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.

Problem Symptoms Table
Diagnosis SystemToyota CH-R Service Manual > Rear View Monitor System: Diagnosis System
DIAGNOSIS SYSTEM
DESCRIPTION
(a) Diagnostic Trouble Codes (DTCs) can be read from the Data Link Connector
3 (DLC3) of the vehicle. When the rear view monitor system seems to be malfunctioning,
use the Techstream to check for malfunctions and to perform repairs.
CHECK DLC3
(a) Check the DLC3. ...
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ILLUSTRATION
*1
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*2
ECM
ILLUSTRATION
*1
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*2
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