Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Terminals Of Ecu

TERMINALS OF ECU

NOTICE:

  • DTCs may be output when connectors are disconnected during inspection. Therefore, be sure to clear the DTCs using the Techstream once the inspection has been completed.
  • Do not apply excessive force to the O5 forward recognition camera connector.

CHECK FORWARD RECOGNITION CAMERA

(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

O5-7 (IGB) - O5-10 (GND)

LA-P - LA

Power source

Power switch on (IG)

11 to 14 V

Power switch off

Below 1 V

O5-10 (GND) - Body ground

LA - 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 forward recognition camera is suspected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

O5-5 (CA1P) - O5-10 (GND)

L - LA

CAN communication signal

Power switch on (IG)

Pulse generation

(See waveform 1)

O5-11 (CA1N) - O5-10 (GND)

W - LA

CAN communication signal

Power switch on (IG)

Pulse generation

(See waveform 2)

O5-6 (CANH) - O5-10 (GND)

G - LA

CAN communication signal

Power switch on (IG)

Pulse generation

(See waveform 1)

O5-12 (CANL) - O5-10 (GND)

W - LA

CAN communication signal

Power switch on (IG)

Pulse generation

(See waveform 2)

(1) WAVEFORM 1

Item

Content

Terminal Name

Between O5-5 (CA1P) and O5-10 (GND)

Between O5-6 (CANH) and O5-10 (GND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Power switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

(2) WAVEFORM 2

Item

Content

Terminal Name

Between O5-11 (CA1N) and O5-10 (GND)

Between O5-12 (CANL) and O5-10 (GND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Power switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

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

Power switch on (IG)

11 to 14 V

Power switch off

Below 1 V

G39-23 (SPSW) - G39-28 (GND)

R - W-B

Steering pad switch signal

(Lane departure alert main switch signal)

Power switch off

Lane departure alert main switch off

1 MΩ or higher

Power switch off

Lane departure alert main switch on

228 to 252 Ω

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

Power switch on (IG)

Pulse generation

(See waveform 1)

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

W - W-B

CAN communication signal

Power switch on (IG)

Pulse generation

(See waveform 2)

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

R - W-B

CAN communication signal

Power switch on (IG)

Pulse generation

(See waveform 1)

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

W - W-B

CAN communication signal

Power 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

Power 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

Power 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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