[s-cars] 93 Infrared Key Not Working

[Bruce Mendel]

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My main key is no longer working when aimed at the IR receiver on either door.

The car was in the shop, and seat and window switches were removed, and battery was most likely disconnected at come point. Batteries in the key are new, and it worked fine.

I remember a thread on this, but cleverly can not find it now. Can someone remind me of the procedure for resetting the key to work via Infrared?

Thanks.

Bruce
93 S4, no wireless key