Toyota Avalon Service & Repair Manual: Terminals Of Ecu

TERMINALS OF ECU

STEREO COMPONENT EQUALIZER ASSEMBLY

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

G68-1 (CANH)

P

CAN communication signal

-

-

G68-2 (ACK1)

V

Serial communication (UART) signal

-

-

G68-3 (NEI) - G68-28 (GND)

LA-B - W-B

Engine pulse signal

Idling with warm engine

Pulse generation

(See waveform 1)

G68-5 (MC3+) - G68-28 (GND)

R - W-B

Active noise control microphone input signal

No. 3 active noise control microphone tapped with finger

Pulse generation

G68-6 (MC2+) - G68-28 (GND)

B - W-B

Active noise control microphone input signal

No. 2 active noise control microphone tapped with finger

Pulse generation

G68-7 (MC1+) - G68-28 (GND)

V - W-B

Active noise control microphone input signal

No. 1 active noise control microphone tapped with finger

Pulse generation

G68-10 (CH3+) - G68-28 (GND)

SB - W-B

Active noise control microphone output signal

Active noise control system operating

Pulse generation

G68-11 (CH2+) - G68-28 (GND)

L - W-B

Active noise control microphone output signal

Active noise control system operating

Pulse generation

G68-12 (CH1+) - G68-28 (GND)

Y - W-B

Active noise control microphone output signal

Active noise control system operating

Pulse generation

G68-13 (ACC) - G68-28 (GND)

P - W-B

Power source (ACC)

Engine switch on (ACC)

11 to 14 V

G68-14 (+B) - G68-28 (GND)

LA-G - W-B

Power source

Always

11 to 14 V

G68-15 (CANL)

W

CAN communication signal

-

-

G68-16 (ACK2)

BE

Serial communication (UART) signal

-

-

G68-17 (ACNT) - G68-28 (GND)

SB - W-B

Active noise control system control signal

Engine switch on (IG)

Below 1 V

Engine switch on (ACC)

4.5 V or higher

G68-19 (MC3-) - G68-28 (GND)

G - W-B

Active noise control microphone input signal

Always

Below 1 Ω

G68-20 (MC2-) - G68-28 (GND)

P - W-B

Active noise control microphone input signal

Always

Below 1 Ω

G68-21 (MC1-) - G68-28 (GND)

LG - W-B

Active noise control microphone input signal

Always

Below 1 Ω

G68-24 (CH3-) - G68-28 (GND)

P - W-B

Active noise control microphone output signal

Active noise control system operating

Pulse generation

G68-25 (CH2-) - G68-28 (GND)

V - W-B

Active noise control microphone output signal

Active noise control system operating

Pulse generation

G68-26 (CH1-) - G68-28 (GND)

LG - W-B

Active noise control microphone output signal

Active noise control system operating

Pulse generation

G68-27 (IGN) - G68-28 (GND)

LA-SB - W-B

Power source (IG)

Engine switch on (IG)

11 to 14 V

G68-28 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(a) Waveform 1

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only. The waveform fluctuates according to engine speed.

Item

Condition

Measurement terminal

G68-3 (NEI) - G68-28 (GND)

Tool setting

5 V/DIV., 20 ms./DIV.

Vehicle condition

Idling after warming up

STEREO COMPONENT AMPLIFIER ASSEMBLY

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

G69-2 (ACK1)

GR

Serial communication (UART) signal

-

-

G69-3 (ACNT)

B

Active noise control system control signal

Active noise control system operating

Below 1 V

Active noise control system not operating

4.5 V or higher

G69-6 (AN3+)

G

Active noise control microphone input signal

Active noise control system operating

Pulse generation

G69-7 (AN2+)

R

Active noise control microphone input signal

Active noise control system operating

Pulse generation

G69-8 (AN1+)

W

Active noise control microphone input signal

Active noise control system operating

Pulse generation

G69-10 (ACK2)

V

Serial communication (UART) signal

-

-

G69-13 (ASG1)

Shielded - W-B

Shield ground

Always

Below 1 Ω

G69-14 (AN3-)

GR

Active noise control microphone input signal

Active noise control system operating

Pulse generation

G69-15 (AN2-)

L

Active noise control microphone input signal

Active noise control system operating

Pulse generation

G69-16 (AN1-)

B

Active noise control microphone input signal

Active noise control system operating

Pulse generation

    System Diagram

    Lost Communication With ECM/PCM "A" Missing Message (U010087,U012987,U014087)

    See More:

    Toyota Avalon Service & Repair Manual > Can Communication System(for Hv Model): Open in One Side of Bus 5 Branch Line
    DESCRIPTION When the CAN bus main lines are normal (no open, short to ground, short to +B or short between lines) and there is an ECU or sensor on the "Communication Bus Check" screen that is indicated as not communicating or whose connection status on the "Communication Bus Check" screen changes in ...

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