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Toyota Corolla Repair Manual: No sound is heard from speaker in all modes

Toyota Corolla Repair Manual / Diagnostics / Audio system / No sound is heard from speaker in all modes

Wiring diagram

Inspection procedure

Inspection procedure

1 Check lcd (liquid crystal display) for lighting

  1. Lcd illumination check
  1.  turn the ignition switch acc.
  2.  Turn the radio receiver assembly on.

    Standard: lcd illumination of the radio receiver assembly light.

2 Control fader and adjust sound balance

2 Control fader and adjust sound balance

  1. Fader and balance adjustment
  1.  operate the radio receiver assembly to adjust the fader and the balance to identify the speaker that does not sound.

3 Inspect front no.1 Speaker assy

3 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

4 Inspect front no.2 Speaker assy

4 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.

5 Inspect rear speaker assy

5 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 w

6 Check harness and connector(between radio receiver assy and

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

Check and replace radio receiver assy

Check and replace radio receiver assy

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

Turning on light switch does not light up night time illumination of radio receiver
Wiring diagram Inspection procedure 1 Inspect radio receiver assy(ill+, ill) Check that the voltage between terminals at each condition, as shown in the chart. Standard: Rep ...

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. ...

Other materials:

Diagnostic trouble code chart
The inspection procedures are shown in the table below. This table allows efficient and accurate troubleshooting using the diagnostic trouble codes displayed in the diagnostic trouble code chart. Proceed with troubleshooting in accordance with the inspection procedures listed in the diagnost ...

Bluetooth
■When using the Bluetooth audio system ●In the following situations, the system may not function. The portable player does not support Bluetooth The cellular phone is located outside the service area The Bluetooth device is switched off The Bluetooth device has a low bat ...

Heater control & accessory assy
Replacement 1. Remove console panel upper 2. Remove instrument cluster finish panel 3. Remove heater control & accessory assy Release the 2 fitting claws and pull out the heater control & accessory assy. Using a screwdriver, open the claw of the cable clamp and dis ...

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