<h1>1998 GMC Sonoma – Key Fob Programming Instructions</h1> <p><font size="3">If you need to program a new or replacement keyless remote fob for your 1998 Sonoma, this process can be completed manually using the vehicle’s onboard controls. Be sure to have all remotes ready, as they must be programmed during the same session. </font></p> <p><font size="3"><b>Step-by-Step Remote Programming Procedure</b> </font></p> <ul> <li><font size="3">Step 1: Prepare the Vehicle Ensure all vehicle doors are completely closed to prevent interference during programming. </font></li> <li><font size="3">Step 2: Insert the Ignition Key Insert your key into the ignition cylinder, but do not turn it yet. </font></li> <li><font size="3">Step 3: Hold the Unlock Button On the driver’s side door panel, press and hold the power unlock button. Continue holding this button until instructed to release in a later step. </font></li> <li><font size="3">Step 4: Cycle the Ignition While continuing to hold the unlock button: Turn the key to the ON position (without starting the engine). Then turn the key back to the OFF position. Again, turn it to the ON position. Then return it to the OFF position. </font></li> <li><font size="3">Step 5: Enter Programming Mode Now release the power unlock button. If done correctly, the vehicle will respond by locking and unlocking the doors automatically—this confirms it has entered fob programming mode. If you don’t see this response, restart from Step 1.</font></li> <li><font size="3"> Step 6: Program the First Remote Press and hold the LOCK and UNLOCK buttons on the first remote at the same time. Hold for up to 30 seconds until the vehicle locks and unlocks the doors again, indicating the remote has been successfully learned. </font></li> <li><font size="3">Step 7: Program Any Additional Remotes Immediately repeat Step 6 for each remote you want to program. Be sure to include all existing remotes, as any that are not programmed during this session will no longer function. </font></li> <li><font size="3">Step 8: Exit Programming Mode To exit, turn the ignition to the ON position without starting the engine. Remove the key and confirm the programming session has ended. </font></li> <li><font size="3">Step 9: Test the Remotes Test each remote by locking and unlocking the doors to confirm successful programming.</font></li> </ul>
