Terminals Of Ecu

WARNING: This page is about a different car, the 2011 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DRIVING SUPPORT ECU

Fig 1: Identifying C1 Connector Terminal Identification

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
C1-30 (+B) - C1-25 (GND)	P - W-B	Battery	Always	11 to 14 V
C1-39 (CA2H) - C1-25 (GND)	B - W-B	CAN communication signal	CAN communication circuit	Pulse generation
C1-17 (CA2L) - C1-25 (GND)	W - W-B	CAN communication signal	CAN communication circuit	Pulse generation
C1-25 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 V
C1-7 (MODE) - C1-25 (GND)	Y - W-B	Steering pad switch signal (Distance control switch signal)	Engine switch on (IG), Steering pad switch signal ON	0 to 2 V
C1-7 (MODE) - C1-25 (GND)	Y - W-B	Steering pad switch signal (Distance control switch signal)	Engine switch on (IG), Steering pad switch signal OFF	11 to 14 V
C1-16 (LRDD) - C1-25 (GND)	GR - W-B	Millimeter wave radar sensor input signal	Engine switch on (IG)	Pulse generation (See Fig 2waveform 1)
C1-38 (LRRD) - C1-25 (GND)	LG - W-B	Millimeter wave radar sensor output signal	Engine switch on (IG)	Pulse generation (See Fig 3waveform 2)
C1-32 (WIP2) - C1-25 (GND)	SB - W-B	Wiper switch signal	Engine switch on (IG), wiper switch HI position	11 to 14 V
C1-32 (WIP2) - C1-25 (GND)	SB - W-B	Wiper switch signal	Engine switch on (IG), wiper switch LO position	Below 1 V

Reference: waveform 1

Fig 2: Identifying Reference Voltage Waveform 1
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:
- Terminal: C1-16 (LRDD) - C1-25 (GND)
- Gauge set: 2 V/DIV., 10 msec./DIV.
- Condition: Engine switch on (IG)
Reference: waveform 2

Fig 3: Identifying Reference Voltage Waveform 2
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:
- Terminal: C1-38 (LRRD) - C1-25 (GND)
- Gauge set: 2 V/DIV., 5 msec./DIV.
- Condition: Engine switch on (IG)

CHECK ECM (for 2GR-FE)

Fig 4: Identifying D1 & A43

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A43-16 (TC) - D1-81 (E1)	L - BR	Terminal TC of DLC3	Engine switch on (IG)	10 to 14 V
A43-16 (TC) - D1-81 (E1)	L - BR	Terminal TC of DLC3	Terminals TC and CG of DLC3 connected	Below 1 V
A43-35 (ST1-) - D1-81 (E1)	BR - BR	Stop light signal	Engine switch on (IG), Brake pedal depressed (Stop light switch on)	Below 1 V
A43-35 (ST1-) - D1-81 (E1)	BR - BR	Stop light signal	Engine switch on (IG), Brake pedal released (Stop light switch off)	10 to 14 V
A43-36 (STP) - D1-81 (E1)	B - BR	Stop light signal	Engine switch on (IG), Brake pedal released (Stop light switch off)	Below 1 V
A43-36 (STP) - D1-81 (E1)	B - BR	Stop light signal	Engine switch on (IG), Brake pedal depressed (Stop light switch on)	10 to 14 V
A43-37 (CCHG) - D1-81 (E1)	GR - BR	Distance control switch signal	Engine switch on (IG), Cruise control main switch on, MODE switch on	Below 1 V
A43-37 (CCHG) - D1-81 (E1)	GR - BR	Distance control switch signal	Engine switch on (IG), Cruise control main switch on, MODE switch off	10 to 14 V
A43-44 (LGND) - Body ground	V - Body ground	Ground	Always	Below 1 Ω
A43-45 (CCS) - D1-81 (E1)	P - BR	Cruise control main switch signal	Engine switch on (IG)	10 to 14 V
A43-45 (CCS) - D1-81 (E1)	P - BR	Cruise control main switch signal	Engine switch on (IG), CANCEL switch on	6.6 to 10.1 V
A43-45 (CCS) - D1-81 (E1)	P - BR	Cruise control main switch signal	Engine switch on (IG), - SET switch on	4.5 to 7.1 V
A43-45 (CCS) - D1-81 (E1)	P - BR	Cruise control main switch signal	Engine switch on (IG), + RES switch on	2.3 to 4.0 V
A43-45 (CCS) - D1-81 (E1)	P - BR	Cruise control main switch signal	Engine switch on (IG), Main switch on	Below 1 V
D1-81 (E1) - Body ground	BR - Body ground	Ground	Always	Below 1 Ω

If the value is not within the specified range, the ECM may have a malfunction.