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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:

Starting the engine
1 Continuously variable transmission: Ensure that the shift lever is in P and depress the brake pedal. Manual transmission: Shift the shift lever to N and depress the clutch pedal. 2 Touch the Toyota emblem side of the electronic key to the engine switch. When the electronic key is detected, a ...

Registering a new contact to the contact list
New contact data can be registered. Up to 4 numbers per person can be registered. For PBAP compatible Bluetooth phones, this function is available when Automatic Contact/History Transfer is set to off. 1 Select New Contact. 2 Enter the name and select OK. 3 Enter the phone number and s ...

Inspection procedure
1 Check p squib circuit(airbag sensor assy center instrument panel passenger airbag assy) Disconnect the negative () terminal cable from the battery, and wait at least for 90 seconds.  disconnect the connectors between the airbag sensor assy center and the instrument panel pas ...

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