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 / Lane Control 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

U14-3 (LKSW) - U14-10 (GND)

GR - BR

Steering pad switch signal

(LTA main switch signal)

Engine switch off

LTA main switch off

1 MΩ or higher

Engine switch off

LTA main switch on

228 to 252 Ω

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

SB - BR

Power source

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1 V

U14-10 (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.

    Problem Symptoms Table
    PROBLEM SYMPTOMS TABLE HINT: If CAN communication system and lane control system DTCs are not output and any of the following problem symptoms exist, perform troubleshooting by checking the appropr ...

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    DIAGNOSIS SYSTEM FUNCTION OF INDICATOR AND WARNING MESSAGE (a) If the lane control system is not functioning properly, the driver is warned through the LTA indicator and a warning message is displayed ...

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