
I just done this in the Mazda 6 MPS, it's nothing similar to the 3.
Anyway, I got rid of that dreading beep![]()
05 MPS 6 - Black "Lux" 235kW atw / 600nM
GT30/71R, FORGED UP, CPe Ex Mani, Tail EWG, ETS 3.25" TMIC, CPe 4" TIP & 3" MAF housing + BMC SRI, Custom 3" TBE, CPe HPFP, TurboSmart Dual Port BOV, SURE Rear Diff Front mount & Brace, AWR SEM's, CPe REM, JBR SS + Bushings, Perrin EBCS pro, Spec Stage 3+ Clutch, Fidanza Lightweight Flywheel, Custom Head Unit, Car-LED Tails, 6000K HIDs, Auto Head-light Kit, Mugen Visors, LED conv., Pedders "Super-Lows"

The key beep reminder plug is a 2 wire connector, not just a single red wire with the black stripe on it.
And the connector is on the same housing as the key insert which is on the right side, looking from the pictures for the 3 it looks like it's on the left side.