Lexus NX: Visual Mute Signal Circuit between Radio Receiver and Multi-display

Lexus NX Service Manual / Audio & Visual & Telematics / Navigation / Multi Info Display / Navigation System / Visual Mute Signal Circuit between Radio Receiver and Multi-display

DESCRIPTION

The radio receiver assembly sends a visual mute signal to the multi-display assembly. As a result, a black screen is inserted when the screen changes so that noise and distorted images are not displayed.

When an open exists in the circuit, noise and distorted images will be displayed instead of a black screen.

When a short exists in the circuit, even though the multi-display assembly is operating normally, noise and distorted images will be displayed (black screen will not be displayed) during screen changes or the black screen will always be displayed.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Check that the wire harness is properly installed and does not have any sharp bends, pinching or loose connections.
  • When replacing the radio receiver assembly, always replace it with a new one.

    If a radio receiver assembly which was installed to another vehicle is used, the following may occur:

    • A communication malfunction DTC may be stored.
    • The radio receiver assembly may not operate normally.

HINT:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.

Click here

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MULTI-DISPLAY ASSEMBLY)

(a) Disconnect the I42 multi-display assembly connector.

(b) Disconnect the I152 radio receiver assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I42-11 (VMTI) - I152-1 (VMTF)

Always

Below 1 Ω

I42-11 (VMTI) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK RADIO RECEIVER ASSEMBLY

(a) Remove the radio receiver assembly with the connector(s) still connected.

*a

Component with harness connected

(Radio Receiver Assembly)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

I152-1 (VMTF) - Body ground

Power switch on (ACC), screen display changes

3.5 V or higher

→ Below 1 V

→ 3.5 V or higher

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE RADIO RECEIVER ASSEMBLY

READ NEXT:

 Radio Receiver Power Source Circuit

DESCRIPTION This is the power source circuit to operate the radio receiver assembly. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before per

 Remote Touch

 Components

COMPONENTS ILLUSTRATION *1 DECK FLOOR BOX LH *2 NO. 3 DECK BOARD SUB-ASSEMBLY *3 REAR DECK FLOOR BOX *4 NEGATIVE AUXILIARY BATTERY TERMINAL N*m (kgf*cm, ft.*lbf): Specified

SEE MORE:

 Airbag ECU Malfunction (B1000)

DESCRIPTION The airbag ECU assembly consists of a deceleration sensor, safing sensor, drive circuit, diagnosis circuit, ignition control, etc. If the airbag ECU assembly receives signals from the deceleration sensor, it determines whether or not the SRS should be activated. DTC B1000 is stored when

 Assist Map Number Mismatch (C1582)

DESCRIPTION When an incorrect hybrid vehicle control ECU, an incorrect Skid control ECU or an incorrect main body ECU is installed after the assist map has been written in the power steering ECU assembly, then DTC C1582 is stored because the data does not match the vehicle specifications. DTC No.

© 2016-2024 Copyright www.lexunx.com