Air Bag stay on BMW Z3 2003?

should be the engine light blinking the code flash

paper clip trick on the diagnostic port
no information on 64

if you have an air bag fault needs the obd2 diagnostic reader
to locate the fault ,, fix ,, then reset the srs system

yes, they will reset the airbag light via diagnostics machine. u can buy one for around the same price, just make sure you get the correct obd2 device for your vehicle.

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Best tool to reset SRS light - MBWorld.org Forums

You would need a code scanner of reading codes for the airbag system.
OBD2 code scanner

you can get the light reset by anyone with a diagnostics computer if the airbag is still working ok

i understoodd that an air bag error code must be reset by a OBDII reader, not on it's own.

so this may only be a light that is failing when it goes out (i.e. means you may strill not have air-bag operation just because the lights out.
you need to have the codes read to know if there is a general fault with the air bag system or it is a specific bag.

Looks like your going to have to bring it to a dealer. There isn't much you can do to repair an air bag fault on a BMW without using an oem level scan tool. Most Independent repair shops won't have the equipment needed to diagnose it. It could run into big money but usually air bag faults are either sensors or the clock spring in the steering column. In either case, keep in mind with the air bag light on the air bag system is disabled.

The side impact air bag in the door? Unhook the battery. Wait 5 minutes, then unbolt it and unplug it. It will be fine. Don't hook up the battery with the air bag unplugged to test the window, it will set a trouble code and the air bag light will be on until you go to the dealer and have it reset. Just make sure before you hook the battery back up the airbag is bolted back in place and plugged in.

If the only code 52 is flashing then system is ok and just needs to be cleared.Look behind the glove box and find the gray 2 wire connector.It will be on the left side behind the glove box and follow the proceedure below. Once a fault has been serviced, the associated diagnostic trouble code may be cleared from NVM. Only diagnostic trouble codes that the air bag diagnostic monitor sees as repaired or intermittent may be cleared (diagnostic trouble codes 52 and above). In no circumstances can hard fault conditions (diagnostic trouble codes 45 and below) be cleared.

1. Follow the diagnostic procedures as outlined to service the fault condition flashing on the air bag indicator.

1. Cycle the ignition switch to OFF and then to RUN.

1. Observe air bag indicator prove-out (six ±two seconds) followed by diagnostic trouble code (52-85) flashing completely one time.

1. Locate the Diagnostic Service Connector located underneath the glove compartment containing Circuits 631 (T/R) and 57 (BK).

1. Use a jumper wire to short Circuit 631 (T/R) to Circuit 57 (BK) or to another good ground.

1. Hold short until air bag diagnostic monitor tone sounds (approximately five seconds).

1. Release short on Circuit 631 (T/R) to Circuit 57 (BK). Diagnostic trouble code is now cleared from NVM. Next highest priority diagnostic trouble code stored in NVM (if one exists) will begin flashing
   

try wigglying the wires under the front seats,doesnt always work but sometimes it does.Other than that dealer!!!!!! as software is encrypted and it will show a different fault number to what it actually is.