NAVIGATION SYSTEM(for Radio and Display Type), Diagnostic DTC:B1532

DTC Code DTC Name
B1532 LVDS Signal Malfunction (from Extension Module)

DESCRIPTION

The navigation ECU and the radio and display receiver assembly are connected by the LVDS communication line.

This DTC is stored when an LVDS communication error occurs between the navigation ECU and the radio and display receiver assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1532

LVDS Signal Malfunction (from Extension Module)

When one of the conditions below is met:

  • Video signal (digital) is lost.

  • Navigation ECU is/was not connected while the ignition switch is/was to ON or ACC.

  • Communication between the master unit and the navigation ECU is/was not possible when the engine is/was started.

  • Navigation ECU power source circuit

  • LVDS circuit between radio and display receiver assembly and navigation ECU

  • Navigation ECU

  • Radio and display receiver assembly

  • No. 1 navigation wire
Tip:

  • Even if no fault is present, this DTC may be stored depending on the battery condition or engine start voltage.

  • The radio and display receiver assembly is the master unit.

WIRING DIAGRAM

E292617E03

CAUTION / NOTICE / HINT

Note:

Check that the wire harness is properly installed and does not have any sharp bends, pinching or loose connections.

Click hereClick here

PROCEDURE

  1. CHECK NO. 1 NAVIGATION WIRE (NAVIGATION ECU POWER SOURCE)

    1. E291690C03

      *a

      Front view of wire harness connector

      (to Navigation ECU)

      Disconnect the navigation ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Y5-2 (GND) - Body ground

      Always

      Below 1 Ω

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      Y5-1 (B+) - Y5-2 (GND)

      Always

      11 to 14 V

      Y5-3 (ACC) - Y5-2 (GND)

      Ignition switch ACC

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    CHECK NO. 1 NAVIGATION WIRE (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU)Click here

    OK

  2. REPLACE NO. 1 NAVIGATION WIRE (LVDS COMMUNICATION LINE)

    1. Replace the No. 1 navigation wire (LVDS communication line).

      Click here

    2. Clear the DTCs.

      Click hereClick here

      Body Electrical > Navigation System > Clear DTCs

    3. Check for DTCs.

      Click hereClick here

      Body Electrical > Navigation System > Trouble Codes

      OK

      No DTCs are output.

    Result

    Proceed to

    OK

    NG
    OK

    END (NO. 1 NAVIGATION WIRE [LVDS COMMUNICATION LINE] IS DEFECTIVE)

    NG

    REPLACE NAVIGATION ECUClick here

  3. CHECK NO. 1 NAVIGATION WIRE (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU)

    1. Disconnect the Y1 radio and display receiver assembly connector.

    2. Disconnect the Y5 navigation ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Y1-4 (+B2) - Y5-1 (B+)

      Always

      Below 1 Ω

      Y1-3 (ACC2) - Y5-3 (ACC)

      Always

      Below 1 Ω

      Y1-8 (GND2) - Y5-2 (GND)

      Always

      Below 1 Ω

      Y1-4 (+B2) - Body ground

      Always

      10 kΩ or higher

      Y1-3 (ACC2) - Body ground

      Always

      10 kΩ or higher

      Y1-8 (GND2) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE RADIO & DISPLAY RECEIVER ASSEMBLY

    Click here

    NG

    REPLACE NO. 1 NAVIGATION WIRE

    Click here

  4. REPLACE NAVIGATION ECU

    1. Replace the navigation ECU with a known good one.

      Click here

    2. Clear the DTCs.

      Click hereClick here

      Body Electrical > Navigation System > Clear DTCs

    3. Check for DTCs.

      Click hereClick here

      Body Electrical > Navigation System > Trouble Codes

      OK

      No DTCs are output.

    Result

    Proceed to

    OK

    NG
    OK

    END (NAVIGATION ECU IS DEFECTIVE)

    NG

    REPLACE RADIO & DISPLAY RECEIVER ASSEMBLY

    Click here