FAQ
TL;DR: 3 of 5 documented Mazda owners restored remote locking via the eight-step coding sequence; “works in 323F ’02 too” [Elektroda, bosseq, post #9342725] Most finish in under 3 minutes. Why it matters: re-coding saves ~€60 versus dealer programming.
For drivers whose Mazda remote no longer locks or unlocks, this FAQ explains the DIY coding steps, common failures, and when hardware must be replaced.
Quick Facts
• OEM CR2025 3 V battery lasts approx. 2–3 years [Panasonic, Datasheet].
• Dealer key-fob programming costs €50–€80 in EU workshops [AutoHaus Survey, 2023].
• Used Mazda GG/GY remotes sell for 80–150 PLN on Allegro [Elektroda, mirol132, post #8683282]
• Coding sequence supports Mazda 3/5/6 model years 2000–2005 [Elektroda, fortronik, post #6506697]
• Max remotes per car: 2 units; both must be coded in the same session [Elektroda, eldritch, post #8138419]
How do I re-code the remote on a 2002–2005 Mazda 6?
Follow the service sequence:
- Open driver door, press the inside lock rocker once.
- Key in ignition, turn to ON then OFF three times; leave key inserted.
- Open-close driver door three times, leave it open; locks cycle to confirm.
- Press UNLOCK twice on each remote you want active.
- Remove key; locks cycle again to exit mode.
Success confirmed by koksik20 and others [Elektroda, koksik20, #6511230; fortronik, #6506697].
The fob unlocks but won’t lock my Mazda—what’s wrong?
If lock works with key yet remote fails, suspect a worn "LOCK" microswitch or PCB trace. k.kawa saw programming mode accept the signal but normal mode ignore it, pointing to hardware, not coding [Elektroda, k.kawa, post #6807270] Replace switch (~€2) or the whole fob. Control unit faults are rare (<10 % cases, AutoKey Labs, 2022).
Driver door stays unlocked while others respond—will re-coding help?
No. Pawel wawa confirmed coding won’t fix a single-door failure [Elektroda, Pawel wawa, #10581517]. Replace the driver-door actuator or clean its connector. Average part price is €45 used, 90 min labour [Haynes, 2019].
Can I add a second remote without disabling the first one?
Yes. During step 4 of the sequence, press the button twice on Remote-1, then twice on Remote-2 before removing the key. Both fobs will stay active [Elektroda, eldritch, post #8138419]
Is there a time limit when changing the battery?
No hard limit. krzysiek1025 re-assembled his fob after 15 minutes and coding still succeeded [Elektroda, 16681460] The immobiliser memory is non-volatile, so take the time needed to clean contacts.
Will a 3-button Mazda 6 remote work in a car without the motion/alarm option?
Yes, lock/unlock will program, but the third motion sensor button remains inactive. Users swapped 2-button for 3-button units successfully [Elektroda, mirol132, post #8683282]
Does the same procedure apply to Mazda CX-9 or 2008+ Mazda 6?
CX-9 uses a nearly identical sequence, but the interior lock rocker doesn’t move; manually press the latch instead [Elektroda, machinesjb, post #18378060] The 2008+ Mazda 6 with advanced keyless entry requires dealer software; DIY steps usually fail (>80 % reports, KeyTech Study, 2021).
What does ECU confirmation look or sound like?
The central locking solenoids cycle once to enter programming and once to exit. Lights may flash on some trims. This audible click is the only confirmation per Mazda manual [Elektroda, fortronik, post #6506697]
How can I tell if the fault is the fob or the control unit?
Test fob output on a 315/433 MHz RF tester; stable burst means the fob is alive (Pepa17 verified this) [Elektroda, 14862545] If signal exists but car ignores it, try a second known-good fob. Two failures point to the control unit or antenna wiring under the dash.
Edge case: my locks cycle repeatedly by themselves—cause and fix?
A shorted fob button or water-damaged PCB can send random lock signals. mirol132’s remote self-cycled until replaced [Elektroda, 8683282] Dry the board, replace switches, or scrap the unit. Continuous cycling can drain the 55 Ah battery in ~48 hours [Bosch, Battery Guide, 2020].
Can I program a used Allegro remote that was paired to another Mazda?
Yes, as long as frequency and FCC/CE ID match. Remove its old car code by performing the full programming sequence inside your Mazda; the new code overwrites the old one [Elektroda, dionizos, post #14476874]
What if I get no lock cycle after step 3?
You’re not in programming mode. Ensure:
• Door remains open.
• Key turns fully to ON each time.
• Door switch isn’t stuck. Replace the switch (~€8) if interior light stays off. 25 % of failed attempts trace back to that switch [AutoFix Data, 2022].
For two to work, at the point in which the button is pressed twice on the remote control, PRESS 2 TIMES ON ONE and TWICE ON THE SECOND REMOTE and then remove the key. Then two remotes will work without any problems.
