Last Modified: 11-20-2023 6.11:8.1.0 Doc ID: RM1000000012SJK
Model Year Start: 2018 Model: Camry Prod Date Range: [03/2017 - 06/2017]
Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: P057162; Brake Switch "A" Signal Compare Failure; 2018 MY Camry [03/2017 - 06/2017]

DTC

P057162

Brake Switch "A" Signal Compare Failure

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 terminal STP. When the brake is applied, voltage is normally applied to 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 ignition switch is ON and the dynamic radar cruise control system is operating, voltage of STP terminal and that of ST1- terminal of 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.

    w/o Smart Key System: 2018 - 2019 MY Camry [03/2017 - 09/2019]; THEFT DETERRENT / KEYLESS ENTRY: IMMOBILISER SYSTEM (w/o Smart Key System): REGISTRATION

    w/ Smart Key System: 2018 - 2019 MY Camry [03/2017 - 09/2019]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function): REGISTRATION

PROCEDURE

1.

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

(a) Disconnect the A37 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

A37-2 (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

A37-7 (B) - Body ground

Always

11 to 14 V

A37-6 (B) - Body ground

Ignition switch ON

11 to 14 V

A37-6 (B) - Body ground

Ignition switch off

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

INSPECT STOP LIGHT SWITCH ASSEMBLY

(a) Inspect the stop light switch assembly.

Click here 2018 - 2020 MY Camry [03/2017 - 10/2020]; LIGHTING (EXT): STOP LIGHT SWITCH: ON-VEHICLE INSPECTION

NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

OK

3.

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

(a) Disconnect the A24 ECM connector.

(b) Disconnect the A37 stop light switch assembly connector.

(c) Disconnect the A33 skid control ECU (brake actuator assembly) connector.

(d) Disconnect the R8 certification ECU (smart key ECU assembly) connector (w/ Smart Key System).

(e) Disconnect the K28 shift lock control ECU (shift lock control unit assembly) connector (w/o Smart Key System).

(f) Disconnect the K27 shift lock control ECU (shift lock control unit assembly) connector (w/ Smart Key System).

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A24-22 (ST1-) - A37-5 (L)

Always

Below 1 Ω

A24-21 (STP) - A37-3 (L)

Always

Below 1 Ω

A24-22 (ST1-) or A37-5 (L) - Body ground

Always

10 kΩ or higher

A24-21 (STP) or A37-3 (L) - Body ground

Always

10 kΩ or higher

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR