Lexus NX: Terminals Of Ecu

TERMINALS OF ECU

REAR TELEVISION CAMERA ASSEMBLY

(a) Disconnect the Y25 rear television camera assembly connector.

(b) Measure the voltage 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

Y25-6 (CB+) - Body ground

B - Body ground

Power source

Power switch on (ACC)

5.5 to 7.05 V

(c) Reconnect the Y25 rear television camera assembly connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

Y25-2 (CV-) - Body ground

R - Shielded

Ground

Always

Below 1 Ω

Y25-3 (CV+) - Y25-2 (CV-)

W - R

Video signal

Power switch on (IG), shift lever in R, camera lens is not covered, displaying an image

Pulse generation (See waveform 1)

Power switch on (IG), shift lever in R, camera lens is covered, blacking out screen

Pulse generation (See waveform 2)

Y25-5 (CGND) - Body ground

G - Body ground

Shielded ground

Always

Below 1 Ω

(e) Reference (Oscilloscope waveform):

HINT:

A waterproof connector is used for the rear television camera assembly. Therefore, inspect the waveform at the radio receiver assembly with the connector connected.

*a

Waveform 1

*b

Waveform 2

*c

Synchronization Signal

*d

Video Waveform

(1) Waveform 1

Item

Content

Terminal No. (Symbol)

Y25-3 (CV+) - Y25-2 (CV-)

Tool Setting

200 mV/DIV., 50 μsec./DIV.

Condition

Power switch on (IG), shift lever in R, camera lens is not covered, displaying an image

HINT:

The video waveform changes according to the image sent by the rear television camera assembly.

(2) Waveform 2

Item

Content

Terminal No. (Symbol)

Y25-3 (CV+) - Y25-2 (CV-)

Tool Setting

200 mV/DIV., 50 μsec./DIV.

Condition

Power switch on (IG), shift lever in R, camera lens is covered, blacking out screen

HINT:

The video waveform changes according to the image sent by the rear television camera assembly.

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