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)

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