Question 1

Are you licensed and insured to work on Cadillac vehicles?

Accepted Answer

Yes. EZ Car Keyz is fully licensed through the California Bureau of Security and Investigative Services (BSIS License LCO#6792) and carries full insurance. We have the diagnostic tools and programming capability to work on the 2004 Cadillac Seville's transponder and immobilizer system. Not every locksmith does. Some shops have generic key cutters but lack the programming equipment for GM vehicles from this era. If a locksmith can't tell you upfront how they handle the transponder enrollment on a 2004 Seville, that's a signal to keep looking.

Question 2

How do I know you are not a scam locksmith?

Accepted Answer

Scam locksmiths have a pattern Cadillac owners run into often. They quote a low price on the phone, show up, then invent reasons to charge more once your car is already apart or they're already on site. The Cadillac badge makes it worse because some will tell you the key work costs more because it's a luxury vehicle, with no technical reason behind it.

A real locksmith will give you a specific estimate for your 2004 Cadillac Seville over the phone, explain what the job actually involves, and have a verifiable business name with real reviews you can check before they arrive. We have over 100,000 followers across our YouTube and TikTok channels where you can watch exactly how we do this work before you ever call us.

Question 3

Will the replacement key work exactly like the original?

Accepted Answer

Yes. A properly programmed replacement transponder key for your 2004 Seville communicates with the immobilizer the same way the original does. Engine starts and stays running, no stall, no warning light. The blade is cut to your vehicle so it works the lock cylinder as expected.

The failure mode people run into is buying a key blank online and either skipping programming entirely or having it done by someone without the right equipment for this system. The blade might turn but the car stalls immediately because the chip was never enrolled. We test the key on site before we leave so you're not finding that out in a parking lot later.

Question 4

My 2004 Seville starts fine but the security light stays on while I'm driving. Should I be worried about losing the key?

Accepted Answer

A security light that stays on while the car is running is worth paying attention to on these. It can mean the immobilizer system has logged a fault, or the transponder read was marginal at startup. The car started, so the chip communicated well enough to allow it, but the system flagged something in the process.

It doesn't mean the key is about to fail today, but it's an early sign. What happens eventually is the read gets worse until one start attempt the chip doesn't communicate cleanly enough and the engine cranks but immediately dies. Getting a diagnostic scan done while the car is still drivable is the smarter move than waiting for a full no-start.

Question 5

Can I use the onboard relearn to add a spare key myself on a 2004 Seville?

Accepted Answer

Sometimes. The 2004 Seville does have an onboard procedure that can enroll an additional key if you already have a working programmed key. The sequence involves using your existing key in the ignition to put the system into learn mode, then presenting the new key. It's not guaranteed to work on every vehicle depending on condition and history, but it's a legitimate path when you have one good key and want a spare.

The catch is that it only works if you already have at least one functional programmed key. If that key is gone or the chip is dead, the self-learn window isn't available and you need diagnostic equipment to start from scratch. If you're in that all-keys-lost situation in Shadowridge and want to avoid the dealer wait, that's exactly when to call.

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