When the customer has two or more valid keys

Fig 1: Replacement Key

Courtesy of MAZDA MOTORS CORP.

Cut new transponder-equipped key(s).
Using key 1, turn ignition switch to ON position.
1. Observe illumination of security light in instrument cluster.
2. After the security light turns off (after approx. 3 seconds from when ignition switch is turned to the ON position), turn key 1 to the LOCK position within approx. 4 seconds and remove it from the steering lock.
Repeat Step 2 with key 2.
Repeat Step 2 with key 3.
If there are 4-8 keys (new keys), repeat Step 2.
Verify that the engine starts using the programmed key.