2009 Acura MDX
Express Key Programming in Ventura County

Q: What exactly is a remote flip key on this MDX?

On the 2009 Acura MDX, it is a single unit that combines three things. First, a mechanical blade cut to the HON66 keyway. Second, a Philips ID46 transponder chip that talks to the immobilizer. Third, a 315 MHz remote transmitter board for lock, unlock, hatch, and panic. The battery is a CR1616, listed by Acura as 72148-S0A-000. The transponder is what lets the engine start. The remote only handles the doors and alarm. You can program the remote portion with a key cycle sequence, but the immobilizer chip requires professional diagnostic equipment.

Q: What tools do you use to program MDX keys?

For a 2009 MDX I use dealer-level diagnostics that can handle Honda and Acura Type 6 GEN4 immobilizer systems. That means registering the ID46 chip through the OBD port, not guessing. If all keys are lost, the system goes through a timed security access before it accepts new keys. I also carry HON66 Lishi tools for decoding and cutting on site. Generic locksmiths often skip Acura because they do not invest in the right software for Honda platforms. This MDX is not a hardware store copy job.

Q: My green key light is flashing and it won’t start. Is it the fob battery?

Blunt answer. No. On this MDX, a dead CR1616 only affects the remote buttons. The immobilizer chip does not use that battery. If the green key indicator on the dash keeps blinking and the engine cranks but will not fire, the car is not recognizing the transponder. That can be a damaged ID46 chip inside the key, a lost registration in the immobilizer unit, or in rare cases the ignition antenna ring around the key cylinder. Battery swaps do not fix that.

Q: Can I program a replacement remote myself?

For the door locks, yes. For starting the car, no. The 2009 MDX allows you to enter remote programming mode by cycling the ignition and pressing the lock button in sequence. But once you enter that mode, it erases all stored transmitters. Every remote has to be programmed during the same session. The immobilizer side is different. Adding or replacing the ID46 transponder requires a scan tool that can access the Type 6 GEN4 system. There is no button trick for that part.

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It was August in Oxnard, parked near Lemon Grove Plaza. Her 2009 Acura MDX had just come back from the vet. Dog in the third row. Engine off. Windows cracked.

She hits unlock on the remote flip key. Nothing. No flash, no click. FCC ID N5F0602A1A, four buttons, Driver 2 key, part 35111-STX-329. I see these all the time on the second gen MDX.

First move was getting the door open so the dog could get out of the heat. Mechanical side was fine. The problem was inside the remote head. When I opened it up, the CR1616 had leaked and the battery contacts were crusted. Acura even had a bulletin years back, 07-046, about remote transmitters quitting because the coin cell fit loose in the holder and lost contact. This one went a step further and corroded the board.

This MDX runs the Type 6 GEN4 immobilizer with an ID46 chip in the key head. The remote and the transponder are two different jobs. I cut and programmed a fresh remote head key, registered it through the OBD port, and tested lock, unlock, rear hatch, and panic. Green key light went out like it should.

From call to engine running was under an hour. She didn’t have to wait on a dealer appointment or leave the car sitting in that parking lot.

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How do I spot a fake locksmith for my 2009 MDX?▼

Start with the basics. If they cannot tell you your 2009 MDX uses a Type 6 GEN4 immobilizer and an ID46 transponder, that is a red flag. Your OEM remote head key should be FCC ID N5F0602A1A. Driver 1 and Driver 2 have different part numbers, 35111-STX-326 and 35111-STX-329. A real automotive locksmith knows that and will ask which memory key you want. If they quote a tiny service call and say they will decide the rest on site, walk away. If they say “no guarantee on programming,” walk away faster.

What exactly is a remote flip key on this MDX?▼

What tools do you use to program MDX keys?▼

My green key light is flashing and it won’t start. Is it the fob battery?▼

Can I program a replacement remote myself?▼

Questions? Call (805) 790-8162