Toyota Avalon Service & Repair Manual: Terminals Of Ecu

TERMINALS OF ECU

CHECK DRIVING SUPPORT ECU ASSEMBLY

(a) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

G39-7 (B) - G39-28 (GND)

B - W-B

Power source

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1 V

G39-28 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(b) Check for pulses according to the value(s) in the table below.

HINT:

If the waveform is not similar to that shown in the illustration, a malfunction of a CAN bus line, terminating resistor, or the driving support ECU assembly is suspected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

G39-8 (CA1P) - G39-28 (GND)

G - W-B

CAN communication signal

Engine switch on (IG)

Pulse generation

(See waveform 1)

G39-9 (CA1N) - G39-28 (GND)

W - W-B

CAN communication signal

Engine switch on (IG)

Pulse generation

(See waveform 2)

G39-10 (CA2H) - G39-28 (GND)

R - W-B

CAN communication signal

Engine switch on (IG)

Pulse generation

(See waveform 1)

G39-11 (CA2L) - G39-28 (GND)

W - W-B

CAN communication signal

Engine switch on (IG)

Pulse generation

(See waveform 2)

(1) WAVEFORM 1

Item

Content

Terminal Name

Between G39-8 (CA1P) - G39-28 (GND)

Between G39-10 (CA2H) - G39-28 (GND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Engine switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

(2) WAVEFORM 2

Item

Content

Terminal Name

Between G39-9 (CA1N) - G39-28 (GND)

Between G39-11 (CA2L) - G39-28 (GND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Engine switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A25-8 (IGB) - A25-1 (SGND)

R - W-B

Power source

Engine switch on (IG)

11 to 14 V

A25-1 (SGND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(b) Check for pulses according to the value(s) in the table below.

HINT:

If the waveform is not similar to that shown in the illustration, a malfunction of a CAN bus line, terminating resistor, or the millimeter wave radar sensor assembly is suspected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A25-3 (CA2H) - A25-1 (SGND)

R - W-B

CAN communication signal

Engine switch on (IG)

Pulse generation

(See waveform 1)

A25-2 (CA2L) - A25-1 (SGND)

W - W-B

CAN communication signal

Engine switch on (IG)

Pulse generation

(See waveform 2)

A25-5 (CA1P) - A25-1 (SGND)

G - W-B

CAN communication signal

Engine switch on (IG)

Pulse generation

(See waveform 1)

A25-6 (CA1N) - A25-1 (SGND)

W - W-B

CAN communication signal

Engine switch on (IG)

Pulse generation

(See waveform 2)

(1) WAVEFORM 1

Item

Content

Terminal Name

Between A25-3 (CA2H) and A25-1 (SGND)

Between A25-5 (CA1P) and A25-1 (SGND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Engine switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

(2) WAVEFORM 2

Item

Content

Terminal Name

Between A25-2 (CA2L) and A25-1 (SGND)

Between A25-6 (CA1N) and A25-1 (SGND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Engine switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

    System Diagram

    Lost Communication with Front Camera Module (U023A)

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