Ignition turned to zero (off) and with key out.

Then you have to disconnect the negative terminal and insulate the negative terminal on the battery. I usa a plastic lunch bag

Then go into the passenger foot well and disconnect the Red Airbag Test Coupling (x11/13). This will disable Airbag from accidental discharge.

Then unscrew the two-torx screws on the underside of steering wheel and remove air bag. On re-assembly these are torque to 6 nm.

The rest should be self-explanatory.

Hope This Helps!

__________________
William
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1987 420 SEL - Like a fine wine only better with age