There could be such a thing as PassLock on your Suburban. You might have a "security" light lit on the dash. If so, the procedure is as follows:

Turn on ignition for 10 minutes.
Shut off and wait 20 seconds.
Turn on ignition for 10 minutes.
Shut off and wait 20 seconds.
Turn on ignition for 10 minutes.
Shut off and wait 20 seconds.

Start engine.


"There's more to optics than meets the eye."--anon

"...most of us would be better off losing half a pound around the waist than half a pound on our rifle."--dhg