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:
Driving assist systems
To help enhance driving safety and performance, the following systems operate
automatically in response to various driving situations.
Be aware, however, that these systems are supplementary and should not be relied
upon too heavily when operating the vehicle.
■ ABS (Anti-lock Brake Syst ...
Illumination Circuit
DESCRIPTION
Power is supplied to the radio and display receiver assembly and steering pad
switch assembly illumination when the light control switch is in the TAIL or HEAD
position.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
The vehicle is equipped with a Supplemental Restrain ...
Dtc Check / Clear
DTC CHECK / CLEAR
1. CHECK DTC (CHECK USING TECHSTREAM)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Navigation System / Trouble
Codes.
(e) Check for DTCs, and then write them down.
( ...
