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 / Front Camera System / Terminals Of Ecu

TERMINALS OF ECU

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

U14-1 (HTR) - U14-10 (GND)

B - BR

Forward recognition with heater hood sub-assembly operation signal

Engine switch on (IG)

Forward recognition with heater hood sub-assembly not operating

11 to 14 V

Engine switch on (IG)

Forward recognition with heater hood sub-assembly operating

Below 1 V

U14-7 (IGB) - U14-10 (GND)

SB - BR

Power source

Engine switch on (IG)

11 to 14 V

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

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.

CHECK STEERING VIBRATION ECU

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.

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

z11-4 (IG) - z11-1 (GND)

Power source

Engine switch on (IG)

Pulse generation

Engine switch off

Below 1 V

B-1 (M+) - z11-1 (GND)

Steering vibration operation signal

Engine switch on (IG)

Steering vibration operating

11 to 14 V

Engine switch on (IG)

Steering vibration not operating

Below 1 V

z11-1 (GND) - Body ground

Ground

Always

Below 1 Ω

(b) Measure the waveform according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

A-2 (LDA) - z11-1 (GND)

LIN communication signal

Engine switch on (IG)

Pulse generation
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