ok edito, por lo que he podido indagar creo que llevas razón... el circuito del airbag de piloto está abierto... te lo marco en rojo pero cerciónate de que es ese el código que has leído!
http://www.miata.net/garage/airbag_blink.html_____________________
Airbag Blink Codes
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'90-'93# of Flashes Possible Cause
ON Faulty diagnostic module or poor connection of diagnostic module connector
2 Poor ground of all D-sensors
3 Open Circuit or poor connection of power source circuit
4 Faulty S-sensor
5 Fault D-sensor (D-sensor remains ON)
6 Faulty air bag modules or poor connection of clock spring connector
7 Poor ground of wiring harness
8 Poor ground of D-sensor
9 Open circuit between diagnostic modules and D-sensor
10 Faulty diagnostic module (System-down fuse burned)
'94Light remains ON - Poor connection at airbag computer
12 - Open circuit power source
13 - D sensor ON
21 - Poor installation S sensor
22 - S sensor ON
23 - Open connection S sensor feed circuit
24 - S sensor diagnostic circuit open
32 - Open circuit driver side airbag module33 - Open circuit passenger side
34 - Short circuit driver side airbag module
35 - Short circuit passenger side
41 - Open circuit between D sensor and computer
44 - Poor installation of right side D sensor
45 - Poor installation of center D sensor
46 - Poor installation of left D sensor
51 - System Down fuse open
52 - Damaged back-up battery
53 - Damaged computer
Flashes continuously - Poor connection of all D sensors
'95 - '97remains on - bad computer
3 - bad power
6 - driver side airbag
7 - passenger side airbag
1999-20021 - computer connector
2 - bad computer
3 - bad power
6 - driver side airbag
7 - passenger side airbag
49 (4 long pulse then 9 quick pulse) - passenger deactivation switch
2003-200501 - SAS control module connector poor connection
02 - SAS control module
03 - Power supply of SAS control module
06 - Driver-side air bag module system
07 - Passenger-side air bag module system
11 - Driver-side pre-tensioner seat belt system
12 - Passenger-side pre-tensioner seat belt system
49 - Passenger air bag deactivation system
61 - Crush zone sensor system
91 - Air bag system warning light circuit
__ - Continuously flashes - Deployment authorization standby code