Radio/Audio System

THEFT DETERRENT

Radio
The Theftlock theft deterrent system is a feature on all base and uplevel radios. There is no need to program a security code into the radio as in past model years. The theft deterrent system now utilizes class 2 serial data to determine if the radio is in the appropriate vehicle. Each time the radio receives the run power mode message, it compares the VIN information it has stored to the VIN information received from the dash integration module (DIM) on the class 2 serial data circuit. If a mis-match occurs, the radio display will indicate to the user the radio is locked. Once this takes place, a DTC will set, the radio will not respond to any button presses and become inoperative. The two scenarios able to cause this condition are:
- A radio is installed from another vehicle
- The DIM is replaced and not properly setup with the correct VIN information for that vehicle

The only way to unlock the radio is by using a scan tool. Always refer to the table to diagnose the Theftlock DTC for further information.

Digital Radio Receiver
The digital radio receiver utilizes class 2 serial data to determine if it is in the appropriate vehicle. Each time the digital radio receiver receives the run power mode message, it compares the VIN information received from the dash integration module (DIM) on the class 2 serial data circuit. If a mis-match occurs, the radio display will indicate to the user the digital radio receiver is locked. The digital radio receiver cannot be unlocked, it must be replaced. The two scenarios able to cause this condition are:
1. A digital radio receiver is installed from another vehicle
2. The DIM is replaced and not properly setup with the correct VIN information for that vehicle

CD Changer
For the uplevel system the CD changer is the main audio gateway. It routes the audio from the source to the audio amplifier.

The radio controls and communicates with the CD changer via the class 2 communication circuit. The CD changer allows for multiple compact discs to be played continuously without having to manually change compact discs. To load multiple CDs, press the LOAD button for more than 3 seconds, then insert the CDs one at a time into the slot below the radio. CDs must be loaded with the label side up. If a disc is loaded label side down, the disc will not play and an error will occur. To eject a single CD press and release the EJECT button. To eject multiple CDs, press and hold the EJECT button for at least 3 seconds. When a CD is loaded in the CD changer the CD symbol will appear on the radio display.