Noise Diagnosis - Corrective Action

^ Use the proper tools for diagnostics and repairs.
^ Follow ESD guidelines.
^ Use the following available noise suppression devices:
- 220 mF (50 V) capacitor GM P/N 1227895
- 0.47 mF capacitor GM P/N 1227894
- Fuse block capacitor GM P/N 469328
- Feed through capacitor GM P/N 477371
- Filter package GM P/N 1224205
- Turn signal suppression GM P/N 3861565
- Fuel pump suppressor GM P/N 25027405
- 21 in braided ground strap GM P/N 8910791
- 19 in braided ground strap GM P/N 6286800
- 10.5 in braided ground strap GM P/N 6287160
- 8.5 in braided ground strap GM P/N 12091511
^ Utilize the test tape/CD diagnostic kit
GM P/N J 39916-A Speaker Noise - General in order to optimize proper audio diagnostics.
^ If the condition requires service of the radio at a service center, describe the symptoms on the warranty form accurately. Along with the warranty form, send a copy of the service writer check list with the unit.
^ Do not leave a CD or a tape in the car. Extreme heat may cause permanent damage.
^ Cassette tapes may be damaged if not stored in the case. The vibration in the vehicle may cause the tape to unwind inside the cartridge.
^ Inspect all of the connectors and the wiring to the speakers before you remove the speakers. Examine the connectors for bent or loose pins. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. Diagnostic Aids