Suzuki radios unlocked online — from the serial printed on the unit’s casing.
A Suzuki head unit asks for its code after any interruption to the power — most often after a battery change.
The serial is on the label on the casing, so the unit has to come forward out of the dash. Nothing on the dashboard, the windscreen or the service book carries it.
Look for the 14-character string starting SU and type it exactly as printed.
Two other numbers sit close to it and neither one works: the part number (39101-86G1, 39930-62RA6 — five digits, a dash, then more) names the model of unit, not yours, and the VIN (MA3EWB32S00138028 — 17 characters, on the windscreen or door pillar) belongs to the car. If what you are holding has a dash in it, it is the part number.
This rule has no owner confirmation yet, so the code is free — unlocked by a share, and we ask you whether it worked.
Serial number example:
SU685AA9025712
A number with a dash in it is the part number — it names the model of radio, so it is the same on thousands of cars and cannot produce your code:
39101-86G1