Toyota Avalon Service & Repair Manual: Terminals Of Ecu

TERMINALS OF ECU

TELEVISION CAMERA ASSEMBLY

(a) Disconnect the P19 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

P19-6 (CB+) - Body ground

R - 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 P19 television camera assembly connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

P19-3 (CV+) - P19-2 (CV-)

B - W

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)

P19-5 (CGND) - Body ground

G - Body ground

Camera ground

Always

Below 1 V

HINT:

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

If the result is not as specified, the 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 television camera assembly. Therefore, inspect the waveform at the radio and display receiver assembly with the connector connected.

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

Item

Content

Measurement terminal

P19-3 (CV+) - P19-2 (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 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

P19-3 (CV+) - P19-2 (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 television camera assembly.
  • The video waveform is constantly output when the engine switch is on (ACC).

RADIO AND DISPLAY RECEIVER ASSEMBLY

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

G2-26 (CSLD) - Body ground

Shield - Body ground

Shield ground

Always

Below 1 V

G2-27 (CGND) - Body ground

G - Body ground

Camera ground

Always

Below 1 V

G2-28 (V+) - G3-1 (GND1)

B - BR

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)

G2-29 (V-) - G3-1 (GND1)

W - BR

Ground

Always

Below 1 V

G2-30 (CA+) - G3-1 (GND1)

R - BR

Television camera assembly power supply

Engine switch on (ACC)

5.5 to 7.05 V

(a) Reference (Oscilloscope waveform):

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

Item

Content

Measurement terminal

G2-28 (V+) - G3-1 (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 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

G2-28 (V+) - G3-1 (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 television camera assembly.
  • The video waveform is constantly output when the engine switch is on (ACC).
    System Diagram

    Lost Communication with ECM / PCM "A" (U0100,U0126,U0140,U0163,U0233)

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