Strattec 3-Button Remote Key Fob (FCC ID MYT3X6898B) – Key Guide

Programming a Strattec 4-Button Remote Key Fob (FCC ID GQ43VT20T) – Detail 3-Button Remote Key Fob (FCC ID MYT3X6898B) on mid-2000s GM-platform SUVs requires access to an on-board programming sequence or a professional-grade diagnostic tool, depending on the number of working remotes already paired to the vehicle. The procedure begins with cycling the ignition and pressing a specific button combination to place the body control module (BCM) into learn mode, after which the device transmits its rolling-code identity at 315 MHz for enrollment. Locksmiths working with this remote must confirm the BCM firmware revision before attempting enrollment, because certain early Trailblazer and Envoy model years used a slightly different learn-mode entry sequence. A Strattec 3-Button Remote Key Fob (FCC ID MYT3X6898B) that has been enrolled correctly will chirp the horn and flash the parking lamps as confirmation. Replacement units of this fob are widely used across the independent locksmith and automotive aftermarket channels, and the part remains a staple for servicing the GMT360 platform.

Vehicle Compatibility for the Strattec 3-Button Remote Key Fob (FCC ID MYT3X6898B)

This remote is validated for the following vehicles:

• Chevrolet Trailblazer — model years 2001 through 2009
• GMC Envoy — model years 2002 through 2009
• Isuzu Ascender — model years 2003 through 2008
• Oldsmobile Bravada — model years 2002 through 2004

All four nameplates share the GMT360 body-on-frame architecture, which means the body control module electronics and RF receiver are nearly identical across the lineup. The fob communicates on 315 MHz using a rolling-code algorithm. Because General Motors, Isuzu, and Oldsmobile shared this platform during overlapping production years, a single SKU covers the entire family — making it an efficient stocking choice for mobile locksmiths and dealership parts counters alike.

FCC ID MYT3X6898B — Technical Overview

The FCC ID MYT3X6898B designates a three-button transmitter manufactured by Strattec Security Corporation. Each of the three buttons corresponds to a discrete function: lock, unlock, and rear liftgate or panic, depending on programming configuration at the BCM level. The operating frequency of 315 MHz is standard for North American GM remotes of this era, and the unit relies on a battery — typically a CR2032 coin cell — to power the RF transmitter circuit.

Strattec Security Corporation is an OEM-tier supplier headquartered in Milwaukee, Wisconsin, and has manufactured lock cylinders, ignition assemblies, and remote keyless entry hardware for General Motors and other automakers for decades. Parts bearing the Strattec name are not aftermarket clones; they originate from the same production lines that supply assembly plants. This lineage means the internal PCB, button membrane, and housing materials meet factory durability specifications — an important distinction when sourcing replacements for customers who want genuine-quality components.

On-Board Programming Procedure

For vehicles that still have at least one previously programmed remote, the GMT360 platform supports a customer-level on-board programming (OBP) sequence that does not require scan-tool access. The general steps are:

1. Enter the vehicle and close all doors.
2. Insert the ignition key and cycle it to the RUN position without starting the engine, then back to OFF. Repeat this step a specific number of times within a defined time window (typically two rapid ON-OFF cycles within five seconds, though this varies by model year).
3. Listen for the door locks to cycle — this confirms the BCM has entered learn mode.
4. Press and hold both the Lock and Unlock buttons on the new remote simultaneously for approximately 15 seconds, then release.
5. The door locks will cycle again, confirming the fob has been accepted.
6. If additional remotes need to be paired, repeat step 4 for each unit within 30 seconds.
7. Turn the ignition to RUN and then OFF to exit learn mode.

If no previously working remote exists — for example, when all remotes have been lost — a diagnostic scan tool with BCM access is required to initiate learn mode. Locksmiths commonly use tools from Autel, Drew Technologies, or the GM Tech2 platform to enter the remote-learn routine through the BCM module’s service menu. Once learn mode is active, the pairing steps for the Strattec 3-Button Remote Key Fob (FCC ID MYT3X6898B) are the same as outlined above.

Battery Replacement and Maintenance

The housing of the remote snaps apart along a seam at the midpoint of the case. A small flat-blade screwdriver or plastic pry tool inserted into the seam slot separates the two halves without marring the plastic. Inside, the CR2032 battery sits in a retention clip on the circuit board. Orienting the replacement cell with the positive terminal facing the correct direction (marked on the board) is essential — reversing polarity can damage the transmitter IC.

After battery replacement, the fob should not require reprogramming. The rolling-code counter and pairing data are stored in non-volatile memory on the PCB. If the unit fails to operate after a battery swap, the most common cause is a weak solder joint on the battery clip or corrosion on the contact pads. Cleaning the contacts with isopropyl alcohol and a cotton swab typically restores function.

When to Contact a Professional Locksmith

Vehicle owners who have lost all programmed remotes, or whose BCM does not respond to the on-board programming sequence, should contact a qualified automotive locksmith. Mobile locksmith technicians carry the scan-tool hardware needed to force-enter learn mode on GMT360 vehicles and can program the Strattec remote on-site. This service is typically faster and less expensive than a dealership visit, and Low Rate Locksmith technicians are equipped to handle programming for the full range of Trailblazer, Envoy, Ascender, and Bravada model years covered by this fob.

Because the remote operates independently of the mechanical ignition key, owners replacing a lost or damaged unit do not need to have the key cylinder re-keyed unless the physical key itself is also missing. The two systems — remote keyless entry and mechanical ignition — are separate on GMT360-platform vehicles.