1999 GMC Sierra

<h1>1999 GMC Sierra – Remote Key Fob Programming Instructions Instructions</h1> differ depending on whether your vehicle is the New Body Style or Old Body Style. For New Body Style: Important: Follow these steps to enter programming mode and pair up to four remotes. Step-by-Step Instructions: <ul> <li>Step 1: Ensure all doors are closed. </li> <li>Step 2: Insert the key into the ignition, but do not turn it yet. </li> <li>Step 3: Press and hold the power UNLOCK button on the driver’s door. Continue holding until Step 9. </li> <li>Step 4: Complete the next steps (5 through 8) quickly and in sequence: </li> <li>Step 5: Turn the ignition to the ON position (without starting the engine). </li> <li>Step 6: Turn the ignition to the OFF position. </li> <li>Step 7: Turn the ignition to ON again. </li> <li>Step 8: Turn the ignition back to OFF. </li> <li>Step 9: Release the power UNLOCK button. The door locks should automatically cycle (lock and unlock) to confirm the vehicle has entered programming mode. If the locks do not respond after releasing the button, remove the key, open the driver’s door, and begin again from Step 1. </li> <li>Step 10: Press and hold the LOCK and UNLOCK buttons on the first remote at the same time. Hold until the door locks cycle again—this may take up to 30 seconds. </li> <li>Step 11: Repeat Step 10 for any additional remotes, including existing ones. All remotes must be programmed during the same session. </li> <li>Step 12: Turn the ignition to the ON position to exit programming mode. </li> <li>Step 13: Test each remote to confirm proper operation. </li> </ul> For Old Body Style: Important: This procedure uses the Data Link Connector (DLC) under the dashboard. Step-by-Step Instructions: <ul> <li>Step 1: Locate the Data Link Port beneath the driver's side dashboard. Identify pins 8 and 4 (the top row of the port is wider). </li> <li>Step 2: Verify that metal contacts are present in pins 8 and 4. Use a jumper wire to connect pin 8 to pin 4. Keep the jumper wire connected during the entire process. The vehicle will confirm entry into programming mode by locking and unlocking the doors automatically. </li> <li>Step 3: Press and hold the LOCK and UNLOCK buttons on the first remote simultaneously. After about 15 seconds, the doors will lock and unlock to confirm successful programming. Release the buttons. </li> <li>Step 4: Within 60 seconds, repeat Step 3 for each additional remote you want to program.</li> <li> Step 5: Remove the jumper wire from the Data Link Port.</li> <li> Step 6: Test all remotes to ensure they operate correctly.</li> </ul>

1999 GMC Sierra

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