WARNING: This page is about a different car, the 2002 Cadillac Seville, 2002 Cadillac Eldorado, and 2002 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Locating AIR Relay
Courtesy of GENERAL MOTORS CORP.
Fig 2: Locating ECT, IAC, MAP & TP Sensors
Courtesy of GENERAL MOTORS CORP.
Fig 3: Locating Engine Oil Pressure & Engine Oil Level Switches, & CKP Sensor A & CKP Sensor B