Corrective Action
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Savana Special, 2003 GMC Savana Camper Special, 2003 GMC Savana, 2003 Chevrolet RV Cutaway, and 2003 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect the ground integrity of the component or system causing the noise.
- Malfunctioning and marginal components such as relays and solenoids may cause noise and/or poor reception.
- Always use a braided ground strap when applying additional grounds and keep the ground strap as short as possible.
- If the noise source is found to be coming from the vehicle harness:
- Route the antenna cable separately from the wire harness that is emitting the noise.
- Use aluminum or nickel tape in order to shield the antenna cable. Try variations of the following repairs:
- Try adding only aluminum or nickel tape before adding a ground strap to the tape.
- Wrap a ground strap 360 degrees around the tape, securing the other end of the strap to chassis ground.
Important: When installing suppression devices, signal wires such as sensor and communication circuits should not be suppressed. Battery and ignition voltage circuits are the best choices for suppressing.
- Capacitors work best on switch pops and low frequency noise.
- Filters work best on high frequency whines and static.
- After adding any suppression device, inspect all of the vehicle systems including those not related to the audio system, for proper operation and function.
- Whenever possible, make a test harness that includes filters or capacitors. Always inspect the effectiveness and operation before permanent installation.
- If an audible pop is caused due to operating a switch, perform the following repairs as necessary:
- Add a capacitor across the contacts of the switch.
- Add a capacitor from the battery positive voltage (B+) side of the switch to chassis ground.
- Add a capacitor from the ground side of the switch to chassis ground.
- Use the following available noise suppression devices:
- 220 micro farad (50 V) capacitor GM P/N 12278950 - Works well for ignition system related noise.
- 0.47 micro farad capacitor GM P/N 1227894 - Works well for switches and relays.
- Feed through capacitor GM P/N 477371 - Works well for high current situations.
- Filter package GM P/N 1224205 - Works well for low current situations.
- Fuel pump suppressor GM P/N 25027405
- 21 inch braided ground strap GM P/N 8910791
- 19 inch braided ground strap GM P/N 6286800
- 10.5 inch braided ground strap GM P/N 6287160
- 8.5 inch braided ground strap GM P/N 12091511