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
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

E276665E33

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 HARNESS AND CONNECTOR (NAVIGATION ECU POWER SOURCE)

    1. U124114E02

      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
      Table 1. Text in Illustration

      *a

      Front view of wire harness connector

      (to Navigation ECU)

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

  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.

    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.

    END (NAVIGATION ECU IS DEFECTIVE)

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    (Click here)

  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

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR