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Toyota Corolla Repair Manual: Sound quality is bad in all modes (volume is too low)

Toyota Corolla Repair Manual / Diagnostics / Audio system / Sound quality is bad in all modes (volume is too low)

Wiring diagram

Inspection procedure

1 Adjust sound quality

  1. Adjust the sound quality.
  1.  Operate the radio receiver assy to adjust the sound quality.

    Standard: malfunction disappear.

2 Compare it with another car of same model

2 Compare it with another car of same model

  1. Compare it with another vehicle of the same model.
  1.  Compare with the vehicle of the same type which does not have a trouble to see if there is any difference in the condition of trouble occurrence.

    Standard: no difference found.

3 Check harness and connector(between radio receiver assy and

3 Check harness and connector(between radio receiver assy and speaker)

4 Inspect front no.1 Speaker assy

4 Inspect front no.1 Speaker assy

  1. Preparation for check
  1.  disconnect the connector of the speaker.
  1.  resistance check
  1.  check the resistance between the terminals of the speaker.

Notice

: the speaker should not be removed for checking.

Standard value: 4 Ω

5 Inspect front no.2 Speaker assy

5 Inspect front no.2 Speaker assy

  1. Check that malfunction disappear when a known good speaker is installed.

    Standard: malfunction disappear.

Hint

: connect the all connectors of speakers.

6 Inspect rear speaker assy

6 Inspect rear speaker assy

  1. Preparation for check
  1.  disconnect the connector of the speaker.
  1.  resistance check
  1.  check the resistance between the terminals of the speaker.

Notice

: the speaker should not be removed for checking.

Standard value: 6 Ω

7 Inspect radio receiver assy(+b, acc, gnd)

7 Inspect radio receiver assy(+b, acc, gnd)

  1. Check that the continuity between terminals at each condition, as shown in the chart.

Standard:

  1. Check that the voltage between terminals at each condition, as shown in the chart.

Standard:

Repair or replace harness or connector

Repair or replace harness or connector

No sound is heard from speaker in all modes
Wiring diagram Inspection procedure 1 Check lcd (liquid crystal display) for lighting Lcd illumination check  turn the ignition switch acc.  Turn the radio receiver assembl ...

Radio broadcast cannot be received (bad reception)
Inspection procedure 1 Check if radio autosearch functions properly Check if the radio autosearch functions properly.  Perform the autosearch of the radio and check that it function ...

Other materials:

Checking the messages
1 Display the Message Inbox screen. 2 Select the desired message from the list. 3 Check that the message is displayed. 1 E-mails: Select Mark Unread or Mark Read to mark mail unread or read on the message inbox screen. This function is available when Update Message Read Status on Phone ...

Warning function
Light in the exterior mirror Prewarning The dimmed light in the exterior mirror indicates when there are vehicles in the blind spot or approaching from behind. Acute warning If the turn signal is switched on while a vehicle is in the critical zone, the steering wheel vibrates briefly and the light ...

Calibrating the compass
The direction display deviates from the true direction determined by the earths magnetic field. The amount of deviation varies according to the geographic position of the vehicle. If you cross over a map boundary shown in illustration, the compass will deviate. To obtain higher precision or p ...

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