Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. TERMINAL INSPECTION

Text in Illustration

*a

Component without harness connected

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

-

-

(a) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)

Input/Output

Wiring Color

Terminal Description

Condition

Specified Condition

Related Data List Item

S45-1 (GND) - Body ground

-

W-B - Body ground

Ground*

Always

Below 1 Ω

-

S45-3 (IGE) - S45-1 (GND)

Input

Y - W-B

Steering lock motor activation command signal (motor activation command signal sent from certification ECU (smart key ECU assembly))

Any door opened when conditions below met, and then steering lock motor activated:

  • Shift lever in P
  • Steering lock unlocked in advance by carrying key and turning engine switch on (IG)
  • After above conditions met, engine switch turned off

Pulse generation (see waveform)

Smart Key

  • Power Supply Short
  • Unlock Request Receive
  • Lock Request Receive

S45-4 (SLP1) - S45-1 (GND)

Output

BE - W-B

Steering lock bar position signal (output signal from steering unlock sensor)

Steering locked → unlocked

11 to 14 V → Below 1.5 V

Smart Key

  • Sensor Value

S45-5 (LIN) - S45-1 (GND)

Input/Output

L - W-B

LIN communication line

-

-

Smart Key

  • Steering Lock Start Cond

S45-6 (IG2) - S45-1 (GND)

Input

B - W-B

Power source mode signal (IG2 power supply input for entire steering lock actuator assembly)*

Engine switch off → engine switch on (IG)

Below 1 V → 11 to 14 V

-

S45-7 (B) - Body ground

Input

R - Body ground

Power source*

Always

11 to 14 V

-

  • *: When there is a problem with the power source input, the certification ECU (smart key ECU assembly) may store DTC B2786.

NOTICE:

There is 1 motor and 2 sensors built into the steering lock actuator assembly.

HINT:

  • When taking measurements when the lock motor is stopped, it is not necessary to perform any operations.
  • In order to take measurements when the lock motor is operating, perform either of the following operations:
    • To unlock the steering, carry the key and turn the engine switch on (ACC) or on (IG).
    • To lock the steering, turn the engine switch off with the shift lever in P, and then open a door.

(1) Waveform

Item

Content

Tester Connection

S45-3 (IGE) - S45-1 (GND)

Tool Setting

2 V/DIV., 200 ms./DIV.

Vehicle Condition

Steering lock motor not operating → Operating → Not operating

Text in Illustration

*a

Steering Lock Motor not Operating

*b

Steering Lock Motor Operating

Dtc Check / Clear
DTC CHECK / CLEAR NOTICE: The steering lock ECU (steering lock actuator or UPR bracket assembly) does not store history DTCs. If any DTCs are output, confirm and record them as soon ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. READ DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing ...

Other materials:

Inspection
INSPECTION PROCEDURE 1. REMOVE SPIRAL CABLE SUB-ASSEMBLY WITH SENSOR (a) If there are any defects as mentioned below, replace the spiral cable sub-assembly with a new one: Scratches, cracks, dents or chips on the connector or the spiral cable sub-assembly. (b) Inspect the spiral ca ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals ...

Illumination for Panel Switch does not Come on with Tail Switch ON
PROCEDURE 1. CHECK VEHICLE SIGNAL (OPERATION CHECK) (a) Enter the "Vehicle Signal Check Mode" screen. Refer to Check Vehicle Signal in Operation Check (See page ). (b) Check that the display changes between ON and OFF according to the light control ...

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