I've always wondered why you post these instructions? There is enough draw from all modules in the car that when you remove the positive, residual power will be drained very quickly. If I was going to follow this theory, I would simply disconnect the positive and touch it to the negative for a few seconds. Removing both is more work than necessary.If you have the RPO code You might try a system reset; it could help because these systems are never otherwise really 'off'. A failing battery or low charge incident can cause weird issues.
Disconnect Negative battery cable, Positive cable and touch together for a 3-count. Reconnect Positive, Negative and see if there's any change. You may have to reset window up position.