Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Terminals Of Ecu

*a

Component without harness connected

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

-

-

L1-1 (GND) - Body ground

-

W-B - Body ground

Ground*

Always

Below 1 Ω

-

L1-3 (IGE) - L1-1 (GND)

Input

SB - 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:

Pulse generation (see waveform)

L1-4 (SLP1) - L1-1 (GND)

Output

GR - W-B

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

Steering locked → unlocked

11 to 14 V → Below 1.5 V

L1-5 (LIN) - L1-1 (GND)

Input/Output

R - W-B

LIN communication line

-

-

L1-6 (IG2) - L1-1 (GND)

Input

P - W-B

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

Engine switch off → engine switch on (IG)

Below 1 V → 11 to 14 V

-

L1-7 (B) - Body ground

Input

V - Body ground

Power source*

Always

11 to 14 V

-

*a

Steering Lock Motor not Operating

*b

Steering Lock Motor Operating

Tester Connection

L1-3 (IGE) - L1-1 (GND)

Tool Setting

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

Vehicle Condition

Steering lock motor not operating → Operating → Not operating