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:

Fail-safe Chart
FAIL-SAFE CHART 1. PULSE FAILURE OR DISPLACEMENT OF NON-DETECTION RANGE TO THE OPENING DIRECTION (a) If the pulse sensor built into the power window regulator motor malfunctions, the power window control system enters fail-safe mode. Power Window Regulator Master Switch Assembly, Front Power Wi ...

Disassembly
DISASSEMBLY PROCEDURE 1. INSPECT 3RD GEAR THRUST CLEARANCE (a) Using a dial indicator, measure the 3rd gear thrust clearance. Standard clearance: 0.200 to 0.490 mm (0.0079 to 0.0192 in.) If the clearance is outside the specification, replace the 3rd gear, thrust washer, c ...

Terminals Of Ecu
TERMINALS OF ECU CHECK ECM HINT: The standard voltage, resistance and waveform between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals is also indicated. The result of checks should be compared with the standar ...