NAVIGATION SYSTEM Radio Broadcast cannot be Received or Poor Reception

WIRING DIAGRAM

B004VEGE01

CAUTION / NOTICE / HINT

Note

When replacing the radio receiver assembly, always replace it with a new one.

If a radio receiver assembly which was installed to another vehicle is used, the following may occur:


  • A communication malfunction DTC may be stored.

  • The radio receiver assembly may not operate normally.

Tech Tips

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

PROCEDURE


  1. CHECK RADIO RECEIVER ASSEMBLY


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

      OK
      Automatic station search function stops on a station.
      Result
      Proceed to
      OK
      NG

    OK
    NG
  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.

      OK
      Optional components are not installed.

      Note

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

      Result
      Proceed to
      OK
      NG

    NG
    OK
  3. CHECK RADIO RECEIVER ASSEMBLY


    1. B004TWN

      Preparation for check


      1. Disconnect the RA radio receiver assembly connector.

    2. Check for noise


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

      2. Turn the radio receiver assembly on and enter AM mode.

      3. Place a screwdriver, thin wire or other metal object on the radio 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 BACK WINDOW GLASS (WINDOW GLASS ANTENNA WIRE)


    1. B004V4KC29
      *a Tester Probe
      *b Antenna Wire
      *c Tin Foil

      Check for continuity in the window glass antenna wire.

      Tech Tips

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

      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 tin foil around the tip of each probe and press the foil against the wire with your finger 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 RECEIVER ASSEMBLY


    1. B004W2LE31

      Disconnect the RA radio receiver assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      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. CHECK NO. 4 ANTENNA CORD SUB-ASSEMBLY


    1. B004SYKC01
      *a

      Front view of wire harness connector

      (to Radio Receiver Assembly)

      *b

      Front view of wire harness connector

      (to Antenna Cord Sub-assembly [floor])

      Disconnect the antenna connector from the radio receiver assembly.

    2. Disconnect the antenna connector from the antenna cord sub-assembly (floor).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      RA-3 (MAIN) - D-3 Always Below 1 Ω
      RA-4 - D-3a Always Below 1 Ω
      RA-1 (SUB) - D-4 Always Below 1 Ω
      RA-2 - D-4a Always Below 1 Ω
      RA-5 (ANT+) - D-1 Always Below 1 Ω
      RA-3 (MAIN) - Body ground Always 10 kΩ or higher
      RA-4 - Body ground Always 10 kΩ or higher
      RA-1 (SUB) - Body ground Always 10 kΩ or higher
      RA-2 - Body ground Always 10 kΩ or higher
      RA-5 (ANT+) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  7. CHECK ANTENNA CORD SUB-ASSEMBLY (FLOOR)


    1. B004XEVC02
      *a

      Front view of wire harness connector

      (to No. 4 antenna cord sub-assembly)

      *b

      Front view of wire harness connector

      (to No. 1 amplifier antenna assembly)

      *c

      Front view of wire harness connector

      (to No. 2 amplifier antenna assembly)

      Disconnect the antenna connector from the No. 4 antenna cord sub-assembly.

    2. Disconnect the antenna connector from the No. 1 amplifier antenna assembly.

    3. Disconnect the antenna connector from the No. 2 amplifier antenna assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D-1 - C-1 Always Below 1 Ω
      D-1 - G-1 Always Below 1 Ω
      D-4 - C-2 Always Below 1 Ω
      D-4a - C-2a Always Below 1 Ω
      D-3 - G-2 Always Below 1 Ω
      D-3a - G-2a Always Below 1 Ω
      D-1 - Body ground Always 10 kΩ or higher
      D-4 - Body ground Always 10 kΩ or higher
      D-4a - Body ground Always 10 kΩ or higher
      D-3 - Body ground Always 10 kΩ or higher
      D-3a - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  8. CHECK NO. 2 ANTENNA CORD SUB-ASSEMBLY


    1. B004SR2C03
      *a

      Front view of wire harness connector

      (to No. 1 Amplifier Antenna Assembly)

      *b

      Front view of wire harness connector

      (to Back Window Glass [Window Glass Antenna Wire])

      Disconnect the antenna connector from the No. 1 amplifier antenna assembly.

    2. Disconnect the antenna connector from the back window glass (window glass antenna wire).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B-2 - A-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG
    OK
  9. CHECK NO. 5 ANTENNA CORD SUB-ASSEMBLY


    1. B004WTDC02
      *a

      Front view of wire harness connector

      (to No. 2 Amplifier Antenna Assembly)

      *b

      Front view of wire harness connector

      (to Back Window Glass [Window Glass Antenna Wire])

      Disconnect the antenna connector from the No. 2 amplifier antenna assembly.

    2. Disconnect the antenna connector from the back window glass (window glass antenna wire).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F-2 - E-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG
    OK
  10. CHECK NO. 1 AMPLIFIER ANTENNA ASSEMBLY


    1. Replace the No. 1 amplifier antenna assembly with a new or known good one.

      Click here

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

    OK
    NG
  11. CHECK NO. 2 AMPLIFIER ANTENNA ASSEMBLY


    1. Replace the No. 2 amplifier antenna assembly with a new or known good one.

      Click here

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

    OK
    NG