Toyota Tacoma (2015-2018) Service Manual: System Diagram

Toyota Tacoma (2015-2018) Service Manual / Steering Column / Steering Lock System / System Diagram

SYSTEM DIAGRAM

Circuit Description

Component	Outline
Steering Lock ECU (Steering Lock Actuator or UPR Bracket Assembly)	The steering is locked and unlocked by communicating with the certification ECU (smart key ECU assembly) via LIN communication. When the following conditions are met, the steering can be unlocked. The codes (L codes) of the certification ECU (smart key ECU assembly) and steering lock match. The certification ECU (smart key ECU assembly) and key ID codes match.
Certification ECU (Smart Key ECU Assembly)	The ID code of the key the user is carrying is sent to the electrical key antenna. The certification ECU (smart key ECU assembly) compares the key ID code it receives from the electrical key antenna with its own ID code. If they match, the certification ECU (smart key ECU assembly) permits the steering lock ECU (steering lock actuator or UPR bracket assembly) to turn the power on, start the engine and unlock and lock the steering. Outputs a command to supply power to the steering lock motor based on the power source mode, shift position and vehicle speed signal.

Component

Outline

Steering Lock ECU (Steering Lock Actuator or UPR Bracket Assembly)

The steering is locked and unlocked by communicating with the certification ECU (smart key ECU assembly) via LIN communication.
When the following conditions are met, the steering can be unlocked.
- The codes (L codes) of the certification ECU (smart key ECU assembly) and steering lock match.
- The certification ECU (smart key ECU assembly) and key ID codes match.

Certification ECU (Smart Key ECU Assembly)

The ID code of the key the user is carrying is sent to the electrical key antenna.
The certification ECU (smart key ECU assembly) compares the key ID code it receives from the electrical key antenna with its own ID code. If they match, the certification ECU (smart key ECU assembly) permits the steering lock ECU (steering lock actuator or UPR bracket assembly) to turn the power on, start the engine and unlock and lock the steering.
Outputs a command to supply power to the steering lock motor based on the power source mode, shift position and vehicle speed signal.

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). H ...

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: Use the following procedures to troubleshoot the steering lock system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT ...

Other materials:

Cleaning and protecting the vehicle exterior
Perform the following to protect the vehicle and maintain it in prime condition. ● Working from top to bottom, liberally apply water to the vehicle body, wheel wells and underside of the vehicle to remove any dirt and dust. Wash the vehicle body using a sponge or soft cloth, such as a cham ...

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 ...

Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION (a) The steering lock ECU (steering lock actuator or UPR bracket assembly) stores DTCs when a malfunction occurs in the system. These DTCs can be confirmed by using the Techstream. NOTICE: When using the Techstream with the engine switch off to confirm ...