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Toyota Corolla Repair Manual: Radio broadcast cannot be received (bad reception)

Toyota Corolla Repair Manual / Diagnostics / Audio system / Radio broadcast cannot be received (bad reception)

Inspection procedure

1 Check if radio autosearch functions properly

  1. Check if the radio autosearch functions properly.
  1.  Perform the autosearch of the radio and check that it functions normally.

    Standard: the radio autosearch functions properly.

2 Check optional component

2 Check optional component

  1. Check optional component (sun shade film, telephone antenna etc.).
  1.  Check whether or not any optional component is installed, such as the sunshade film and the telephone antenna, is installed.

    Standard: optional component is installed.

3 Check antenna for noise production

3 Check antenna for noise production

  1. Noise check with antenna
  1.  with the ignition switch in acc, turn on the radio and choose the am mode.
  2.  Place a tip of a screwdriver or the antenna of the antenna assembly w/ holder and check that the noise heard from the speaker.

    Standard: noise occurs.

4 Inspect radio receiver assy(antenna)

4 Inspect radio receiver assy(antenna)

  1. Preparation for check
  1.  remove the antenna plug of the radio receiver assembly.
  1.  noise check
  1.  with the radio receiver assembly connector connected, turn the ignition switch to acc.
  2. Turn on the radio and choose the am mode.
  3.  Place a flathead screwdriver or a metal such as a thin wire on the antenna jack of the radio receiver assembly and check that the noise heard from the speaker.

    Standard: noise occurs.

Replace amplifier antenna assy

Replace amplifier antenna assy

Sound quality is bad in all modes (volume is too low)
Wiring diagram Inspection procedure 1 Adjust sound quality Adjust the sound quality.  Operate the radio receiver assy to adjust the sound quality. Standard: malfunction disappear. ...

Cassette tape cannot be inserted or played
Wiring diagram Inspection procedure 1 Check for any foreign object Check for any foreign object.  Check that no foreign object or defect is detected in the cassette tape player of ...

Other materials:

Other functions
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Circuit description
The airbag sensor assy center consists of a airbag sensor assy center, safing sensor, drive circuit, diagnosis circuit and ignition control, etc. It receives signals from the airbag sensor, judges whether or not the srs must be activated, and detects diagnosis system malfunction. Dtc b11 ...

Circuit description
The crankshaft position sensor (ne signal) consists of a magnet, iron core and pickup coil. The ne signal plate (crankshaft position sensor plate) has 34 teeth and is installed on the crankshaft. The ne signal sensor generates 34 signals for each engine revolution. This sensor monitors a p ...

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