NAVIGATION SYSTEM Radio Broadcast cannot be Received or Poor Reception

PROCEDURE


  1. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. Check the radio automatic station search function.


      1. Check the radio automatic station search function by activating it.

        Result
        Result Proceed to
        Automatic station search function does not stop. A
        Automatic station search function stops on a station. B

    B
    A
  2. CHECK OPTIONAL COMPONENTS


    1. Check if any optional components that may decrease reception capacity, such as sunshade film or a telephone antenna, are installed.

      Result
      Result Proceed to
      Optional components are not installed. A
      Optional components are installed. B

      Note

      Do not remove optional components without the permission of the customer.


    B
    A
  3. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. A01MFLY

      Preparation for check


      1. Disconnect the antenna connector from the radio and display receiver assembly.

    2. Check for noise


      1. Turn the power switch on (ACC) with the radio and display receiver assembly connector connected.

      2. Turn the radio on and tune into AM mode.

      3. Place a screwdriver, thin wire or other metal object on the radio and display receiver assembly antenna jack and check that noise can be heard from the speakers.

        OK
        Noise can be heard from the speakers.
      Result
      Proceed to
      OK
      NG

    NG
    OK
  4. CHECK WINDOW GLASS ANTENNA WIRE


    1. A01MHBNC14
      *a Tester Probe
      *b Antenna Wire
      *c Aluminum Foil

      Check for continuity in the window glass antenna wire.

      Note

      When cleaning the glass, wipe it in the direction of the wire with a soft dry cloth. Take care not to damage the wire. Do not use detergents or glass cleaners with abrasive ingredients. When measuring resistance, wrap a piece of aluminum foil around the tip of each probe and press the foil against the wire with your finger, as shown in the illustration.

      Tech Tips

      Check for continuity at the center of each antenna wire as shown in the illustration.

      OK
      There is continuity in the window glass antenna wire.
      Result
      Proceed to
      OK
      NG

    NG
    OK
  5. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY


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

    2. A01MFT3C28
      *a

      Component without harness connected

      (Radio and Display Receiver Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      RA-5 (ANT+) - Body ground

      Power switch on (ACC)

      Radio switch on and FM or AM selected

      11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG
    OK
  6. REPLACE ANTENNA CORD SUB-ASSEMBLY


    1. Replace the antenna cord sub-assembly with a new or known good one and check if radio broadcasts can be received normally.

      Click here

      OK
      Radio broadcasts can be received normally.
      Result
      Proceed to
      OK
      NG

    OK
    NG
  7. REPLACE NO. 2 ANTENNA CORD SUB-ASSEMBLY


    1. Replace the No. 2 antenna cord sub-assembly with a new or known good one and check if radio broadcasts can be received normally.

      Click here

      OK
      Radio broadcasts can be received normally.
      Result
      Proceed to
      OK
      NG

    OK
    NG
  8. REPLACE NO. 1 AMPLIFIER ANTENNA ASSEMBLY


    1. Replace the No. 1 amplifier antenna assembly with a new or known good one and check if radio broadcasts can be received normally.

      Click here

      OK
      Radio broadcasts can be received normally.
      Result
      Proceed to
      OK
      NG

    OK
    NG