Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: 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:

Steering Pad Switch Circuit
DESCRIPTION This circuit sends an operation signal from the steering pad switch assembly to the navigation receiver assembly. If there is an open in the circuit, the audio system cannot be operated using the steering pad switch assembly. If there is a short in the circuit, the same condition ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. READ DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or sig ...

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 ...

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