Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: System Description

SYSTEM DESCRIPTION

1. SYSTEM FUNCTION

Function

Outline

Push-button start function

When the key is brought into the vehicle and verified, this function changes the power source or starts the engine when the engine switch and brake pedal are operated.

Battery saving function for vehicle

When the vehicle is not used for a long time, this function extends the interval between each periodic transmission of the request signal, or stops transmission of the request signal to save vehicle battery power.

  • When 5 days elapse without a response from the key, periodic transmission stops.
  • When 14 days elapse without a response from the key, the lock/ unlock sensor of all door outside handle assemblies except the driver door is disabled.

When the electrical key transmitter sub-assembly is left in a detection area for 10 minutes or more, the smart key system automatically deactivates the exterior detection area the key is in.

Battery saving function for key

If a switch on the key is depressed and held, this function stops transmission of the signal after approximately 20 seconds to save key battery power.

Key cancel function

Cancels the smart key system when certain operations are performed.

Immobiliser function

Allows the engine to be started only using registered keys to prevent an unauthorized engine start.

Automatic power off function

  • With the shift lever in P and the engine switch on (ACC) (the engine is not started and the vehicle is not moving), the power automatically turns off when the vehicle is left as is for 20 minutes or more.
  • With the shift lever in P and the engine switch on (IG) (the engine is not started and the vehicle is not moving), the power automatically turns off when the vehicle is left as is for 60 minutes or more.

2. DETECTION AREA

NOTICE:

  • Depending on the vehicle body shape, the key may not operate in certain locations.
  • Even if the key is in the vehicle exterior key detection area, the key may not be properly detected if the key is near a window or a door handle.
  • Even if the key is in the vehicle interior key detection area, the key may not be properly detected if the key is on the instrument panel, in the glove box or on the floor.
  • Depending on the way the key is held, the key may not operate properly.
  • The key detection area may reduce in size or the key may not be properly detected under the conditions below:
    • The key battery is depleted.
    • There are TV towers, electric power plants, broadcasting stations, gas stations or other facilities that produce strong electric waves nearby.
    • Wireless products such as cell phones, etc. are carried with the key.
    • The key is covered by or in contact with a metal object.
    • Electric wave-type keyless entry systems are being operated nearby.
    • The key is placed near high-voltage equipment or equipment that emits electrical noise.

(a) The request signal sent from the certification ECU (smart key ECU assembly) is transmitted from each electrical key antenna (outside) to form the smart key detection area. The detection area formed by each electrical key antenna (outside) has a detection range of 0.7 to 1 m (2.30 to 3.28 ft.) from the door handle.

(b) When the vehicle is parked (the power source mode is off and the doors are locked*), the detection area of each electrical key antenna (outside) is formed by emitting a periodic request signal every 0.25 seconds in order to detect the key. Also, when the doors are locked and a lock sensor is touched, a request signal is emitted, the detection area outside the vehicle is formed and the key is detected.

HINT:

*: The smart key system controls each door individually. After a door is locked with the door lock switch or wireless remote control function, a detection area is formed at the locked door even if all the doors are not locked.

(c) The detection area inside the vehicle is formed and the key is detected when any of the following conditions are met: 1) The driver door is opened and closed, 2) the brake pedal is depressed, 3) the engine switch is operated, 4) the conditions required for various warnings are met, or 5) a entry door lock operation is performed.

(d) The detection area inside the vehicle when starting the engine can be customized through the customize function.

Operation Check
OPERATION CHECK 1. OPERATION DESCRIPTION (a) Push-button start function: (1) When the electrical key transmitter sub-assembly is in a detection area inside the vehicle and the brake pedal is depr ...

Customize Parameters
CUSTOMIZE PARAMETERS PROCEDURE 1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) HINT: The following items can be customized. NOTICE: When the customer requests a change in a function, ...

Other materials:

Cruise Main Indicator Light Circuit
DESCRIPTION When the dynamic radar cruise control system is turned on using the cruise control main switch (ON-OFF button), the cruise control indicator (vehicle-to-vehicle distance control mode) illuminates. The ECM uses this and other indicators to indicate the control condition (presence o ...

Freeze Frame Data
FREEZE FRAME DATA CHECK FREEZE FRAME DATA HINT: The ECU records vehicle and driving condition information as freeze frame data the moment a DTC is stored. (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the Techstream on. (d) Enter the following menus: P ...

Lost Communication with Alternator Missing Message (P161A87)
DESCRIPTION The ECM communicates with the generator assembly via LIN communication. If a LIN communication error is detected, the ECM stores this DTC. DTC No. DTC Detection Condition Trouble Area P161A87 Generator assembly or ECM commu ...

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