Lexus NX: NTSC Disconnected (from Park Assist/Monitoring ECU) (B1535,C1622)

Lexus NX Service Manual / Audio & Visual & Telematics / Navigation / Multi Info Display / Navigation System / NTSC Disconnected (from Park Assist/Monitoring ECU) (B1535,C1622)

DESCRIPTION

This DTC is stored if the radio receiver assembly judges that the signals or signal lines between the television camera assembly and the multi-display assembly are not normal as a result of its self check.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1535

NTSC Disconnected (from Park Assist/Monitoring ECU)

Open or short in the television camera assembly signal circuit

  • Harness or connector
  • Television camera assembly
  • Multi-display assembly
  • Radio receiver assembly

C1622

Back Camera Disconnected

Open or short in the television camera assembly signal circuit

  • Harness or connector
  • Television camera assembly
  • Multi-display assembly
  • Radio receiver assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • If the cable was disconnected from and reconnected to the negative (-) auxiliary battery terminal, the estimated course lines may not be displayed on the image of the area behind the vehicle. In this case, perform "Correct the Steering Angle Neutral Point".

    Click here

  • Depending on the parts that are replaced or operations that are performed during vehicle inspection or maintenance, calibration of other systems as well as the parking assist monitor system may be needed.

    Click here

  • 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 (TELEVISION CAMERA ASSEMBLY - MULTI-DISPLAY ASSEMBLY)

(a) Disconnect the Y25 television camera assembly connector.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Y25-6 (CB+) - I42-10 (CA+)

Always

Below 1 Ω

Y25-3 (CV+) - I42-8 (V+)

Always

Below 1 Ω

Y25-2 (CV-) - I42-9 (V-)

Always

Below 1 Ω

Y25-5 (CGND) - I42-21 (CGND)

Always

Below 1 Ω

Y25-6 (CB+) or I42-10 (CA+) - Body ground

Always

10 kΩ or higher

Y25-3 (CV+) or I42-8 (V+) - Body ground

Always

10 kΩ or higher

Y25-2 (CV-) or I42-9 (V-) - Body ground

Always

10 kΩ or higher

Y25-5 (CGND) or I42-21 (CGND) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK MULTI-DISPLAY ASSEMBLY (CA+, CGND)

(a) Remove the multi-display assembly with the connector still connected.

Click here

*a

Component with harness connected

(Multi-display Assembly)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

I42-10 (CA+) - I42-21 (CGND)

Power switch on (ACC)

5.5 to 7.05 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I42-21 (CGND) - Body ground

Always

Below 1 Ω

NG

REPLACE MULTI-DISPLAY ASSEMBLY

OK

3.

CHECK TELEVISION CAMERA ASSEMBLY

*a

Component with harness connected

*b

Waveform 1

*c

Waveform 2

*d

Synchronization Signal

*e

Video Waveform

-

-

(a) Remove the multi-display assembly with the connector still connected.

Click here

(b) Check the waveform of the television camera assembly using an oscilloscope.

Item

Content

Measurement terminal

I42-8 (V+) - I42-9 (V-)

Measurement setting

200 mV/DIV., 50 μsec./DIV.

Condition

Waveform 1: Power switch on (READY), shift position in R, camera lens is not covered, displaying an image.

Waveform 2: Power switch on (READY), shift position in R, camera lens is covered, blacking out the screen.

HINT:

  • The video waveform changes according to the image sent by the television camera assembly.
  • The video waveform is constantly output when the power switch is on (ACC).

OK:

Waveform is as shown in the illustration.

NG

REPLACE TELEVISION CAMERA ASSEMBLY

OK

4.

CHECK MULTI-DISPLAY ASSEMBLY

(a) Replace the multi-display assembly with a new or known good one.

Click here

(b) Clear the DTCs.

Click here

Body Electrical > Navigation System > Clear DTCs

(c) Check for DTCs and check that no DTCs are output.

Click here

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

OK

END (MULTI-DISPLAY ASSEMBLY IS DEFECTIVE)

NG

REPLACE RADIO RECEIVER ASSEMBLY

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