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

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK RADIO RECEIVER ASSEMBLY

CHECK OPTIONAL COMPONENTS

CONFIRM MODEL

CHECK RADIO RECEIVER ASSEMBLY

CHECK WINDOW GLASS ANTENNA WIRE

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

INSPECT RADIO RECEIVER ASSEMBLY

CHECK RADIO RECEIVER ASSEMBLY

CHECK WINDOW GLASS ANTENNA WIRE

INSPECT RADIO RECEIVER ASSEMBLY

CHECK ANTENNA CORD

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:

      
      

      Condition	Proceed to
      Automatic station search function stops on a station	A
      Automatic station search function does not stop	B

1. Check optional components (sunshade 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:

      
      

      Condition	Proceed to
      Optional components are installed	A
      Optional components are not installed	B

      NOTICE:

      Do not remove any optional components installed by the customer without his or her consent.

Result:

Condition	Proceed to
for 4 speakers	A
for 6 speakers (w/o USB audio system)
for 6 speakers (w/ USB audio system)	B

1. Preparation for check
   

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

2. Check for noise
   

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

      OK:

      Noise can be heard from the speaker.
      

1. Check for continuity in 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 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.
   

1. Disconnect the E1 radio 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
   E1-8 (ANT) - Body ground	Always	10 kΩ or higher

1. Reconnect the radio 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 ACC Radio switch on	11 to 14 V

   1. Proceed to the next step based on the inspection result.
      

      Result:

      Result	Proceed to
      NG	A
      OK	B

      Text in Illustration

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

1. Preparation for check
   

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

2. Check for noise
   

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

      OK:

      Noise can be heard from the speaker.
      

1. Check for continuity in 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 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.
   

1. Disconnect the RA1 radio receiver assembly connector.
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   RA1-5 (ANT+) - Body ground	Ignition switch ACC Radio switch on	8 V or higher

   Text in Illustration

   *a	Component without harness connected (Radio Receiver Assembly)

1. Remove the antenna plug of the radio receiver assembly and antenna.
   

2. Measure the resistance between the antenna and radio 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
   

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.