tire pressure system disabled okay, but little square light still comes on?

[low miler]

After giving the directions to disable the cumbersome tire pressure monitoring system on my '91 S4 given to me by DSC928 (thank you!) and then promptly passed on to mechanic to perform the task, the digital readout now no longer activates (thank God!), but that little red light at the top right corner which always stays on after you clear the initial warning lights still comes on after about 10 feet of driving. It's the only light that comes on now, but I'd like to get it out as well. I tried disconnecting both battery terminals for 2 hours, but it still comes on. Does it perhaps need to have the code cleared now with the "Hammer" or something? Has anyone else had this problem and is there something my tech missed or can do to complete this job once and for all? Any help would be greatly appreciated.

Todd

[SeanR]

I think on Ang's '90, the PO took the light bulb out.

I'm guessing here.