Navigation System Radio Broadcast Cannot Be Received Or Poor Reception

INSPECTION PROCEDURE

CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

CHECK OPTIONAL COMPONENTS

CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

CHECK WINDOW GLASS ANTENNA WIRE

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

REPLACE ANTENNA CORD SUB-ASSEMBLY

REPLACE AMPLIFIER ANTENNA ASSEMBLY

INSPECTION PROCEDURE

NOTICE:

After replacing the radio and display receiver assembly of vehicles subscribed to pay-type satellite radio broadcasts, XM radio ID registration is necessary (w/ SDARS System).

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

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

   NOTICE:

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

1. Preparation for check
   

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

2. Check for noise
   

   1. Turn the ignition switch to 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.
      

1. Check for continuity in the window glass antenna wire.
   

   HINT:

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

   NOTICE:

   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.
   

   Text in Illustration

   *a	Tester Probe
   *b	Antenna Wire
   *c	Tin Foil

1. Disconnect the radio and display 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 ACC Radio switch on and FM or AM selected	11 to 14 V

   Text in Illustration

   *a	Component without harness connected (Radio and Display Receiver Assembly)

1. Replace the antenna cord sub-assembly and check if radio broadcasts can be received normally (COROLLA_ZRE142 RM000002XBA01DX.html).
   

   OK:

   Radio broadcasts can be received normally.
   

1. Replace the amplifier antenna assembly and check if radio broadcasts can be received normally (COROLLA_ZRE142 RM000002XB101LX.html).
   

   OK:

   Radio broadcasts can be received normally.