Lear 4-Button Remote Key Fob (FCC ID KOBLEAR1XT) – Fitment & Details

By Mohammad H. Abdelhadi, ALOA-Certified Master Locksmith, mobile automotive locksmith. Reviewed by Ray Obar, Master Locksmith. Updated June 1, 2026.

Fitments for the Lear 4-Button Remote Key Fob (FCC ID KOBLEAR1XT) span a wide range of General Motors vehicles produced from the mid-1990s through the early 2010s, including the Chevrolet Silverado, Tahoe, Suburban, Impala, Corvette, and Cadillac Escalade, among many others. Across all of these platforms, the unit transmits keyless entry commands at 315 MHz—a frequency standard across GM’s North American lineup during that era. Each Lear 4-Button Remote Key Fob (FCC ID KOBLEAR1XT) features four buttons typically mapped to lock, unlock, panic, and a hatch or trunk release function, depending on the specific vehicle body style. Owners replacing the fob should expect a programming procedure that involves the vehicle’s onboard diagnostic port or a learn-mode sequence accessible through the ignition cycle. When ordering a Lear 4-Button Remote Key Fob (FCC ID KOBLEAR1XT), confirm that the FCC ID printed on the back of the existing remote matches KOBLEAR1XT to ensure compatibility.

Complete Vehicle Fitment List for the Lear KOBLEAR1XT

The KOBLEAR1XT covers a substantial portion of GM’s truck, SUV, sedan, and van lineup. Below is a comprehensive breakdown of validated fitments organized by make:

Buick

• LeSabre (2000–2005)

Cadillac

• Escalade (2002–2006)
• Seville (1998–2004)

Chevrolet

• Astro (1995–2005)
• Avalanche (2002–2006)
• Blazer (1995–2005)
• Corvette (1997–2004)
• Express (2003–2007)
• Impala (2006–2013)
• Malibu (1997–2003)
• Monte Carlo (2000–2007)
• S-10 (1994–2004)
• Silverado (1999–2007)
• Suburban (2000–2006)
• Tahoe (2000–2006)

This breadth of coverage reflects the fact that General Motors standardized remote keyless entry hardware across multiple divisions and body platforms during the late 1990s and 2000s. The same Lear-manufactured transmitter—identifiable by its KOBLEAR1XT FCC designation—served duty in everything from the compact S-10 pickup to the full-size Suburban and the luxury-oriented Cadillac Seville. Because of this platform sharing, replacement units are widely available and well-understood by automotive locksmiths.

Lear 4-Button Remote Key Fob (FCC ID KOBLEAR1XT) Technical Overview

Lear Corporation, now a major global automotive supplier, manufactured this remote transmitter under FCC certification KOBLEAR1XT. The device operates at 315 MHz, which was GM’s standard RF frequency for keyless entry across the North American market during the production years covered by this SKU. The four-button layout provides the driver with core remote functions without requiring physical key insertion for door lock and unlock operations.

The housing is a self-contained plastic shell with a rubber button pad bonded to the front face. Inside, a small circuit board holds the RF transmitter, a rolling-code generator IC, and a single coin-cell battery—typically a CR2032, though owners should confirm against the battery compartment markings on their specific unit. The rolling-code architecture means the fob cycles through a synchronized sequence with the vehicle’s receiver module, preventing simple replay attacks on the RF signal.

Programming Procedures

Programming this remote to a compatible GM vehicle can follow one of two paths, depending on the model year and platform:

On-Board Programming (OBP)

Many of the GM vehicles in the fitment list above support a self-learn procedure that does not require professional scan tool access. The general sequence involves cycling the ignition between the “On” and “Off” positions a prescribed number of times, then listening for the door locks to cycle—an audible confirmation that the body control module (BCM) has entered learn mode. Once in learn mode, pressing and holding the lock and unlock buttons simultaneously on the new remote for several seconds completes the pairing. The locks will cycle again to confirm successful enrollment.

It is worth noting that exact step counts and timing windows vary between platforms. The procedure for a 2004 Corvette, for instance, differs slightly from that of a 2005 Tahoe. Locksmiths and owners should reference the specific vehicle’s service documentation rather than relying on a single generic write-up.

Scan Tool Programming

Some model years—particularly later Impala and Monte Carlo variants—may require a diagnostic scan tool connected to the OBD-II port to enter the BCM’s remote learning mode. This is the more common approach when the OBP sequence has been disabled or when all previously programmed remotes have been lost, since the BCM needs at least one recognized transmitter to initiate the on-board learn cycle on certain platforms.

Professional automotive locksmiths typically carry aftermarket or OEM-grade scan tools capable of initiating this procedure. For vehicle owners without scan tool access, a locksmith visit is the practical route in this scenario.

Identifying the Correct FCC ID

GM used several visually similar four-button remotes during this production window. The FCC ID is the definitive identifier—not the button layout, case color, or logo stamping. The KOBLEAR1XT designation is printed on a label on the rear of the remote housing, typically alongside an IC (Industry Canada) number. Before purchasing a replacement, flipping the existing remote over to confirm this string is the fastest way to avoid ordering the wrong part.

Other common GM FCC IDs from this era—such as KOBUT1BT, KOBGT04A, and various Delphi-manufactured units—may look similar but are not interchangeable with the Lear KOBLEAR1XT without reprogramming considerations. Mixing FCC IDs within a single vehicle’s enrolled remote set can sometimes succeed, but it introduces unpredictable behavior and is not recommended.

Battery Replacement and Maintenance

The remote’s effective range will gradually decrease as the internal battery depletes. A fresh coin-cell battery typically restores full range—often 30 to 50 feet or more in open conditions. The case splits apart along a seam at the midpoint; a small flathead screwdriver or a coin can pry it open without cracking the housing if inserted carefully at the seam line. After swapping the battery, the fob does not require reprogramming—it retains its rolling-code synchronization through power cycles.

If the remote fails to respond after a battery change, pressing any button 15 to 20 times in rapid succession can resynchronize the rolling code with the vehicle’s receiver. Persistent non-response after resync and battery replacement usually indicates a failed circuit board or a BCM that has dropped the remote’s code, requiring a full reprogram.

OEM vs. Aftermarket Considerations

Because the KOBLEAR1XT has been out of initial OEM production for well over a decade, the aftermarket dominates the replacement market. Aftermarket units replicate the original Lear circuit design and use the same FCC-certified frequency and modulation scheme. Quality varies between suppliers; higher-tier aftermarket remotes use OEM-equivalent rubber button pads and PCB components, while budget options may exhibit reduced button tactility or shorter battery life due to higher quiescent current draw on the transmitter IC.

Genuine NOS (new old stock) OEM units from Lear surface occasionally through specialty auto electronics vendors, though pricing typically carries a premium over aftermarket equivalents. For most practical purposes, a well-sourced aftermarket KOBLEAR1XT programs and functions identically to the original.

Related help: Buick auto locksmith, Cadillac auto locksmith, Chevrolet auto locksmith, GMC auto locksmith, car key replacement, car key programming.

Compatible and related keys: compatible Bosma Remote Key Fob (FCC ID KOBUT1BT), Strattec Mechanical Key Blank (B102), Aftermarket Remote Key Fob (FCC ID AB01502T), compatible GM Mechanical Key Blank (GM39), Bosma Remote Key Fob (FCC ID OUC60270), related key: Strattec Transponder Key (chip ID46), related key: GM OEM 3-Button Remote Key Fob (FCC ID LHJ011), Continental Automotive Smart Key Fob (FCC ID NBGGD9C04), Strattec Smart Key Fob (FCC ID HYQ1AA), Strattec Smart Key Fob (FCC ID HYQ1EA).