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 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 Code DTC Detection Condition Trouble Area
B1532

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

  • Harness or connector

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

A01IQC6E12

INSPECTION PROCEDURE

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 HARNESS AND CONNECTOR (NAVIGATION ECU POWER SOURCE)


    1. A01IQ5LE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Navigation ECU)

      Disconnect the z26 navigation ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z26-2 (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
      z26-1 (B+) - z26-2 (GND) Always 11 to 14 V
      z26-3 (ACC) - z26-2 (GND) Ignition switch ACC 11 to 14 V

    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).

    2. Clear the DTCs Click here.

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

      OK
      No DTCs are output.

    NG

    REPLACE NAVIGATION ECU Click here

    OK

    END (LVDS COMMUNICATION LINE IS DEFECTIVE)

  3. REPLACE NAVIGATION ECU


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

    2. Clear the DTCs Click here.

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

      OK
      No DTCs are output.

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

    END (NAVIGATION ECU IS DEFECTIVE)

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


    1. Disconnect the z27 radio and display receiver assembly connector.

    2. Disconnect the z26 navigation ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z27-4 (+B2) - z26-1 (B+) Always Below 1 Ω
      z27-3 (ACC2) - z26-3 (ACC) Always Below 1 Ω
      z27-8 (GND2) - z26-2 (GND) Always Below 1 Ω
      z27-4 (+B2) - Body ground Always 10 kΩ or higher
      z27-3 (ACC2) - Body ground Always 10 kΩ or higher
      z27-8 (GND2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here