Memory Erase (Single LED System)
WARNING: This page is about a different car, the 1993 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
Stored memory will be erased if battery is disconnected for 24 hours or diagnostic mode is switched from Mode II to Mode I (modes cannot be switched with engine running). To switch from Mode II to Mode I while in Mode II with engine off, turn diagnostic mode selector fully clockwise. Wait for at least 2 seconds, and turn mode selector fully counterclockwise.