For 1990-2009 cars

# Info - Changes to the U1C Radio On-Board Diagnostic Modes and CD Load Operation

Subject: | Changes to the U1C Radio On-board Diagnostic Modes and CD Load Operation

Models: | 2003 Saturn ION Vehicles Built after VIN Breakpoint 3Z201656

| 2003 Saturn VUE Vehicles Built after VIN Breakpoint 3S905693

| 2004 Saturn ION, VUE, and L- Series Vehicles

| The following models are affected if equipped with P/N 22722705, 22722992, or remanufactured P/N 22711669:

| 2000-2002 Saturn S-Series Vehicles

| 2000-2003 Saturn L-Series Vehicles

| 2002-2003 Saturn VUE Vehicles Built Up To and Including VIN Breakpoint 3S905693

| 2003 Saturn ION Vehicles Built Up To and Including VIN Breakpoint 3Z201656

Attention: | Technician, Parts Manager

### Purpose

The purpose of this bulletin is to provide information on the changes to the U1C AM/FM Stereo CD radio on-board diagnostic modes and CD load operation. The U1C radio contains a menu of options used for diagnosing audio system concerns. This menu is known as the On Board Diagnostic Mode. The following are changes to the diagnostic menu:

• | Removal of (T-01) Diagnostic Trouble Code Mode

• | Removal of (T-04) Key Test Mode

• | Removal of (T-05) Antenna Signal Strength Meter Mode

• | Removal of (T-06) Clear Diagnostic Trouble Code Mode

• | Addition of (T-07) Software ID Mode

Important: The Service Manual may refer to a diagnostic mode that may no longer be available on this radio.

The CD button can no longer be used to reload the CD. The CD can either be physically reinserted into the radio or the CD will reload automatically after 15 seconds.

### Parts Information

Part Number | Description
--- | ---
22711669 | RADIO ASM -- AM/FM STEREO & CLK & AUDIO DISC PLYR (REMAN)
22722705 | RADIO ASM -- AM/FM STEREO & CLK & AUDIO DISC PLYR
22722992 | RADIO ASM -- AM/FM STEREO & CLK & AUDIO DISC PLYR