Last Modified: 08-28-2024 6.11:8.1.0 Doc ID: RM1000000018YB3
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: PRE-COLLISION: PRE-COLLISION SYSTEM: TERMINALS OF ECU; 2018 - 2020 MY Sienna [11/2017 -        ]

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

A80-7 (B) - A80-28 (GND)

L - BR

Power source

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

A80-3 (BZ) - A80-28 (GND)

G - BR

Skid control buzzer assembly output

Ignition switch ON, buzzer not sounding

11 to 14 V

Ignition switch ON, buzzer sounding

Below 1 V

A80-28 (GND) - Body ground

BR - 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

A80-8 (CA1P) - A80-28 (GND)

V - BR

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 1)

A80-9 (CA1N) - A80-28 (GND)

W - BR

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 2)

A80-10 (CA2H) - A80-28 (GND)

R - BR

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 1)

A80-11 (CA2L) - A80-28 (GND)

W - BR

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 2)

(1) WAVEFORM 1

Item

Content

Terminal Name

Between A80-8 (CA1P) - A80-28 (GND)

Between A80-10 (CA2H) - A80-28 (GND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

(2) WAVEFORM 2

Item

Content

Terminal Name

Between A80-9 (CA1N) - A80-28 (GND)

Between A80-11 (CA2L) - A80-28 (GND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch ON

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

A77-8 (IGB) - A77-1 (SGND)

L - BR

Power source

Ignition switch ON

11 to 14 V

A77-1 (SGND) - Body ground

BR - 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

A77-3 (CA2H) - A77-1 (SGND)

GR - BR

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 1)

A77-2 (CA2L) - A77-1 (SGND)

W - BR

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 2)

A77-5 (CA1P) - A77-1 (SGND)

R - BR

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 1)

A77-6 (CA1N) - A77-1 (SGND)

W - BR

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 2)

(1) WAVEFORM 1

Item

Content

Terminal Name

Between A77-3 (CA2H) and A77-1 (SGND)

Between A77-5 (CA1P) and A77-1 (SGND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

(2) WAVEFORM 2

Item

Content

Terminal Name

Between A77-2 (CA2L) and A77-1 (SGND)

Between A77-6 (CA1N) and A77-1 (SGND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

FORWARD RECOGNITION CAMERA

Click here 2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: FORWARD RECOGNITION CAMERA SYSTEM: TERMINALS OF ECU