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Toyota Corolla Repair Manual: How to proceed with troubleshooting

Toyota Corolla Repair Manual / Diagnostics / Audio system / How to proceed with troubleshooting

1 Vehicle brought to workshop

2 Customer problem analysis

2 Customer problem analysis

3 Check and clear dtc

3 Check and clear dtc

4 Problem symptom confirmation

4 Problem symptom confirmation

Symptom does not occur (go to

Symptom does not occur (go to step 5)

5 Symptom simulation

6 Dtc check

6 Dtc check

7 Dtc chart

7 Dtc chart

8 Problem symptoms table

8 Problem symptoms table

9 Circuit inspection

9 Circuit inspection

10 Confirmation test

10 Confirmation test

End

End

Customer problem analysis check

Precheck

Description
1. Radio wave band The radio wave bands used in radio broadcasting are as follows: Lf: low frequency mf: medium frequency hf: high frequency vhf: very high frequency 2. Service area ...

Precheck
1. Diagnosis check Starting diagnosis mode (service check mode)  turn off the audio system and turn the ig switch to acc. While pressing the preset switches 1 and 6 at the s ...

Other materials:

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. 2 Compare it with another car of same model Compare it with another vehicle of the same mo ...

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 connector between the airbag sensor assy center and the instrument panel pass ...

Inspection procedure
1 Inspect cruise control actuator assy Inspect the cruise control actuator arm locking operation.  Turn the ignition switch to off.  Disconnect the cruise control actuator assy connector.  Connect the positive (+) lead from the battery to the terminal 3 (l) of crui ...

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