Note On Intermittents
WARNING: This page is about a different car, the 1990 Cadillac Seville and 1990 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
If code is intermittent, check for short to ground or voltage on circuit No. 229, intermittent open in that circuit or intermittent loss of power to module.