Toyota CH-R Service Manual: Terminals Of Ecu

TERMINALS OF ECU

CHECK MILLIMETER WAVE RADAR SENSOR

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

HINT:

If the result is not as specified, there may be a malfunction on the wire harness side.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A2-8 (IGB) - A2-1 (SGND)

B - W-B

Power source

Ignition switch ON

11 to 14 V

A2-1 (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.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A2-3 (CA2H) - A2-1 (SGND)

G - W-B

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 1)

A2-2 (CA2L) - A2-1 (SGND)

GR - W-B

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 2)

A2-5 (CA1P) - A2-1 (SGND)

G - W-B

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 1)

A2-6 (CA1N) - A2-1 (SGND)

R - W-B

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 2)

(c) WAVEFORM 1

(1) CAN communication signal

Item

Content

Terminal Name

Between A2-3 (CA2H) and A2-1 (SGND)

Between A2-5 (CA1P) and A2-1 (SGND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

(d) WAVEFORM 2

(1) CAN communication signal

Item

Content

Terminal Name

Between A2-2 (CA2L) and A2-1 (SGND)

Between A2-6 (CA1N) and A2-1 (SGND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

CHECK FORWARD RECOGNITION CAMERA

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

HINT:

If the result is not as specified, there may be a malfunction on the wire harness side.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

R5-8 (BZ) - R5-10 (GND)

B - W-B

Pre-collision city buzzer

Ignition switch ON, pre-collision city buzzer not operating

11 to 14 V

Ignition switch ON, pre-collision city buzzer operating

0 to 1.5 V

R5-3 (LKSW) - R5-10 (GND)

R - W-B

Pre-collision system cancel switch assembly

Pre-collision system cancel switch assembly being pressed

Below 1 Ω

Pre-collision system cancel switch assembly not being pressed

100 kΩ or higher

R5-7 (IGB) - R5-10 (GND)

B - W-B

Power source

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

R5-10 (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.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

R5-5 (CA1P) - R5-10 (GND)

R - W-B

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 1)

R5-6 (CANH) - R5-10 (GND)

G - W-B

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 1)

R5-11 (CA1N) - R5-10 (GND)

GR - W-B

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 2)

R5-12 (CANL) - R5-10 (GND)

R - W-B

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 2)

(c) WAVEFORM 1

(1) CAN communication signal

Item

Content

Terminal Name

Between R5-5 (CA1P) - R5-10 (GND)

Between R5-6 (CANH) - R5-10 (GND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

(d) WAVEFORM 2

(1) CAN communication signal

Item

Content

Terminal Name

Between R5-11 (CA1N) - R5-10 (GND)

Between R5-12 (CANL) - R5-10 (GND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

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