For 1990-2009 cars

# Popping/Crackling Noise or Distorted Sound from Speakers at Low Volume When a Compact Disc (CD) is Played (Replace RPO U1C CD Player/Radio with New Design CD Player/Radio)

Subject: | Popping/Crackling Noise or Distorted Sound from Speakers at Low Volume When a Compact Disc (CD) Is Played (Replace RPO U1C CD Player/Radio with New Design CD Player/Radio)

Models: | 2004 Saturn ION Vehicles with Single-Disc CD Player (RPO U1C)

| 2004 Saturn VUE Vehicles with Single-Disc CD Player (RPO U1C)

| (This bulletin also applies to any Saturn vehicle with service CD player, P/N 22711669, installed)

Attention: | Fixed Operations Manager and Technician

### Condition

Some customers may comment on a popping or crackling noise or distorted sound coming from the speakers at low volume, which only occurs when a CD is being played. The noise is most noticeable when bass is predominant in the music being played. This condition only affects vehicles with the single-disc CD/radio unit (RPO U1C) illustrated below.

### Cause

The low audio frequency (below 20 Hz) may be over-amplified, which may cause the speaker to sound distorted (overdriven).

### Correction

The circuitry from the CD player to the internal radio amplifier has been modified to eliminate the popping/crackling noise and distorted sound condition. If vehicle is affected by this condition, install new single-disc CD/radio unit, P/N 21997420.

### Service Procedure

Important: If a popping noise is also present when only listening to FM or AM radio, then further diagnosis will be needed. Refer to diagnostic procedures in the appropriate Saturn Service Manual or SI. This bulletin only covers the issue of noise and sound distortion when a CD is being played.

1. Remove single-disc CD/radio unit using removal procedures in the appropriate Saturn Service Manual or SI.
2. If installing a single-disc CD/radio unit in a 2000-2003 model year vehicle, then proceed to Step 3. If not, then proceed to Step 6.
3. Remove jumper harness from the back of the old single-disc CD/radio unit and retain harness for use with the new service single-disc CD/radio unit.
4. Remove and discard the jumper harness from the new service part.
5. Install jumper harness that was removed from old single-disc CD/radio unit onto new service single-disc CD/radio unit as shown in illustration.
6. Install new single-disc CD/radio unit, P/N 21997420, using installation procedures in the appropriate Saturn Service Manual or SI.

### Parts Information

Part Number | Description
--- | ---
21997420* | Radio Asm - AM/FM Stereo & Clock & Audio Disc Player

* Canadian Retailers should obtain parts from an ACDelco Radio Centre.

### Claim Information

To receive credit for this repair during the warranty coverage period, submit a claim through the Saturn Dealer System for R0760 (Radio Receiver - R & R or Replace).