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

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Exterior / Lighting (ext) / Lighting System (w/o Automatic Headlight Beam Level Control System) / Terminals Of Ecu

TERMINALS OF ECU

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

2B-3 - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

2C-1 - Body ground

GR - Body ground

Battery power supply

Always

11 to 14 V

2E-1 - Body ground

B - Body ground

Battery power supply

Always

11 to 14 V

(c) Connect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

(d) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

2C-19 - Body ground

LA-R - Body ground

BKUP LP relay drive output

Engine switch off, reverse (R) not selected

Below 1 V

Engine switch on (IG), reverse (R) selected

11 to 14 V

2C-31 - Body ground

B - Body ground

H-LP LH relay drive output

Engine switch on (IG) or taillights on

Below 1 V

Engine switch off and taillights off

11 to 14 V

2C-32 - Body ground

SB - Body ground

Parking lights and front side marker lights drive output

Taillights on

11 to 14 V

Taillights off

Below 1 V

2D-10 - Body ground

R - Body ground

Back-up lights drive output

Engine switch off, reverse (R) not selected

Below 1 V

Engine switch on (IG), reverse (R) selected

11 to 14 V

2D-30 - Body ground

B - Body ground

Taillights, rear side marker lights and license plate lights drive output

Taillights on

11 to 14 V

Taillights off

Below 1 V

J8-1 (DIM) - Body ground

L - Body ground

H-LP RH relay drive output

Engine switch on (IG) or taillights on

Below 1 V

Engine switch off and taillights off

11 to 14 V

J8-3 (RLEW) - Body ground

GR - Body ground

Light control ECU signal input

Engine switch on (IG), taillight off

11 to 14 V

Engine switch on (IG), light control switch in head position

Pulse generation

J8-8 (A) - Body ground

G - Body ground

Light control switch AUTO position signal input

Light control switch in AUTO position

Below 1 V

Light control switch not in AUTO position

Pulse generation

J8-10 (HF) - Body ground

W - Body ground

Dimmer switch high flash position signal input

Dimmer switch in high flash position

Below 1 V

Dimmer switch not in high flash position

Pulse generation

J8-12 (HEAD) - Body ground

Y - Body ground

Light control switch head position input

Light control switch in head position

Below 1 V

Light control switch not in head position

Pulse generation

J8-16 (LLEW) - Body ground

LG - Body ground

Light control ECU signal input

Engine switch on (IG), taillight off

11 to 14 V

Engine switch on (IG), light control switch in head position

Pulse generation

J8-19 (CLTB) - J8-21 (CLTE)

V - Y

Automatic light control sensor power supply output

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

J8-20 (CLTS) - Body ground

BE - Body ground

Automatic light control sensor signal input

Engine switch off

Below 1 V

Engine switch on (IG)

(See waveform 1)

Pulse generation

J8-22 (TAIL) - Body ground

V - Body ground

Light control switch tail position signal input

Taillights on

Below 1 V

Taillights off

Pulse generation

J8-24 (HU) - Body ground

GR - Body ground

Dimmer switch high position signal input

Dimmer switch in high position

Below 1 V

Dimmer switch not in high position

Pulse generation

J9-4 (MILE) - Body ground

SB - Body ground

Outside handle foot lights drive output

Outside handle foot light illuminates

11 to 14 V

Outside handle foot light off

Below 3 V

J9-23 (AHBI) - Body ground*

G - Body ground

Automatic high beam switch signal input

Automatic high beam switch on

Below 1 V

Automatic high beam switch off

Pulse generation
  • *: w/ Automatic High Beam System

(1) Waveform 1

Item

Content

Tester Connection

J8-20 (CLTS) - Body ground

Tool setting

2 V/DIV., 10 ms./DIV.

Condition

Engine switch on (IG)

HINT:

The communication waveform changes according to the surrounding brightness.

CHECK COMBINATION METER ASSEMBLY

Click here

CHECK FORWARD RECOGNITION CAMERA (w/ Automatic High Beam System)

Click here

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