Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Brake Switch "A" Signal Compare Failure (P057162)

DESCRIPTION

When the brake pedal is depressed, the stop light switch assembly sends a signal to the ECM. When the ECM receives this signal, it cancels the dynamic radar cruise control. The fail-safe function operates to enable normal driving even if there is a malfunction in the stop light signal circuit. The cancellation condition occurs when voltage is applied to the terminal STP. When the brake is applied, voltage is normally applied to the terminal STP of the ECM through the STOP fuse and the stop light switch assembly, and the ECM turns the dynamic radar cruise control system off.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

P057162

Brake Switch "A" Signal Compare Failure

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

  • Stop light switch assembly
  • Harness or connector
  • ECM

Does not come on

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 A33 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

A33-2 (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

A33-7 (B) - Body ground

Always

11 to 14 V

A33-6 (B) - Body ground

Engine switch on (IG)

11 to 14 V

A33-6 (B) - Body ground

Engine switch off

Below 1 V

(d) Connect the A33 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 A18 ECM connector.

(b) Disconnect the A33 stop light switch assembly connector.

(c) Disconnect the A28 skid control ECU (brake actuator assembly) connector.

(d) Disconnect the K10 certification ECU (smart key ECU assembly) connector.

(e) Disconnect the G21 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

A18-42 (ST1-) - A33-5 (L)

Always

Below 1 Ω

A18-27 (STP) - A33-3 (L)

Always

Below 1 Ω

A18-42 (ST1-) or A33-5 (L) - Body ground

Always

10 kΩ or higher

A18-27 (STP) or A33-3 (L) - Body ground

Always

10 kΩ or higher

(g) Connect the G21 shift lock control ECU (shift lock control unit assembly) connector.

(h) Connect the K10 certification ECU (smart key ECU assembly) connector.

(i) Connect the A28 skid control ECU (brake actuator assembly) connector.

(j) Connect the A33 stop light switch assembly connector.

(k) Connect the A18 ECM connector.

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Brake Switch "A" Circuit Open (P057113)

    Cruise Control System Internal Failure (P057504,P057549)

    See More:

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