

A81-5 (L) or A24-42 (ST1-) - Body ground

Always

10 kΩ or higher

OK

REPLACE ECM

for A25A-FKS: Click here

for 2GR-FKS: Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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