How does the transmitter inside a car key operate and How to replace its battery on Mazda MX-5 Miata?

The internal transmitter is activated by opening the door of the driver when the UNLOCK button is released and when a second time is released within 4 seconds, both doors open. When you press the lock button it locks the two doors and switches on the alarm. As the the battery of the transmitter depletes its powers it becomes intermittent, needs to be brought nearer to the vehicle to work, and then it will cease to work any more. The process of changing the battery is thus to detach the key and the transmitter, then with a small flat-head screwdriver, press the tab and slide the key part off. Take great care in prying open the transmitter body using a small screwdriver by inserting it into the slot and "popping open the halves. Use a small screwdriver to remove the old battery and lay the new battery with the positive side to face up and cover it with a tight snap to avoid dirt, dust, humidity and rain to get inside the battery.

Genuine Mazda MX-5 Miata Car Key

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Mazda MX-5 Miata Transmitter Part Number: BBM4-67-5RY
$175.60 MSRP: $234.18
You Save: $58.58 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Transmitter Set, Keyless
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2009-2015 Mazda MX-5 Miata | 25th Anniversary Edition, Club, Grand Touring, Special Edition, Sport, SV, Touring | 4 Cyl 2.0 L GAS
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Mazda MX-5 Miata Transmitter Part Number: NHY3-67-5RYA
$187.56 MSRP: $250.13
You Save: $62.57 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Transmitter Set, Keyless
- Replaces: NHY3-67-5RY
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2015 Mazda MX-5 Miata | 25th Anniversary Edition, Base, Club, Club Spec, Grand Touring, Special Edition, Sport, SV, Touring | 4 Cyl 2.0 L GAS
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Mazda MX-5 Miata Transmitter Part Number: GJY9-67-5DY
$218.26 MSRP: $291.07
You Save: $72.81 (26%)
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Product Specifications
- Other Name: Transmitter, Keyless Entry
- Replaces: GJR9-67-5RY, GJR9-67-5DY
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2016-2020 Mazda MX-5 Miata | 100th Anniversary Special Edition, Club, Grand Touring, RF 100th Anniversary Special Edition, RF Club, RF Grand Touring, Sport | 4 Cyl 2.0 L GAS
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Mazda MX-5 Miata Transmitter Part Number: NFYR-67-5DY
$261.73 MSRP: $349.03
You Save: $87.30 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Transmitter, Keyless Entry; Transmitter
- Replaced by: NFYR-67-5DYB
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2021 Mazda MX-5 Miata | Club, Grand Touring, RF Club, RF Grand Touring, Sport | 4 Cyl 2.0 L GAS
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Mazda MX-5 Miata Transmitter Part Number: NFYR-67-5DYB
$261.73 MSRP: $349.03
You Save: $87.30 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Transmitter, Keyless Entry; Transmitter
- Replaces: NFYR-67-5DY, NFYR-67-5DYA
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2020-2023 Mazda MX-5 Miata | 100th Anniversary Special Edition, Club, Grand Touring, RF 100th Anniversary Special Edition, RF Club, RF Grand Touring, Sport | 4 Cyl 2.0 L GAS
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Mazda MX-5 Miata Transmitter Part Number: NHY8-67-5RYA
$337.58 MSRP: $450.19
You Save: $112.61 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Transmitter Set, Keyless
- Replaces: NHY8-67-5RY
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2015 Mazda MX-5 Miata | 25th Anniversary Edition, Base, Club, Club Spec, Grand Touring, Special Edition, Sport, SV, Touring | 4 Cyl 2.0 L GAS
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Mazda MX-5 Miata Transmitter Part Number: NF49-67-5RYB
$184.83 MSRP: $246.48
You Save: $61.65 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Transmitter Set, Keyless
- Replaces: NF49-67-5RY, NF49-67-5RYA
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2008 Mazda MX-5 Miata | Base, Club Spec, Grand Touring, Sport, SV, Touring | 4 Cyl 2.0 L GAS
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Mazda MX-5 Miata Transmitter Part Number: NFY7-67-5RYB
$354.94 MSRP: $473.34
You Save: $118.40 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Transmitter (W/O Battery)
- Replaces: FEZ9-67-5RY, NFY7-67-5RYA, NFY7-67-5RY
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2008 Mazda MX-5 Miata | Base, Club Spec, Grand Touring, Sport, SV, Touring | 4 Cyl 2.0 L GAS

Mazda MX-5 Miata Car Key

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Mazda MX-5 Miata Car Key Parts and Q&A

Transmitter
NHY3-67-5RYA
Q: How does the transmitter inside a car key operate and How to replace its battery on Mazda MX-5 Miata?
A:
The internal transmitter is activated by opening the door of the driver when the UNLOCK button is released and when a second time is released within 4 seconds, both doors open. When you press the lock button it locks the two doors and switches on the alarm. As the the battery of the transmitter depletes its powers it becomes intermittent, needs to be brought nearer to the vehicle to work, and then it will cease to work any more. The process of changing the battery is thus to detach the key and the transmitter, then with a small flat-head screwdriver, press the tab and slide the key part off. Take great care in prying open the transmitter body using a small screwdriver by inserting it into the slot and "popping open the halves. Use a small screwdriver to remove the old battery and lay the new battery with the positive side to face up and cover it with a tight snap to avoid dirt, dust, humidity and rain to get inside the battery.