NAVIGATION SYSTEM (for HDD) Radio Broadcast cannot be Received or Poor Reception

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CHECK NAVIGATION 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

   
   
   • AClick here
   • BClick here
2. Click here

   CHECK OPTIONAL COMPONENTS

   
   

   1. Check optional components (sun-shade film, telephone antenna, etc.).

      
      

      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 installed A Optional components are not installed B

         Note:

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

   
   
   • AClick here
   • BClick here
3. Click here

   REMOVE OPTIONAL COMPONENTS AND CHECK AGAIN (SEE NOTICE ABOVE)

4. Click here

   REPLACE NAVIGATION RECEIVER ASSEMBLYClick here

5. Click here

   CHECK NAVIGATION RECEIVER ASSEMBLY

   
   
   1. 

      Preparation for check

      
      

      1. Remove the antenna connector from the navigation receiver assembly.

   2. Check for noise

      
      

      1. Turn the ignition switch ACC with the navigation 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 navigation receiver assembly antenna jack and check that noise can be heard from the speaker.

         OK
         Noise occurs.

   
   
   • OKClick here
   • NGClick here
6. Click here

   CHECK WINDOW GLASS ANTENNA WIRE

   
   
   1. 

      Check for continuity in the antenna.

      Tip:

      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 the negative probe and press the foil against the wire with your finger, as shown in the illustration.

      OK
      There is continuity in the antenna.

   
   
   • AClick here
   • BClick here
7. Click here

   INSPECT NAVIGATION RECEIVER ASSEMBLY

   
   
   1. 

      Disconnect the RA navigation receiver assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition RA-5 (ANT) - Body ground Ignition switch ON Radio switch on 8 V or higher

      Table 1. Text in Illustration

      *a	Component without harness connected (Navigation Receiver Assembly)

   
   
   • OKClick here
   • NGClick here
8. Click here

   CHECK ANTENNA CORD

   
   

   1. Remove the antenna connector of the navigation receiver assembly and antenna.

   2. Measure the resistance between the antenna and navigation receiver assembly to check for an open circuit in the antenna cord.

      Standard Resistance
      Below 1 Ω

   3. Measure the resistance between the antenna cord and body ground to check for a short circuit in the antenna cord.

      Standard Resistance
      10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
9. Click here

   REPLACE AMPLIFIER ANTENNA ASSEMBLY

   
   

   1. Replace the amplifier antenna assembly and check if radio broadcasts can be received normally (Click here).

      OK
      Radio broadcasts can be received.

   
   
   • OKClick here
   • NGClick here
10. Click here

    NORMAL OPERATION

11. Click here

    REPLACE NAVIGATION RECEIVER ASSEMBLYClick here

12. Click here

    REPAIR WINDOW GLASS ANTENNA WIREClick here

13. Click here

    REPLACE NAVIGATION RECEIVER ASSEMBLYClick here

14. Click here

    REPLACE ANTENNA CORDClick here

15. Click here

    REPLACE NAVIGATION RECEIVER ASSEMBLYClick here