I wreaked my 98 bmw 528i air bags deployed the car was still running I killed the ignition tried to crank the car and it just clicks.

Yes if your airbags are deployed it does kill it on some vehicles im suprised your vehicle even cranked

BMW 528i won't start - YouTube

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www.youtube.com/watch?v=qEGz4Q6FGVI
Feb 22, 2012 - Uploaded by willnbren2
I have a question regarding my 98 528i , it will crank once but not start then I retry it won't crank but I can hear the fuel pump humming , I have to ...

SIR DISABLE:
DRIVER SIDE
Many service procedures require the air bag system to be disabled to prevent accidental deployment. The air bag system can maintain sufficient voltage to cause deployment for up to 2 minutes after the ignition switch is turned off, the battery ground cable is disconnected or the DERM fuse is removed. If the inflator module is disconnected from the deployment loop by the following procedure, service can begin immediately without waiting for the 2 minute time period to elapse.

1. Turn steering wheel so that vehicle wheels are pointed straight ahead.
2. Turn ignition switch to Lock position and remove key.
3. Remove air bag fuse from fuse block.
4. Remove steering column filler panel.
5. Remove Connector Position Assurance (CPA) and disconnect yellow two-way connector at base of steering column, Fig. 1.

PASSENGER SIDE

1. Remove air bag fuse from fuse block.

SIR ENABLE:
Driver Side

1. Turn ignition switch to LOCK and remove key.
2. Connect yellow two-way connector and install connector position assurance (CPA).
3. Install steering column filler panel.
4. Insert air bag fuse into fuse block.
5. Turn ignition switch to RUN and verify that the air bag warning lamp flashes seven times then turns off.

Passenger Side

1. Turn ignition switch to LOCK and remove key.
2. Insert air bag fuse into fuse block.
3. Turn ignition switch to RUN and verify that the air bag warning lamp flashes seven times then turns off.

This means that one or more of the air bags is leaking.

Possible faulty ignition switch. common problem on ALL bmw's.

You need to check you are getting power at the crank wire when you try to crank the engine. Also check that the crank signal (12v) is also getting to the starter (could be dodgy wire between ignition and starter).

I am not 100% certain, but to the best of my knowledge, on this car, the safety circuit monitors only for a spark pulse. It is not connected to the SRS system. If you kill the engine (as often occurs in an accident) and it does not detect the ignition pulse it expects, it shuts off the fuel pump.
I had an '87 once that would not cycle back on when everything was fixed. I had to short between fuses #4 and #6 to 'hot wire' the fuel pump to start the car. Once I had started the car and turned it off normally, I removed my jumper from the fuses and everything worked fine.

Turns out it was the ignition switch (Various lights and radio)and clock spring (air bag light). Both were simple replacements with common hand tools. Simply go to youTube and watch any of the number of videos. Clock spring took me 20 minutes to replace. The ignition switch 45 minutes. Just remember to unhook your battery before you begin.

did you by any chance have some electrical work done and if so was the battery connected???welding maybe....? the car has gone into shutdown mode(after an accident)it will need bringing back to life by a bmw dealers computer.(so im told by my bmw dealer friend)

dead battery

disconnect battery positive and negative to prevent air bag deployment