Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Terminals Of Ecu

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Vehicle Interior / Lighting (int) / Lighting System / Terminals Of Ecu

TERMINALS OF ECU

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

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

(b) Measure the voltage on the wire harness side connector according to the value(s) in the table below.

Terminal No.

Wiring Color

Terminal Description

Condition

Specified Condition

2C-1 - Body ground

W - 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

If the result is not as specified, there may be a malfunction in the wire harness.

(c) Measure the resistance on the wire harness side connector 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

If the result is not as specified, there may be a malfunction in the wire harness.

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

(e) 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

2A-30 - Body ground

GR - Body ground

ACC power supply

Engine switch on (ACC)

11 to 14 V

Engine switch off

Below 1 V

2A-17 - Body ground

G - Body ground

IG power supply

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1 V

2B-27 - Body ground

LA-G - Body ground

Footwell light, instrument panel box light and instrument panel ambient illumination light power supply

Always

11 to 14 V

2B-25 - Body ground*2

Y - Body ground

Door ambient illumination light LH power supply

Always

11 to 14 V

2B-24 - Body ground*2

L - Body ground

Door ambient illumination light RH power supply

Always

11 to 14 V

2D-19 - Body ground

B - Body ground

No. 1 luggage compartment light power supply

DOME CUT relay on

11 to 14 V

DOME CUT relay off

Below 1 V

2B-9 - Body ground

L - Body ground
  • Courtesy light LH power supply
  • Scuff light power supply*3

DOME CUT relay on

11 to 14 V

DOME CUT relay off

Below 1 V

2B-10 - Body ground

W - Body ground

Map light assembly, courtesy light RH and vanity lights power supply

DOME CUT relay on

11 to 14 V

DOME CUT relay off

Below 1 V

2B-29 - Body ground

GR - Body ground

Interior lights drive output

Interior lights off (when operated by illuminated entry system)

11 to 14 V

Interior lights on (when operated by illuminated entry system)

Below 1 V

2A-37 - Body ground

W - Body ground

Footwell light and instrument panel box light output

Footwell light and instrument panel box light off

11 to 14 V

Footwell light and instrument panel box light dimmer control operating (dimming)

Pulse generation

Footwell light and instrument panel box light at full brightness

Below 2.2 V

J9-27 (DMDR) - Body ground

BE - Body ground

Door switch signal input

Door switch on

Below 1 V

Door switch off

Pulse generation

J9-28 (DMON) - Body ground

LG - Body ground

Front dome light switch signal input

Front dome light switch on

Below 1 V

Front dome light switch off

Pulse generation

2D-24 - Body ground

W - Body ground

Rear door courtesy light switch LH input

Rear door LH open

Below 1 V

Rear door LH closed

11 to 14 V

2A-31 - Body ground

R - Body ground

Rear door courtesy light switch RH input

Rear door RH open

Below 1 V

Rear door RH closed

11 to 14 V

J8-6 (FLCY) - Body ground

P - Body ground

Front door courtesy light switch LH input

Front door LH open

Below 1 V

Front door LH closed

11 to 14 V

J8-27 (FRCY) - Body ground

R - Body ground

Front door courtesy light switch RH input

Front door RH open

Below 1 V

Front door RH closed

11 to 14 V

J9-2 (LSWR) - Body ground

L - Body ground

Rear door unlock detection switch RH input

Rear door RH locked

Pulse generation

Rear door RH unlocked

Below 1 V

2B-14 - Body ground

V - Body ground

Rear door unlock detection switch LH input

Rear door LH locked

Pulse generation

Rear door LH unlocked

Below 1 V

2B-13 - Body ground

B - Body ground

Front door unlock detection switch LH input

Front door LH locked

Pulse generation

Front door LH unlocked

Below 1 V

2B-12 - Body ground

P - Body ground

Front door unlock detection switch RH input

Front door RH locked

Pulse generation

Front door RH unlocked

Below 1 V

J7-1 (RCYL) - Body ground

G - Body ground

Rear door courtesy light RH drive output

Rear door courtesy light RH off

11 to 14 V

Rear door courtesy light RH on

Below 1 V

J7-2 (LCYL) - Body ground

Y - Body ground

Rear door courtesy light LH drive output

Rear door courtesy light LH off

11 to 14 V

Rear door courtesy light LH on

Below 1 V

J9-17 (FRCL) - Body ground

SB - Body ground

Front door courtesy light RH drive output

Front door courtesy light RH off

11 to 14 V

Front door courtesy light RH on

Below 1 V

J9-1 (FLCL) - Body ground

W - Body ground

Front door courtesy light LH drive output

Front door courtesy light LH off

11 to 14 V

Front door courtesy light LH on

Below 1 V

J9-21 (LED1) - Body ground*1

L - Body ground

Instrument panel ambient illumination light output

Instrument panel ambient illumination light off

11 to 14 V

Instrument panel ambient illumination light dimmer control operating (dimming)

Pulse generation

Instrument panel ambient illumination light at full brightness

Below 2.2 V

J9-22 (LED2) - Body ground*2

V - Body ground

Door ambient illumination light output

Door ambient illumination light off

11 to 14 V

Door ambient illumination light dimmer control operating (dimming)

Pulse generation

Door ambient illumination light at full brightness

Below 2.2 V

If the result is not as specified, the main body ECU (multiplex network body ECU) or instrument panel junction block assembly may be malfunctioning.

*1: w/ Instrument panel ambient illumination light

*2: w/ Door ambient illumination light

*3: w/ Scuff Light

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J41-10 (SWIL) - J41-11 (AGND)

W - R

Engine switch illumination drive output

Engine switch illumination on

11 to 14 V

Engine switch illumination off

Below 1 V
  • If the result is not as specified, the certification ECU (smart key ECU assembly) may be malfunctioning.

CHECK MULTIPLEX NETWORK DOOR ECU

(a) Disconnect the Z16 and Z17 multiplex network door ECU connectors.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

Z16-20 (ECUB) - Body ground

GR - Body ground

Battery power supply

Always

11 to 14 V

Z16-18 (IG) - Body ground

P - Body ground

IG power supply

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1 V

Z17-1 (B) - Body ground

Y - Body ground

Battery power supply

Always

11 to 14 V
  • If the result is not as specified, the multiplex network door ECU may be malfunctioning.

(c) Reconnect the Z16 and Z17 multiplex network door 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

Z17-5 (CTYO) - Body ground

W - Body ground

Luggage compartment light drive output

Back door closed (when No. 1 luggage compartment light switch on)

11 to 14 V

Back door open (when No. 1 luggage compartment light switch on)

Below 1 V

Z16-11 (FUL) - Body ground

V - Body ground

Back door lock assembly (latch courtesy switch) signal circuit

Back door closed → open

Pulse generation → Below 1 V
    Problem Symptoms Table
    PROBLEM SYMPTOMS TABLE NOTICE: Before replacing the main ECU (multiplex network body ECU), refer to Service Bulletin. HINT: Use the table below to help determine the cause of problem symptoms. If mult ...

    Diagnosis System
    DIAGNOSIS SYSTEM DESCRIPTION (a) Lighting system data can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malf ...

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