Toyota Tacoma 2015-2018 Service Manual: System Description

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

Operation Check
OPERATION CHECK 1. MALFUNCTION DISPLAY (MULTI-INFORMATION DISPLAY) (a) Open circuit indication (1) If there is an open circuit between a No. 1 ultrasonic sensor and the clearance warning ECU assembly or a sensor is malfunctioning, the malfunction is displayed as shown in the illustration. ...

Dtc Check / Clear
DTC CHECK / CLEAR NOTICE: When the diagnosis system is changed from normal mode to check mode or vice versa, all DTCs and freeze frame data recorded in normal mode are cleared. Before changing modes, always check and make a note of DTCs and freeze frame data. HINT: DTCs which are sto ...

System Diagram
SYSTEM DIAGRAM Communication Table Sender Receiver Signal Communication Method Airbag sensor assembly Main body ECU Front seat inner belt assembly LH buckle switch CAN Combination mete ...