Download 1990 BMW 325 iX Electrical Troubleshooting Manual – 1990 BMW 325iX wiring diagrams, electrical troubleshooting manual, presented electrical wiring diagrams for 1990 BMW 325 iX The purpose of this manual is to show electrical schematics in a manner that makes electrical troubleshooting easier. Electrical components which work together are shown together on one schematic. The Wiper-Washer schematic, for example, shows all of the electrical components in one diagram. At the top of the page is the fuse (positive) that powers the circuit The flow of current is shown through all wires, connectors, switches, and motors to ground (negative) at the bottom of the page. Within the schematic, all switches and sensors are shown “at rest,” as though the Ignition Switch were off. For identification, component names are underlined and placed next to or above each component. Notes are included, describing how switches and other components work.