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

Tech Tips


  • 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

A01KBPBE02

CAUTION / NOTICE / HINT

Note

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

Click here

PROCEDURE


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


    1. A01KBWXC02
      *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 here


      Body Electrical > Navigation System > Clear DTCs

    3. Check for DTCs.

      Click 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 ECU Click 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 AND 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 here


      Body Electrical > Navigation System > Clear DTCs

    3. Check for DTCs.

      Click 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 AND DISPLAY RECEIVER ASSEMBLY Click here