Ok my in-laws have a 99 lesabre and the air bag light came. The interior lights are not coming on and a/c compressor not coming on this all happened in a day. Any ideas as to whats causing this maybe computer? Thank you for looking..

Possible bad ign switch or a main feed circuit is out check the master fuses first.

checked 3 fuse boxes with multimeter fuses are good

You need a factory based wiring diagram now to find the common feed for those systems.

You need a factory based wiring diagram now to find the common feed for those systems.

can any one assist me with this...

Does anyoone have a diagram they could share or tell me where those feeds might be. Thanks