Toyota Yaris: Dynamic Radar Cruise Control System / Brake Switch "A" Signal Compare Failure (P057162)

Toyota Yaris XP210 (2020-2023) Reapir and Service Manual / 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

Radar Cruise1

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 Service Bulletin.

PROCEDURE

1.

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

(a) Disconnect the A63 stop light switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A63-2 (GND) - Body ground

Always

Below 1 Ω

(c) Connect the A63 stop light switch assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

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

(a) Disconnect the stop light switch assembly connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A63-7 (B) - Body ground

Always

11 to 14 V

A63-6 (B) - Body ground

Ignition switch ON

11 to 14 V

A63-6 (B) - Body ground

Ignition switch off

Below 1 V

*a

Front view of wire harness connector

(to Stop Light Switch Assembly)

(c) Connect the A63 stop light switch assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

INSPECT STOP LIGHT SWITCH ASSEMBLY

Click here

NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

OK

4.

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

(a) Disconnect the A106 ECM connector.

(b) Disconnect the A63 stop light switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A106-22 (ST1-) - A63-5 (L)

Always

Below 1 Ω

A106-21 (STP) - A63-3 (L)

Always

Below 1 Ω

A106-22 (ST1-) or A63-5 (L) - Body ground

Always

10 kΩ or higher

A106-21 (STP) or A63-3 (L) - Body ground

Always

10 kΩ or higher

(d) Connect the A63 stop light switch assembly connector.

(e) Connect the A106 ECM connector.

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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    Categories

    Break-In Period

    No special break-in is necessary, but a few precautions in the first 600 miles (1,000 km) may add to the performance, economy, and life of the vehicle.

    Do not race the engine. Do not maintain one constant speed, either slow or fast, for a long period of time. Do not drive constantly at full-throttle or high engine rpm for extended periods of time. Avoid unnecessary hard stops. Avoid full-throttle starts.

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