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

Wiring diagram

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

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

1. Preparation for check

1.  disconnect the connector of the speaker.

2.  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

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

1. Preparation for check

1.  disconnect the connector of the speaker.

2.  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 speaker)

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:

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

Standard:

Repair or replace harness or connector