Toyota Tacoma (2015-2018) Service Manual: System Diagram

Toyota Tacoma (2015-2018) Service Manual / 2gr-fks Starting / Smart Key System(for Start Function) / System Diagram

SYSTEM DIAGRAM

Component	Outline
Engine switch Transponder key amplifier	Turns on the power and starts the engine. Contains a built-in transponder key amplifier to start the engine when the key does not operate properly due to a depleted battery or wave interference.
Certification ECU (smart key ECU assembly)	Changes the power source mode by operating the ACC and IG relays. Controls starting by operating the starter relay. Performs key verification. Controls the electrical key antenna (outside), electrical key antenna (indoor) and door lock/unlock sensor. Outputs entry door lock/unlock commands. Outputs steering lock ECU (steering lock actuator or upr bracket assembly) lock/unlock command signals. Outputs immobiliser set/unset commands. Forms the entry function detection area. Records codes for smart verification.
ECM	Outputs a signal indicating that the engine has started to the certification ECU (smart key ECU assembly) when starting the engine.
Steering lock ECU (steering lock actuator or UPR bracket assembly)	Receives command signals from the certification ECU (smart key ECU assembly) and activates the steering lock ECU (steering lock actuator or UPR bracket assembly). Records codes for smart verification.
Combination meter assembly	Operates various warnings (messages on the multi-information display, sounding of the buzzer in the combination meter, blinking or illumination of the smart warning light) according to the command signals from the certification ECU (smart key ECU assembly). Displays information or operates LED when the smart key system has a malfunction. Outputs a vehicle speed signal to the main body ECU (multiplex network body ECU).
IG, ACC relay	Turns on/off according to the certification ECU (smart key ECU) and provides power to each system.
Stop light switch assembly	Detects that the brake pedal has been depressed (switch is on) and outputs a signal to the certification ECU (smart key ECU assembly).
No. 1 indoor electrical key antenna assembly (front floor) No. 2 indoor electrical key antenna assembly (rear floor)	Sends the request code from the certification ECU (smart key ECU assembly) and forms the vehicle interior detection area.
Electrical key and TPMS receiver assembly	Receives the smart key system code/wireless code sent from the key and sends it to the certification ECU (smart key ECU assembly).
Electrical key transmitter sub-assembly	Sends the ID code upon receiving a request signal.

Parts Location

PARTS LOCATION ILLUSTRATION ILLUSTRATION ILLUSTRATION ILLUSTRATION ...

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: Use these procedures to troubleshoot the smart key system (for Start Function). *: Use the Techstream. PROCEDURE 1. VEHIC ...

Other materials:

Unlock Warning Switch
Components COMPONENTS ILLUSTRATION Inspection INSPECTION PROCEDURE 1. INSPECT UNLOCK WARNING SWITCH ASSEMBLY (a) Check the resistance. (1) Measure the resistance according to the value(s) in the table below. Text in Illustration *a Com ...

ECU Power Source Circuit
DESCRIPTION This circuit supplies power to the millimeter wave radar sensor assembly when the ignition switch is ON. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the following inspection procedure. PROCEDURE ...

Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each sy ...