Lexus NX: Terminals Of Ecu

TERMINALS OF ECU

PARKING ASSIST ECU

(a) Disconnect the P44 parking assist ECU connector.

(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

P44-1 (+B) - P44-4 (GND1)

L - W-B

Power source signal

Power switch off

11 to 14 V

P44-4 (GND1) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

P44-3 (IG) - P44-4 (GND1)

G - W-B

IG power source signal

Power switch on (IG)

11 to 14 V

Power switch off

Below 1 V

P44-2 (ACC) - P44-4 (GND1)

L - W-B

ACC power source signal

Power switch on (ACC)

11 to 14 V

Power switch off

Below 1 V

(c) Reconnect the P44 parking assist ECU connector.

(d) Measure the voltage, resistance and waveform according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

P45-29 (CV+) - P45-31 (SGND)

W - Shielded

Rear television camera assembly display signal input

Power switch on (IG), No. 2 combination switch assembly (panoramic view monitor main switch) on, camera lens not covered, displaying image

Pulse generation (See waveform 1)

Power switch on (IG), No. 2 combination switch assembly (panoramic view monitor main switch) on, camera lens covered, blacking out screen

Pulse generation (See waveform 2)

P45-33 (CB+) - P45-31 (SGND)

B - Shielded

Power source to rear television camera

Power switch on (IG)

5.5 to 7.05 V

P45-6 (RSW+) - P44-4 (GND1)

P - W-B

Terminal required by law

Panoramic image being displayed

0 to 2 V

Panoramic image not being displayed

5.5 to 7.05 V

P44-15 (BLSW) - Body ground

R - Body ground

No. 2 combination switch assembly (panoramic view monitor main switch) switch signal

Power switch on (IG), No. 2 combination switch assembly (panoramic view monitor main switch) off

5.5 to 6.5 V

Power switch on (IG), No. 2 combination switch assembly (panoramic view monitor main switch) on

Below 1 V

P45-31 (SGND) - P44-4 (GND1)

Shielded - W-B

Rear television camera assembly ground (shield)

Always

Below 1 Ω

P45-30 (CV-) - P45-31 (SGND)

R - Shielded

Rear television camera assembly ground

Always

Below 1 Ω

P45-34 (LCV-) - P45-11 (SGND)

W - Shielded

Side television camera assembly LH ground

Always

Below 1 Ω

P45-10 (LCV+) - P45-35 (LGND)

R - G

Side television camera assembly LH display signal input

Power switch on (IG), No. 2 combination switch assembly (panoramic view monitor main switch) on, camera lens not covered, displaying image

Pulse generation (See waveform 1)

Power switch on (IG), No. 2 combination switch assembly (panoramic view monitor main switch) on, camera lens covered, blacking out screen

Pulse generation (See waveform 2)

P45-11 (SGND) - P44-4 (GND1)

Shielded - W-B

Side television camera assembly LH ground (shield)

Always

Below 1 Ω

P45-12 (LCB+) - P45-11 (SGND)

B - Shielded

Power source to side television camera assembly LH

Power switch on (IG)

5.5 to 7.05 V

P45-13 (BCV-) - P45-14 (SGND)

W - Shielded

Front television camera assembly ground

Always

Below 1 Ω

P45-36 (BCV+) - P45-14 (SGND)

R - Shielded

Front television camera assembly display signal input

Waveform 1: Power switch on (IG), No. 2 combination switch assembly (panoramic view monitor main switch) on, camera lens not covered, displaying image

Pulse generation (See waveform 1)

Waveform 2: Power switch on (IG), No. 2 combination switch assembly (panoramic view monitor main switch) on, camera lens covered, blacking out screen

Pulse generation (See waveform 2)

P45-14 (SGND) - P44-4 (GND1)

Shielded - W-B

Front television camera assembly ground (shield)

Always

Below 1 Ω

P45-15 (BCB+) - P45-14 (SGND)

B - Shielded

Power source to front television camera

Power switch on (IG)

5.5 to 7.05 V

P45-16 (RCV-) - P45-39 (SGND)

W - Shielded

Side television camera assembly RH ground

Always

Below 1 Ω

P45-38 (RCV+) - P45-39 (SGND)

R - Shielded

Side television camera assembly RH display signal input

Waveform 1: Power switch on (IG), No. 2 combination switch assembly (panoramic view monitor main switch) on, camera lens not covered, displaying image

Pulse generation (See waveform 1)

Waveform 2: Power switch on (IG), No. 2 combination switch assembly (panoramic view monitor main switch) on, camera lens covered, blacking out screen

Pulse generation (See waveform 2)

P45-39 (SGND) - P44-4 (GND1)

Shielded - W-B

Side television camera assembly RH ground (shield)

Always

Below 1 Ω

P45-40 (RCB+) - P45-39 (SGND)

B - Shielded

Power source to side television camera assembly RH

Power switch on (IG)

5.5 to 7.05 V

(e) Using an oscilloscope, check the waveform.

*a

Waveform 1

*b

Waveform 2

*c

Synchronization Signal

*d

Video Waveform

(1) Waveform 1

Measurement Condition

Item

Content

Terminal No. (Symbol)

  • P45-29 (CV+) - P45-31 (SGND)
  • P45-10 (LCV+) - P45-11 (SGND)
  • P45-36 (BCV+) - P45-14 (SGND)
  • P45-38 (RCV+) - P45-39 (SGND)

Tool Setting

200 mV/DIV., 50 μsec./DIV.

Condition

  • Waveform 1: Power switch on (IG), No. 2 combination switch assembly (panoramic view monitor main switch) on, camera lens not covered, displaying image
  • Waveform 2: Power switch on (IG), No. 2 combination switch assembly (panoramic view monitor main switch) on, camera lens covered, blacking out screen

HINT:

  • The video waveform changes according to the image sent by the television camera assembly.
  • The video waveform is constantly output when the power switch is on (ACC).

RADIO RECEIVER ASSEMBLY (w/ Audio and Visual System)

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RADIO RECEIVER ASSEMBLY (w/ Navigation System)

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