Unlocking a GM factory radio after a swap can be a frustrating experience. This guide provides a detailed walkthrough of how to successfully unlock a GM radio using an Autel IM608 diagnostic scanner, a process that proved successful where a Snap-on scanner failed. This method bypasses the need for a factory programming method like SPS, saving time and potentially money.
Identifying Your GM Vehicle and Air Pump Presence
Begin by connecting the Autel IM608 to the vehicle’s OBD-II port. Navigate to:
Diagnostics > GM
The system will prompt you to indicate whether the vehicle has an air pump. To determine this, open the hood and inspect the exhaust manifold. Look for a divert valve, which indicates the presence of an air pump.
Navigating to the Radio Setup Function
After correctly identifying the air pump presence, do not follow the path to Hot functions > TEC Learn > Crankshaft Position (CKP) variation learn. This is not the correct procedure for unlocking the radio. Instead, return to the main menu and follow this navigation path:
Diagnosis > Control unit > Radio > Special function
You’ll encounter two options: “Set options” and “Radio setup.” Choose “Radio setup” to proceed with the unlock process.
Configuring the Radio Setup
The Autel IM608 will then ask if you are setting up a new or existing radio. Select “Yes” to indicate a new radio installation.
The next prompt inquires about an “up-level” radio. This typically refers to a radio with features like speed-sensitive volume control. If your radio includes an “SCV” option (likely Speed Control Volume), select “Yes.”
Subsequent prompts will ask about specific RPO (Regular Production Option) codes, such as PRO or UL2. If you are unsure about these codes, it is recommended to select “No.” In this specific instance, selecting “Yes” for these codes resulted in failure. The radio successfully unlocked only after choosing “No” for these prompts.
Successful Unlock and Verification
After navigating the prompts correctly, the radio should unlock. The screen will display a confirmation message.
To verify the unlock, disconnect and reconnect all the radio cables. Power on the vehicle and confirm the radio functions correctly without displaying any error messages.
Conclusion
The Autel IM608 provides a straightforward solution for unlocking GM factory radios, successfully bypassing the Theftlock system. By following this guide, technicians can avoid potential complications and ensure a successful radio installation. This method proved effective where other scan tools, like the Snap-on, lacked the necessary functionality. While the “Set Options” menu offers adjustments for chime volume and levels, this guide focused on the successful radio unlock process using the “Radio Setup” function within the Autel IM608. This underscores the value of the Autel IM608 as a comprehensive diagnostic tool for automotive professionals.
