NAVIGATION SYSTEM, Diagnostic DTC:B1543

DTC Code DTC Name
B1543 Extension Module Disconnected 2

DESCRIPTION

If the radio and display receiver assembly cannot detect the navigation ECU for a certain period of time (90 seconds) after the ignition switch is turned to ACC and the radio and display receiver assembly confirms that the information is missing by checking past navigation ECU recognition information (registered information), this DTC will be stored.

Tech Tips

The Navigation system uses USB communication between devices. If an open, short, short to +B or short to ground occurs in the USB circuit, communication is interrupted and the Navigation system will not operate normally.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1543 Extension Module Disconnected 2 Navigation ECU disconnected

  • Navigation ECU

  • Radio and display receiver assembly

  • No. 1 navigation wire

  • Harness or connector

Tech Tips

This DTC may be stored due to environmental reasons such as electrical noise or interference.

WIRING DIAGRAM

B006WUWE01

CAUTION / NOTICE / HINT

Note


  • Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • When replacing the radio and display receiver assembly or navigation ECU, always replace it with a new one. If a radio and display receiver assembly or navigation ECU which was installed to another vehicle is used, the following may occur:


    • A communication malfunction DTC may be stored.

    • The radio and display receiver assembly or navigation ECU may not operate normally.

PROCEDURE


  1. CHECK MAP SCREEN


    1. Turn the ignition switch to ACC and wait for 90 seconds.

    2. Press the "MAP" switch and check that the map screen is displayed normally.

      Result
      Result Proceed to
      Map screen is displayed normally A
      Map screen is not displayed normally B

      Tech Tips


      • This DTC may be stored due to environmental reasons such as electrical noise or interference.

      • Clear past DTCs when the map screen is displayed normally. (Codes stored due to past environmental factors)


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  2. CHECK DTC


    1. Clear the DTCs.


      Body Electrical > Navigation System > Clear DTCs

    2. Turn the ignition switch off.

    3. Turn the ignition switch to ON and wait for 90 seconds.

    4. 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

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - BATTERY AND BODY GROUND)


    1. B00715GC04
      *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
      K17-23 (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
      K17-10 (+B) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. B006X3VC02
      *a

      Front view of wire harness connector

      (to Radio and Display Receiver Assembly)
      *b

      Front view of wire harness connector

      (to Navigation ECU)

      Disconnect the r1 navigation ECU connector.

    2. Disconnect the r3 radio and display receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      r1-4 (US4+) - r3-1 (US4+) Always Below 1 Ω
      r1-5 (US4-) - r3-2 (US4-) Always Below 1 Ω
      r1-6 (UGD4) - r3-3 (UGD4) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 NAVIGATION WIRE Click here

    OK

  5. REPLACE NAVIGATION ECU


    1. Replace the navigation ECU with a new one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK DTC


    1. Clear the DTCs.


      Body Electrical > Navigation System > Clear DTCs

    2. Turn the ignition switch off.

    3. Turn the ignition switch to ON and wait for 90 seconds.

    4. 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 (NAVIGATION ECU IS DEFECTIVE)

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here