Terminals Of Ecu

WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

DISTANCE CONTROL ECU

Fig 1: Identifying Distance Control ECU Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

SPECIFIED CONDITION CHART

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: Terminal: LRDD - GND Waveform
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Reference: waveform 2
HINT:
- Terminal: LRRD - GND
- Gauge set: 2 V/DIV, 5 ms/DIV
- Condition: Ignition switch ON
  
  Fig 3: Terminal: LRRD - GND Waveform
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

ECM

Fig 4: Identifying ECM Terminal Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

SPECIFIED CONDITION CHART

Symbols (Terminals No.)	Wiring Color	Terminal Description	Condition	Specified Condition
STP - E1 (E2-4 - E6-7)	G-O - BR	Stop lamp signal	Brake pedal released (Stop lamp switch OFF) --> Brake pedal depressed (Stop lamp switch ON)	Below 1 V --> 10 to 14 V
CCS - E1 (E2-31 - E6-7)	W-L - BR	Cruise control main switch signal	Ignition switch ON CANCEL switch ON SET/COAST switch ON RES/ACC switch ON Main switch ON	10 to 16 V 6.6 to 10.1 V 4.5 to 7.1 V 2.3 to 4.0 V Below 1 V
ST1- - E1 (E3-8 - E6-7)	V-Y - BR	Stop lamp signal	Ignition switch ON Brake pedal depressed (Stop lamp switch ON) --> Brake pedal released (Stop lamp switch OFF)	Below 1 V --> 10 to 14 V
CCHG - E1 (E3-20 - E6-7)	V - BR	Distance control switch signal	Ignition switch ON Cruise control main switch ON MODE switch ON --> MODE switch OFF	Below 1 V --> 10 to 14 V
LGND - Body ground (E3-29 - Body ground)	BR-Y - Body ground	Ground	Always	Below 1 Ω
E1 - Body ground (E6-7 - Body ground)	BR - Body ground	Ground	Always	Below 1 Ω

If the value is not within the standard range, some defects on the vehicle are suspected.

LASER SENSOR

Fig 5: Identifying Laser Sensor Connector Terminal

SPECIFIED CONDITION CHART

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