Toyota Tacoma 2015-2018 Service Manual: Brake Switch "A" Signal Compare Failure (P057162)

Toyota Tacoma 2015-2018 Service Manual / Cruise Control / Dynamic Radar Cruise Control System(for 2gr-fks) / 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 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: Click here

w/ 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 voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
S10-2 - Body ground	Always	11 to 14 V
S10-4 - Body ground	Ignition switch to ON	11 to 14 V
S10-4 - Body ground	Ignition switch off	Below 1 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	INSPECT STOP LIGHT SWITCH ASSEMBLY

(a) Remove the stop light switch assembly.

Click here (b) Inspect the stop light switch assembly.

(b) Inspect the stop light switch assembly.

Click here

REPLACE STOP LIGHT SWITCH ASSEMBLY

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

(a) Disconnect the E13 ECM connector.

(b) Disconnect the S10 stop light switch assembly connector.

(c) Disconnect the S1 skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2 connector.

*1: for Hydraulic Brake Booster
*2: for Vacuum Brake Booster

(d) Disconnect the S7 shift lock control unit connector.

(e) Remove the STOP relay from the engine room relay block.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
E13-15 (ST1-) - S10-3	Always	Below 1 Ω
E13-16 (STP) - S10-1	Always	Below 1 Ω
E13-15 (ST1-) or S10-3 - Body ground	Always	10 kΩ or higher
E13-16 (STP) or S10-1 - Body ground	Always	10 kΩ or higher

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

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