Lexus NX: Terminals Of Ecu

TERMINALS OF ECU

CHECK DCM (TELEMATICS TRANSCEIVER)

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

I183-1 (+B) - I183-20 (E)

Y - W-B

Power source (+B)

Power switch off

11 to 14 V

I183-3 (SIG-) - I183-20 (E)

G - W-B

Ground

Always

Below 1 V

I183-4 (IND1) - I183-20 (E)

LG - W-B

Manual (SOS) switch red indicator illumination signal

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

1 to 8.5 V

Power switch off

Below 1 V

I183-5 (MCVD) - I183-20 (E)

B - W-B

Telephone microphone assembly power supply

Power switch on (IG)

4 to 6 V

Power switch off

Below 1 V

I183-6 (MCI+) - I183-20 (E)

W - W-B

Receive microphone voice signal

Voice being input to telephone microphone assembly

A waveform synchronized with microphone voice signal is input

I183-7 (MCI-) - I183-20 (E)

R - W-B

Receive microphone voice signal

Always

Below 1 V

I183-13 (GSW) - I183-20 (E)

BE - W-B

Collision detection signal

Power switch on (IG)

Pulse generation (Refer to waveform 1)

I183-14 (MUTE) - I183-20 (E)

B - W-B

MUTE Signal

Audio system playing

3.5 V or higher

Emergency call mode

Below 1 V

I183-15 (USBV) - I183-20 (E)

G - W-B

DCM (telematics transceiver) power supply signal

Power switch on (IG)

4.75 to 5.25 V

Power switch off

Below 1 V

I183-16 (MCO+) - I183-20 (E)

G - W-B

Microphone voice signal

Voice being input to telephone microphone assembly

A waveform synchronized with microphone voice signal is input

I183-17 (VOT+) - I183-20 (E)

R - W-B

Sent voice signal

Calling while using the operator service

A waveform synchronized with the received voice is output

I183-18 (VOR+) - I183-20 (E)

B - W-B

Receive voice signal

Receiving a call while using the operator service

A waveform synchronized with the sent voice is output

I183-19 (IG2) - I183-20 (E)

R - W-B

Power source (IG)

Power switch on (IG)

11 to 14 V

Power switch off

Below 1 V

I183-20 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

I183-21 (SIG1) - I183-3 (SIG-)

V - 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

I183-22 (IND2) - I183-20 (E)

L - W-B

Manual (SOS) switch green indicator illumination signal

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

1 to 8.5 V

Power switch off

Below 1 V

I183-23 (SGND) - I183-20 (E)

Shielded - W-B

Shield ground

Always

Below 1 Ω

I183-25 (CANP)

Y

CAN communication signal

-

-

I183-26 (CANN)

W

CAN communication signal

-

-

I183-31 (USBG) - Body ground

P - Body ground

Shield ground

Always

Below 1 Ω

I183-32 (MCO-) - I183-20 (E)

R - W-B

Microphone voice signal

Always

Below 1 V

I183-33 (VOT-) - I183-20 (E)

G - W-B

Sent voice signal

Calling while using the operator service

A waveform synchronized with the received voice is output

I183-34 (VOR-) - I183-20 (E)

W - W-B

Receive voice signal

Receiving a call while using the operator service

A waveform synchronized with the sent voice is output

I184-1 (SPI+) - I183-20 (E)

P - W-B*1

W - W-B*2

Sound signal

Audio system playing

A waveform synchronized with sound signals is output

I184-2 (SPI-) - I183-20 (E)

R - W-B

Sound signal

Audio system playing

A waveform synchronized with sound signals is output

I184-3 (SPO+) - I183-20 (E)

Y - W-B*1

R - W-B*2

Sound signal

Audio system playing, or emergency call mode

A waveform synchronized with sound signals is output

I184-4 (SPO-) - I183-20 (E)

B - W-B*1

W - W-B*2

Sound signal

Audio system playing, or emergency call mode

A waveform synchronized with sound signals is output

I185-1 (USB-)

#

USB communication line

-

-

I185-2 (USB+)

#

USB communication line

-

-

I185-3 (USBS) - Body ground

Shielded - Body ground

Shield ground

Always

Below 1 Ω

  • *1: w/ Navigation System
  • *2: w/o Navigation System
  • #: There is no wire color information

(a) Oscilloscope waveform:

(1) Waveform 1

Item

Condition

Tester connection

I183-13 (GSW) - I183-20 (E)

Tool setting

5.0 V/DIV., 20 ms./DIV.

Vehicle condition

Power switch on (IG)

CHECK RADIO RECEIVER ASSEMBLY

w/ Navigation System: Click here

w/o Navigation System: Click here

CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY

w/ Navigation System: Click here

w/o Navigation System: Click here

CHECK NAVIGATION ECU (w/ Navigation System)

Click here

READ NEXT:

 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 power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Telematics / Trouble

 Data List / Active Test

DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a pa

SEE MORE:

 Removal

REMOVAL CAUTION / NOTICE / HINT HINT: Use the same procedure for the LH side and RH side. The following procedure is for the LH side. PROCEDURE 1. RELEASE PARKING BRAKE Click here 2. REMOVE REAR WHEEL Click here 3. REMOVE NO. 2 TOOL BOX SUB-ASSEMBLY Click here 4. REMOVE REAR SPEED SENS

 Installation

INSTALLATION PROCEDURE 1. INSTALL TIRE PRESSURE MONITOR INITIATOR DRIVER (a) Attach the 2 claws to install the tire pressure monitor initiator driver. 2. INSTALL ECU INTEGRATION BOX RH (a) Install the ECU integration box RH with the 2 nuts and bolt. Torque: 5.5 N·m {56 kgf·cm, 49 in·lbf} (b) Con

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