Lexus NX manuals

Lexus NX: Terminals Of Ecu

Lexus NX Service Manual / Vehicle Interior / Door Lock / Wireless Door Lock Control System / Terminals Of Ecu

TERMINALS OF ECU

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

*1

Main Body ECU (Multiplex Network Body ECU)

-

-

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

(b) Reconnect the instrument panel junction block assembly connector.

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

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

A-11 (GND1) - Body ground

-

Ground

Always

Below 1 Ω

A-30 (ACC) - Body ground

-

ACC power supply

Power switch on (ACC)

11 to 14 V

Power switch off

Below 1 V

A-31 (BECU) - Body ground

-

Auxiliary battery power supply

Power switch off

11 to 14 V

A-32 (IG) - Body ground

-

IG power supply

Power switch on (IG)

11 to 14 V

Power switch off

Below 1 V

(d) Install the main body ECU (multiplex network body ECU) to the instrument panel junction block assembly.

Click here

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

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

I47-2 (LSWR) - Body ground

Y - Body ground

Rear door RH unlock detection switch input

Rear door RH unlocked

Below 1 V

Rear door RH locked

Pulse generation

I48-2 (UL3) - Body ground

LG - Body ground

Driver door key-linked unlock input

Driver door key cylinder turned to neutral position → on (unlock)

Pulse generation → Below 1 V

I48-6 (FLCY) - Body ground

G - Body ground

Front door courtesy light switch LH input

Front door LH open

Below 1 V

Front door LH closed

Pulse generation

I48-27 (FRCY) - Body ground

W - Body ground

Front door courtesy light switch RH input

Front door RH open

Below 1 V

Front door RH closed

Pulse generation

I48-29 (L2) - Body ground

R - Body ground

Driver door key-linked lock input

Driver door key cylinder turned to neutral position → on (lock)

Pulse generation → Below 1 V

4A-1 (ACT-) - Body ground

R - Body ground

Door lock motor unlock drive output

Door control switch or driver door key cylinder off → on (unlock)

Below 1 V → 11 to 14 V → Below 1 V

4A-4 (ACT+) - Body ground

R - Body ground

Door lock motor lock drive output

Door control switch or driver door key cylinder off → on (lock)

Below 1 V → 11 to 14 V → Below 1 V

4A-18 (LCTY) - Body ground

W - Body ground

Rear door courtesy light switch LH input

Rear door LH open

Below 1 V

Rear door LH closed

Pulse generation

4A-21 (BCTY) - Body ground

LG - Body ground*1

R - Body ground*2

Back door courtesy light switch input

Back door open

Below 1 V

Back door closed

Pulse generation

4A-25 (TR+) - Body ground*3

W - Body ground

Back door lock motor drive output

Back door closed → open

Below 1 V → 11 to 14 V → Below 1 V

4A-34 (LSWL) - Body ground

Y - Body ground

Rear door LH unlock detection switch input

Rear door LH unlocked

Below 1 V

Rear door LH locked

Pulse generation

4B-52 (BZR) - Body ground

P - Body ground

Wireless door lock buzzer output

Power switch off, all doors closed, electrical key transmitter sub-assembly no inside vehicle and lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed (wireless door lock buzzer answer-back)

Below 1 V → Pulse generation

4D-4 (ACT-) - Body ground

LG - Body ground

Door lock motor unlock drive output

Door control switch or driver door key cylinder off → on (unlock)

Below 1 V → 11 to 14 V → Below 1 V

4C-10 - Body ground

R - Body ground

Door lock power supply

Door control switch or driver door key cylinder off → on (lock or unlock)

11 to 14 V → Below 1 V → 11 to 14 V

4D-5 (ACT-) - Body ground

B - Body ground

Door lock motor unlock drive output

Door control switch or driver door key cylinder off → on (unlock)

Below 1 V → 11 to 14 V → Below 1 V

4D-10 (ACTD) - Body ground

B - Body ground

Door lock motor unlock drive output

Door control switch or driver door key cylinder off → on (unlock)

Below 1 V → 11 to 14 V → Below 1 V

4D-11 (ACT+) - Body ground

R - Body ground

Door lock motor lock drive output

Door control switch or driver door key cylinder off → on (lock)

Below 1 V → 11 to 14 V → Below 1 V

4D-12 (ACT+) - Body ground

R - Body ground

Door lock motor lock drive output

Door control switch or driver door key cylinder off → on (lock)

Below 1 V → 11 to 14 V → Below 1 V

4D-13 (ACT+) - Body ground

P - Body ground

Door lock motor lock drive output

Door control switch or driver door key cylinder off → on (lock)

Below 1 V → 11 to 14 V → Below 1 V

4D-37 (RCTY) - Body ground

Y - Body ground

Rear door courtesy light switch RH input

Rear door RH open

Below 1 V

Rear door RH closed

Pulse generation

4D-39 (LSFR) - Body ground

P - Body ground

Front door RH unlock detection switch input

Front door RH unlocked

Below 1 V

Front door RH locked

Pulse generation

4D-40 (LSFL) - Body ground

B - Body ground

Front door LH unlock detection switch input

Front door LH unlocked

Below 1 V

Front door LH locked

Pulse generation
  • *1: w/ Rear Power Seat System
  • *2: w/o Rear Power Seat System
  • *3: w/o Power Back Door System

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Disconnect the I53 certification ECU (smart key ECU assembly) connector.

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

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

I53-10 (+B) - Body ground

W - Body ground

Auxiliary battery power supply

Power switch off

11 to 14 V

I53-11 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the I53 certification ECU (smart key ECU assembly) connector.

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

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

I52-18 (RCO) - I53-11 (E)

R - W-B

Output to door control receiver

(Power supply for door control receiver. Certification ECU [smart key ECU assembly] outputs 5 V when receiver starts operating.)
Proceed:
  1. Power switch off
  2. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
  3. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

Pulse generation

(See waveform 1)

I52-19 (CSEL) - I53-11 (E)

B - W-B

Communication channel switching circuit
Proceed:
  1. Power switch off
  2. All doors closed

Below 1 V → Pulse generation

I52-20 (RDAM) - I53-11 (E)

L - W-B

Door control receiver verifies data received from electrical key transmitter sub-assembly.

Door control receiver sends data from electrical key transmitter sub-assembly to certification ECU (smart key ECU assembly) (Door control receiver intermittently grounds 12 V signal from certification ECU [smart key ECU assembly]).
Proceed:
  1. Power switch off
  2. All doors locked
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
  5. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

Pulse generation

(See waveform 2)

(e) Using an oscilloscope, check waveform 1.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

*a

Before lock or unlock switch of electrical key transmitter sub-assembly pressed

*b

After lock or unlock switch of electrical key transmitter sub-assembly pressed
Waveform 1 (Reference)

Item

Content

Tester Connection

I52-18 (RCO) - I53-11 (E)

Tool Setting

2 V/DIV., 500 ms/DIV.

Condition
Procedure:
  1. Power switch off
  2. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
  3. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

(f) Using an oscilloscope, check waveform 2.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

*a

Before lock or unlock switch of electrical key transmitter sub-assembly pressed

*b

After lock or unlock switch of electrical key transmitter sub-assembly pressed
Waveform 2 (Reference)

Item

Content

Tester Connection

I52-20 (RDAM) - I53-11 (E)

Tool Setting

5 V/DIV., 500 ms/DIV.

Condition
Procedure:
  1. Power switch off
  2. All doors locked
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
  5. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

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