Toyota Camry (XV70): Brake Switch "A" Signal Compare Failure (P057162)

Toyota Camry Repair Manual XV70 (2018-2024) / Engine, Hybrid System / Cruise Control / Dynamic Radar Cruise Control System / 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

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
A81-6 (B) - Body ground	Ignition switch off	Below 1 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	INSPECT STOP LIGHT SWITCH ASSEMBLY

Click here

REPLACE STOP LIGHT SWITCH ASSEMBLY

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

(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

REPLACE ECM

for A25A-FKS: Click here

for 2GR-FKS: Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR

SEE MORE:

How To Proceed With Troubleshooting

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On-vehicle Inspection

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Toyota Camry (XV70): Brake Switch "A" Signal Compare Failure (P057162)

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