Audio And Visual System (W/ Multi-Display With Dvd Player) Radio Broadcast Cannot Be Received Or Poor Reception

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK NAVIGATION RECEIVER ASSEMBLY

CHECK OPTIONAL COMPONENTS

CHECK NAVIGATION RECEIVER ASSEMBLY

CHECK WINDOW GLASS ANTENNA WIRE

CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - AMPLIFIER ANTENNA ASSEMBLY)

INSPECT NAVIGATION RECEIVER ASSEMBLY

REPLACE ANTENNA CORD SUB-ASSEMBLY

REPLACE AMPLIFIER ANTENNA ASSEMBLY

WIRING DIAGRAM

INSPECTION PROCEDURE

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 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

      NOTICE:

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

1. Preparation for check
   

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

2. Check for noise
   

   1. Turn the ignition switch to 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 speakers.
      

      OK:

      Noise occurs.
      

1. Check for continuity of the antenna.
   

   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 antenna.
   

   Text in Illustration

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

1. Disconnect the E1 navigation receiver assembly connector.
   

2. Disconnect the E3 amplifier antenna assembly connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E1-8 (ANT) - E3-1 (B)	Always	Below 1 Ω
   E3-1 (B) - Body ground	Always	10 kΩ or higher

1. Reconnect the E3 navigation receiver assembly connector.
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   E3-1 (B) - Body ground	Ignition switch ON Radio switch on	11 to 14 V

   Text in Illustration

   *a	Front view of wire harness connector (to Amplifier Antenna 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.
   

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.