Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Terminals Of Ecu

TERMINALS OF ECU

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J157-1 (+B) - J157-20 (E)

Y - W-B

Power source (+B)

Always

11 to 14 V

J157-3 (SIG-) - J157-20 (E)

G - W-B

Ground

Always

Below 1 V

J157-4 (IND1) - J157-20 (E)

LG - W-B

Manual (SOS) switch red indicator illumination signal

For 2 seconds after turning the engine switch on (IG)

1 to 8.5 V

Engine switch off

Below 1 V

J157-5 (MCVD) - J157-20 (E)

L - W-B

Telephone microphone assembly power supply

Engine switch on (ACC)

4 to 6 V

Engine switch off

Below 1 V

J157-6 (MCI+) - J157-20 (E)

P - W-B

Receive microphone voice signal

Voice being input to telephone microphone assembly

A waveform synchronized with microphone voice signal is input

J157-7 (MCI-) - J157-20 (E)

G - W-B

Receive microphone voice signal

Always

Below 1 V

J157-13 (GSW) - J157-20 (E)

L - W-B

Collision detection signal

Engine switch on (IG)

Pulse generation (Refer to waveform1)

J157-19 (IG2) - J157-20 (E)

B - W-B

Power source (IG)

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1 V

J157-20 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

J157-21 (SIG1) - J157-3 (SIG-)

R - G

Manual (SOS) switch button condition signal

Manual (SOS) switch not pressed

1.3 to 1.9 V

Manual (SOS) switch pressed

0.5 to 0.8 V

J157-22 (IND2) - J157-20 (E)

V - W-B

Manual (SOS) switch green indicator illumination signal

For 2 seconds after turning the engine switch on (IG)

1 to 8.5 V

Engine switch off

Below 1 V

J157-23 (SGND) - J157-20 (E)

Shielded - W-B

Shield ground

Always

Below 1 Ω

J157-25 (CANP)

R

CAN communication signal

-

-

J157-26 (CANN)

W

CAN communication signal

-

-

CHECK DCM (TELEMATICS TRANSCEIVER)

(a) Oscilloscope waveform:

(1) Waveform 1

Item

Condition

Tester connection

J157-13 (GSW) - J157-20 (E)

Tool setting

5.0 V/DIV., 20 ms/DIV.

Vehicle condition

Engine switch on (IG)

CHECK RADIO RECEIVER ASSEMBLY

w/o Navigation System: Click here

w/ Navigation System: Click here

    Diagnosis System
    DIAGNOSIS SYSTEM DESCRIPTION (a) The DCM (telematics transceiver) control the vehicle safety connect system functions. Safety connect system data and Diagnostic Trouble Codes (DTCs) can be read throug ...

    Dtc Check / Clear
    DTC CHECK / CLEAR CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Telematics / Troubl ...

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

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

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