Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: System Description

SYSTEM DESCRIPTION

1. UNLOCK OPERATION CONDITIONS FOR STEERING LOCK

(a) When the following condition is met, the unlock operation is performed.

  • The engine switch is on (ACC) or on (IG).

    HINT:

    When the engine switch is turned on (ACC) or on (IG) and the key and certification ECU (smart key ECU assembly) are verified, the steering is unlocked.

(b) When any of the following conditions are met, key verification is performed.

  • The engine switch is pressed.
  • The brake pedal is depressed so that the engine can be started.
  • 30 seconds have elapsed after opening and closing a door.

HINT:

  • Key verification occurs when the code emitted from the key and the code stored by the certification ECU (smart key ECU assembly) are compared to check that they match.
  • Certification ECU (smart key ECU assembly) verification occurs when the L code is verified while the engine is being started or the engine switch is being pushed. The steering lock ECU (steering lock actuator or UPR bracket assembly) uses the L code to determine whether the certification ECU (smart key ECU assembly) is authorized.

2. LOCK OPERATION CONDITIONS FOR STEERING LOCK

(a) When all of the following conditions are met and the certification ECU (smart key ECU assembly) has been verified, the lock operation is performed.

  • The engine switch is off.
  • The shift lever is in P.
  • A door is opened or a door lock operation (door lock, wireless door lock or key-linked lock operation*) is performed.

    HINT:

    *: This is the lock/unlock operation with the mechanical key.

3. WARNING FUNCTION

(a) A check smart key system message is displayed on the multi-information display in the combination meter assembly when one of the following occurs: 1) A vehicle speed signal malfunction is detected, 2) a malfunction that interferes with steering lock ECU (steering lock actuator or UPR bracket assembly) operation is detected.

If a malfunction occurs which results in the message being displayed, the engine cannot be started once it is turned off.

HINT:

DTCs are stored in all cases listed above.

4. STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPR BRACKET ASSEMBLY) DESCRIPTION

(a) The steering lock ECU and steering lock motor are built into the steering lock actuator assembly of the steering column assembly.

(b) The steering lock ECU (steering lock actuator or UPR bracket assembly) is not connected to the CAN communication system. However, the steering lock ECU (steering lock actuator or UPR bracket assembly) is connected to the certification ECU (smart key ECU assembly) via LIN communication and communicates with other components via CAN communication through the certification ECU (smart key ECU assembly).

Parts Location
PARTS LOCATION ILLUSTRATION ILLUSTRATION ...

System Diagram
SYSTEM DIAGRAM Circuit Description Component Outline Steering Lock ECU (Steering Lock Actuator or UPR Bracket Assembly) The steering is ...

Other materials:

Pattern Select Switch Power Mode Circuit
DESCRIPTION The ECM memory contains the programs for the normal and PWR shift patterns. By following the programs corresponding to the signals from the pattern select switch assembly, park/neutral position switch and other various sensors, the ECM switches the shift solenoid valves on and off, ...

Unable to Lock Steering Wheel
DESCRIPTION The steering lock actuator assembly activates the steering lock motor and moves the lock bar into the steering column to lock the steering. When the steering lock is operating, the steering may not lock when the lock bar is not aligned with the lock hole of the steering column. In ...

Key information
The following keys are provided with the vehicle. Vehicles without engine immobilizer system Master keys Key number plate Vehicles with engine immobilizer system Master keys Key number plate ■Key number plate Keep the plate in a safe place such as your wallet, not in the v ...

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