1991 Audi 90 electrical wiring diagram is provided in this following site. It consists of many pdf files containing circuit diagram of the vehicle system. These circuit diagrams will help the technician or vehicle owner to perform troubleshooting to deal with electrical problem or connection problem between the vehicle components and electrical parts. The files are in pdf. The diagrams system discussed are as follows :

Power Seat System
Power Mirror/Window/Sunroof, Taillights
Engine Compartment & Headlights
EFI Control Unit, Computer Engine Control
Anti-Lock Brake System, A/C & Heater
A/T Control Unit, Trans Solenoid, Gear Selector Switch
Ignition Switch, Airbag
Combination Switch, Fog Lights
Fuse/Relay Panel , Auxiliary Relay, Sunroof
O/B Computer Control Switch, Radio
Instrument Cluster, Anti-Theft, Seat Belt

For more information and details about the wiring diagram of the vehicle, you can download the pdf files from the following source (password : autoobuzz.com) :

1991 AUDI 90 ELECTRICAL SYSTEM CIRCUIT SCHEMATIC DOWNLOAD

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