Engine Control Module: Notes
WARNING: This page is about a different car, the 2003 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Turn OFF ignition when installing or removing ECM connectors and disconnecting or reconnecting power to ECM (battery cable, PCM pigtail, PCM fuse, jumper cables, etc.) in order to prevent internal ECM damage. In order to prevent any possible electrostatic discharge damage to ECM, do not touch connector pins.