Lexus ES manuals

Lexus ES: Terminals Of Ecu

TERMINALS OF ECU

REAR TELEVISION CAMERA ASSEMBLY

(a) Disconnect the T1 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

T1-6 (CB+) - Body ground

GR - Body ground

Power source

Engine switch on (ACC)

5.5 to 7.05 V

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

(c) Reconnect the T1 rear television camera assembly connector.

(d) Check for pulses between each terminal of the connector.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

T1-3 (CV+) - T1-2 (CV-)

B - G

Video signal

Engine switch on (IG)

Shift lever in R

Camera lens not covered, displaying image

Pulse generation

(Refer to waveform 1)

Engine switch on (IG)

Shift lever in R

Camera lens covered, blacking out screen

Pulse generation

(Refer to waveform 2)

T1-5 (CGND) - Body ground

BR - Body ground

Camera ground

Always

Below 1 V

HINT:

A waterproof connector is used for the rear television camera assembly. Therefore, inspect the waveform at the multi-display assembly with the connector connected.

If the result is not as specified, the rear television camera assembly may be malfunctioning.

(e) Reference (Oscilloscope waveform):

*a

Waveform 1 (camera lens is not covered, displaying an image)

*b

Waveform 2 (camera lens is covered, blacking out the screen)

*c

Synchronization Signal

*d

Video Waveform

HINT:

A waterproof connector is used for the rear television camera assembly. Therefore, inspect the waveform at the multi-display assembly with the connector connected.

(1) Waveform 1 (camera lens is not covered, displaying an image)

Item

Content

Measurement terminal

T1-3 (CV+) - T1-2 (CV-)

Measurement setting

200 mV/DIV., 50 μs./DIV.

Condition

Engine switch on (IG), shift lever in R

HINT:

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

(2) Waveform 2 (camera lens is covered, blacking out the screen)

Item

Content

Measurement terminal

T1-3 (CV+) - T1-2 (CV-)

Measurement setting

200 mV/DIV., 50 μs./DIV.

Condition

Engine switch on (IG), shift lever in R

HINT:

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

MULTI-DISPLAY ASSEMBLY

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

G22-3 (REV) - G22-13 (GND1)

P - LA

Reverse signal

Engine running, shift lever not in R → in R

3.5 V or higher → Below 1 V

G22-8 (V+) - G22-13 (GND1)

B - LA

Video signal

Engine switch on (IG)

Shift lever in R

Camera lens not covered, displaying image

Pulse generation

(Refer to waveform 1)

Engine switch on (IG)

Shift lever in R

Camera lens covered, blacking out screen

Pulse generation

(Refer to waveform 2)

G22-9 (V-) - G22-13 (GND1)

W - LA

Ground

Always

Below 1 V

G22-10 (CA+) - G22-21 (CGND)

R - G

Television camera assembly power supply

Engine switch on (ACC)

5.5 to 7.05 V

G22-14 (CSWA) - G22-13(GND1)*

P - LA

Camera image change signal

Engine running

Parking support alert (static objects) image not being displayed → Parking support alert (static objects) image being displayed

3.5 V or higher → Below 1 V

G22-20 (CSLD) - Body ground

Shielded - Body ground

Shield ground

Always

Below 1 Ω

G22-21 (CGND) - Body ground

G - Body ground

Camera ground

Always

Below 1 Ω

G113-3 (GND)

Shielded

Shield ground

-

-

  • *: w/ Parking Support Alert System

(a) Reference (Oscilloscope waveform):

(1) Waveform 1 (camera lens not covered, displaying an image)

Item

Content

Measurement terminal

G22-8 (V+) - G22-13 (GND1)

Measurement setting

200 mV/DIV., 50 μs/DIV.

Condition

Engine switch on (IG), shift lever in R

HINT:

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

*a

Waveform 1 (camera lens is not covered, displaying an image)

*b

Waveform 2 (camera lens is covered, blacking out the screen)

*c

Synchronization Signal

*d

Video Waveform

(2) Waveform 2 (camera lens covered, blacking out the screen)

Item

Content

Measurement terminal

G22-8 (V+) - G22-13 (GND1)

Measurement setting

200 mV/DIV., 50 μs/DIV.

Condition

Engine switch on (IG), shift lever in R

HINT:

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

CLEARANCE WARNING ECU (w/ Parking Support Alert System)

Click here

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