Terminals Of Ecu

DISTANCE CONTROL ECU

Fig 1: Identifying ECU Terminals

G03003689

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ECU TERMINALS VOLTAGE AND RESISTANCE

Symbols (Terminals No.)	Wiring Color	Terminal Description	Condition	Specified Condition
+B - GND (D2-1 - D2-12)	R-B - BR	Battery	Always	10 to 14 V
CANH (D2 - 8)	LG	CAN communication signal	CAN communication circuit	-
CANL (D2 - 9)	L	CAN communication signal	CAN communication circuit	-
SGND - Body ground (D2-10 - Body ground)	BR - Body ground	Ground	Always	Below 1 Ω
GND - Body ground (D2-12 - Body ground)	BR - Body ground	Ground	Always	Below 1 Ω
IGB - GND (D2-13 - D2-12)	L-O - BR	Ignition switch ON signal	Ignition switch OFF --> ON	Below 1 V --> 10 to 14 V
LRDD - GND (D2-22 - D2-12)	P-L - BR	Laser sensor input signal	Ignition switch ON	Pulse generation (see waveform 1)
LRRD - GND (D2-23 - D2-12)	L-Y - BR	Laser sensor output signal	Ignition switch ON	Pulse generation (see waveform 2)

Reference: waveform 1
HINT:
- Terminal: LRDD - GND
- Gauge set: 2 V/DIV, 10 ms/DIV
- Condition: Ignition switch ON
Fig 2: Signal Waveform Graph (Waveform 1)
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Reference: waveform 2
HINT:
- Terminal: LRRD - GND
- Gauge set: 2 V/DIV, 5 ms/DIV
- Condition: Ignition switch ON
Fig 3: Signal Waveform Graph (Waveform 2)
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ECM

Fig 4: Identifying ECM Terminals
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Fig 5: ECM Terminals Voltage And Resistance Chart
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If the value is not within the standard range, some defects on the vehicle are suspected.

LASER SENSOR

Fig 6: Identifying Laser Sensor Terminals

G03003694

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LASER SENSOR TERMINALS VOLTAGE AND RESISTANCE

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
LGND - Body ground (L1-1 - Body ground)	B-L - Body ground	Distance signal	Always	Below 1 Ω
SGND - Body ground (L1-2 - Body ground)	B-R - Body ground	Ground	Always	Below 1 Ω
LRDD - SGND (L1-3 - L1-2)	B-O - B-R	Laser sensor output signal	Ignition switch ON	Pulse generation (see waveform 1)
LRRD - SGND (L1-4 - L1-2)	B-Y - B-R	Laser sensor input signal	Ignition switch ON	Pulse generation (see waveform 2)
IGB - SGND (L1-5 - L1-2)	B - B-R	Power source	Ignition switch ON	10 to 14 V

Reference: waveform 1
HINT:
- Terminal: LRDD - SGND
- Gauge set: 1 V/DIV, 2 ms/DIV
- Condition: Ignition switch ON
Fig 7: Signal Waveform Graph (Waveform 1)
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Reference: waveform 2
HINT:
- Terminal: LRRD - SGND
- Gauge set: 1 V/DIV, 2 ms/DIV
- Condition: Ignition switch ON
Fig 8: Signal Waveform Graph (Waveform 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002