NAVIGATION SYSTEM, Diagnostic DTC:B1543

DTC Code DTC Name
B1543 Extension Module Disconnected 2

DESCRIPTION

If the radio receiver assembly cannot detect the navigation ECU for a certain period of time (90 seconds) after the engine switch is turned on (ACC) and the radio 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 receiver assembly

  • No. 1 navigation wire

  • Harness or connector

  • Stop and start system*

Tech Tips

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

WIRING DIAGRAM

B0075BWE02

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

  • When replacing the radio receiver assembly or navigation ECU, always replace it with a new one. If a radio 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 receiver assembly or navigation ECU may not operate normally.

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

PROCEDURE


  1. CHECK COMPASS SCREEN


    1. Turn the engine switch on (ACC) and wait for 90 seconds.

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

      Result
      Result Proceed to
      Compass screen is displayed normally A
      Compass 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 compass 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 engine switch off.

    3. Turn the engine switch on (IG) 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. B0075G4C20
      *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
      O162-23 (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
      O162-10 (+B) - Body ground Always

      11 to 14 V*1

      10.5 to 16 V*2

      • *1: w/o Stop and Start System

        *2: w/ Stop and Start System

      Result
      Result Proceed to
      OK A
      NG (w/o Stop and Start System) B
      NG (w/ Stop and Start System) C

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    C

    GO TO STOP AND START SYSTEM Click here

    A

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


    1. B0073XCC36
      *a

      Front view of wire harness connector

      (to Navigation ECU)
      *b

      Front view of wire harness connector

      (to Radio Receiver Assembly)

      Disconnect the o4 radio receiver assembly connector.

    2. Disconnect the o1 navigation ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      o4-4 (USB+) - o1-4 (USB+) Always Below 1 Ω
      o4-5 (USB-) - o1-5 (USB-) Always Below 1 Ω
      o4-6 (USBS) - o1-6 (USBS) 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 engine switch off.

    3. Turn the engine switch on (IG) 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 RECEIVER ASSEMBLY Click here