Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Terminals Of Ecu

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Engine & Hybrid System / Cruise Control / Dynamic Radar Cruise Control System / Terminals Of Ecu

TERMINALS OF ECU

CHECK ECM

HINT:

As a waterproof connector is used for the ECM, voltage, resistance and waveform inspections cannot be performed. The voltage, resistance and waveform values are provided for reference only.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A37-27 (STP) - D2-53 (E1)	Y - BR	Stop light switch assembly signal	Brake pedal depressed	11 to 14 V
A37-27 (STP) - D2-53 (E1)	Y - BR	Stop light switch assembly signal	Brake pedal released	Below 1 V
A37-41 (CCS) - D2-53 (E1)	B - BR	Cruise control main switch circuit	Cruise control main switch (ON/OFF button) not pushed	1 MΩ or higher
			Cruise control main switch (ON/OFF button) pushed	Below 2.5 Ω
			+RES switch ON	235 to 245 Ω
			-SET switch ON	617 to 643 Ω
			CANCEL switch ON	1509 to 1571 Ω
A37-42 (ST1-) - D2-53 (E1)	BR - BR	Stop light switch assembly signal	Engine switch on (IG), brake pedal depressed	Below 1 V
A37-42 (ST1-) - D2-53 (E1)	BR - BR	Stop light switch assembly signal	Engine switch on (IG), brake pedal released	11 to 14 V

CHECK FORWARD RECOGNITION CAMERA

NOTICE:

DTCs may be output when connectors are disconnected during inspection. Therefore, be sure to clear the DTCs using the Techstream once the inspection has been completed.
Do not apply excessive force to the forward recognition camera connector.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
U14-3 (LKSW) - U14-10 (GND)	GR - BR	Steering pad switch assembly signal (distance control signal)	Engine switch on (IG), steering pad switch assembly (vehicle-to-vehicle distance control switch) on	Below 1 V
U14-3 (LKSW) - U14-10 (GND)	GR - BR		Engine switch on (IG), steering pad switch assembly (vehicle-to-vehicle distance control switch) off	4.75 to 5.25 V
U14-7 (IGB) - U14-10 (GND)	SB - BR	Power source	Engine switch on (IG)	11 to 14 V
U14-7 (IGB) - U14-10 (GND)	SB - BR	Power source	Engine switch off	Below 1 V
U14-8 (BZ) - U14-10 (GND)	W - BR	Skid control buzzer assembly output	Engine switch on (IG), buzzer not sounding	11 to 14 V
U14-8 (BZ) - U14-10 (GND)	W - BR	Skid control buzzer assembly output	Engine switch on (IG), buzzer sounding	Below 1 V
U14-10 (GND) - Body ground	BR - Body ground	Ground	Always	Below 1 Ω

(b) Check for pulses according to the value(s) in the table below.

HINT:

If the waveform is not similar to that shown in the illustration, a malfunction of a CAN bus line, terminating resistor, or the forward recognition camera is suspected.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
U14-5 (CA1P) - U14-10 (GND)	V - BR	CAN communication signal	Engine switch on (IG)	Pulse generation (See waveform 1)
U14-6 (CANH) - U14-10 (GND)	B - BR	CAN communication signal	Engine switch on (IG)	Pulse generation (See waveform 1)
U14-11 (CA1N) - U14-10 (GND)	P - BR	CAN communication signal	Engine switch on (IG)	Pulse generation (See waveform 2)
U14-12 (CANL) - U14-10 (GND)	W - BR	CAN communication signal	Engine switch on (IG)	Pulse generation (See waveform 2)

(1) Waveform 1

Item	Content
Tester Connection	Between U14-5 (CA1P) and U14-10 (GND) Between U14-6 (CANH) and U14-10 (GND)
Tool Setting	1 V/DIV., 10 μs./DIV.
Condition	Engine switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

(2) Waveform 2

Item	Content
Tester Connection	Between U14-11 (CA1N) and U14-10 (GND) Between U14-12 (CANL) and U14-10 (GND)
Tool Setting	1 V/DIV., 10 μs./DIV.
Condition	Engine switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

Diagnosis System

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Dtc Check / Clear

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Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Terminals Of Ecu

Diagnosis System

Dtc Check / Clear

Other materials:

Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual