even if i dont have keyless entry?

 

Yes. The BCM does a lot more than interface with the RKE module when equiped with RKE.

 

something weird happened tonight on my way home.

none of my symptoms happened. no radio turning off. no dash reseting or blinking off. headlights not dimming. nothing out of the ordinary.

is it possible that one of the cables was loose?

 

It sure sounds like an ignition switch problem. Have you tested the contact resistance across the ignition switch?

 

even if the scan indicated the bcm and not the ignition?

could you explain how?

 

If the BCM looses power, it could trigger the code you are getting.

The link in my signature has wiring diagrams. Test the resistance on the wiring into & out of the ignition switch as indicated in the diagrams. Resistance shouldn't be more than a few ohms and should be consistent if you cycle the ignition switch.

 

reading that diagram is like reading chinese. i can not figure it out.

 

Do you have or know what a Multi Meter is? If not, go to Harbor Freight and buy one for $5.
All Swartlkk is telling you to do is to check the electrical resistance across the terminals or contacts of the ignition switch. Heck, if you just look at the ignition switch you can see if any of them has a discolored area around it. If so, replace the igntion switch as this can cause really strange problems.

 

i know what a DMM is im into car audio. we use it to measure voltage and ohm load and speakers. i will go to HF and pick up one. now when checking the resistance does require me to pull the ignition out?

 

You only have to disconnect the main harness under the steering column. To access the harness connector, you must first remove the hush panel under the driver side dash as well as the trim panel under the steering column (the one right in front of your knees when seated in the driver seat). You may also have another metal bracket that may have to be removed (can't remember what's under the dash in an s-series, it's been awhile since I've been into one).

Once you have the connector apart, identify the wires that run to each one of the ignition switch contacts as shown in the wiring diagrams previously mentioned. Turn the switch to the position at which the contact you are inspecting closes and note the resistance. Cycle the switch a few times and see if the resistance changes.