NAVIGATION SYSTEM, 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 via 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 any of the following conditions is met:


  • Video signal (digital) is lost.

  • Navigation ECU is/was not connected while the power switch is/was on (ACC) or on (IG).

  • 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

  • Harness and connector

Tech Tips


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

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

WIRING DIAGRAM

A01KTRUE09
*a Radio and Display Receiver Assembly
*b Navigation ECU
*c LVDS Communication Line

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (NAVIGATION ECU POWER SOURCE)


    1. Disconnect the V5 navigation ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V5-2 (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
      V5-1 (+B1) - V5-2 (GND) Power switch off 11 to 14 V
      V5-3 (ACC) - V5-2 (GND) Power switch on (ACC) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU) Click here

    OK

  2. REPLACE HARNESS AND CONNECTOR (LVDS COMMUNICATION LINE)


    1. Replace the harness and connector (LVDS communication line) with a new or known good one.

    2. Clear the DTCs.

      Click here


      Body Electrical > Navigation System > Clear DTCs

    3. Recheck for DTCs and check that no DTCs are output.


      Body Electrical > Navigation System > Trouble Codes
      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

  3. REPLACE NAVIGATION ECU


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

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Navigation System > Clear DTCs

    3. Recheck for DTCs and check that no DTCs are output.


      Body Electrical > Navigation System > Trouble Codes
      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

  4. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU)


    1. Disconnect the V6 radio and display receiver assembly connector.

    2. Disconnect the V5 navigation ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V6-4 (+B2) - V5-1 (+B1) Always Below 1 Ω
      V6-3 (ACC2) - V5-3 (ACC) Always Below 1 Ω
      V6-8 (GND2) - V5-2 (GND) Always Below 1 Ω
      V6-4 (+B2) - Body ground Always 10 kΩ or higher
      V6-3 (ACC2) - Body ground Always 10 kΩ or higher
      V6-8 (GND2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR