NAVIGATION SYSTEM (for Navigation Receiver Type) Radio Broadcast cannot be Received or Poor Reception

INSPECTION PROCEDURE

PROCEDURE

1. CHECK NAVIGATION ECU SUB-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

   REPLACE NAVIGATION ECU SUB-ASSEMBLY Click here

   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

   REMOVE OPTIONAL COMPONENTS AND CHECK AGAIN (SEE NOTICE ABOVE)

   A

3. CHECK RADIO ANTENNA

   
   

   1. Preparation for check

      
      

      1. Remove the roof antenna pole sub-assembly from the amplifier antenna assembly (for Roof).

   2. Check for noise

      
      

      1. Turn the power switch on (ACC) with the navigation ECU sub-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 amplifier antenna threaded installation portion for the roof antenna pole sub-assembly and check that noise can be heard from the speakers.

         Result
         Result Proceed to Noise does not occur A Noise occurs B

   
   

   B

   REPLACE NAVIGATION ECU SUB-ASSEMBLY Click here

   A

4. CHECK NAVIGATION ECU SUB-ASSEMBLY

   
   

   1. 

      Preparation for check

      
      

      1. Remove the antenna connector from the navigation ECU sub-assembly.

   2. Check for noise

      
      

      1. Turn the power switch on (ACC) with the navigation ECU sub-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 ECU sub-assembly antenna jack and check that noise can be heard from the speakers.

         OK
         Noise can be heard from the speakers.

   
   

   NG

   REPLACE NAVIGATION ECU SUB-ASSEMBLY Click here

   OK

5. INSPECT NAVIGATION ECU SUB-ASSEMBLY

   
   

   1. Disconnect the navigation ECU sub-assembly connector.

   2. 

      Text in Illustration

      *a	Component without harness connected (Navigation ECU Sub-assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition RA-5 (ANT+) - Body ground Power switch on (ACC) Radio switch on and AM or FM selected 11 to 14 V

   
   

   NG

   REPLACE NAVIGATION ECU SUB-ASSEMBLY Click here

   OK

6. REPLACE NO. 2 ANTENNA CORD SUB-ASSEMBLY

   
   

   1. Replace the No. 2 antenna cord sub-assembly and check if radio broadcasts can be received normally Click here.

      OK
      Radio broadcasts can be received normally.

   
   

   NG

   INSPECT NO. 4 ANTENNA CORD SUB-ASSEMBLY Click here

   OK

   NORMAL OPERATION

7. INSPECT NO. 4 ANTENNA CORD SUB-ASSEMBLY

   
   

   1. Disconnect the No. 4 antenna cord sub-assembly.

   2. Measure the resistance of the No. 4 antenna cord sub-assembly to check for an open circuit in the No. 4 antenna cord sub-assembly.

      Standard Resistance
      Below 1 Ω

   3. Measure the resistance between the No. 4 antenna cord sub-assembly and body ground to check for a short circuit in the No. 4 antenna cord sub-assembly.

      Standard Resistance
      10 kΩ or higher

   
   

   NG

   REPLACE NO. 4 ANTENNA CORD SUB-ASSEMBLY Click here

   OK

8. INSPECT NO. 5 ANTENNA CORD SUB-ASSEMBLY

   
   

   1. Disconnect the No. 5 antenna cord sub-assembly.

   2. Measure the resistance of the No. 5 antenna cord sub-assembly to check for an open circuit in the No. 5 antenna cord sub-assembly.

      Standard Resistance
      Below 1 Ω

   3. Measure the resistance between the No. 5 antenna cord sub-assembly and body ground to check for a short circuit in the No. 5 antenna cord sub-assembly.

      Standard Resistance
      10 kΩ or higher

   
   

   NG

   REPLACE NO. 5 ANTENNA CORD SUB-ASSEMBLY Click here

   OK

9. CHECK ROOF ANTENNA POLE SUB-ASSEMBLY

   
   

   1. Check that the roof antenna pole sub-assembly is securely installed Click here.

      OK
      The roof antenna pole sub-assembly is installed properly.

   
   

   NG

   CHECK AND REPLACE ROOF ANTENNA POLE SUB-ASSEMBLY Click here

   OK

10. REPLACE AMPLIFIER ANTENNA ASSEMBLY (for Roof)

    
    

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

       OK
       Radio broadcasts can be received normally.

    
    

    NG

    REPLACE NAVIGATION ECU SUB-ASSEMBLY Click here

    OK

    NORMAL OPERATION