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:

ABS Warning Light Remains ON
DESCRIPTION If any of the following is detected, the ABS warning light remains on. The skid control ECU (master cylinder solenoid) connectors are disconnected from the skid control ECU (master cylinder solenoid). There is a malfunction in the skid control ECU (master cylinder soleno ...

Lost Communication with ECM / PCM "A" (U0100,U0104,U0122,U0125,U0126,U0129)
DESCRIPTION The millimeter wave radar sensor assembly and ECM communicate with each sensor and ECU via CAN communication. If any malfunction is detected in a CAN communication circuit, one or more CAN communication system DTCs are stored. DTC No. Detection Item ...

Short in Front Passenger Side Squib 2nd Step Circuit (B1815/54-B1818/54)
DESCRIPTION The front passenger side squib 2nd step circuit consists of the airbag sensor assembly and the instrument panel passenger without door airbag assembly. The circuit signals the SRS to deploy when airbag deployment conditions are met. These DTCs are set when a malfunction is detected ...

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