The following wiring diagram and electrical system schematics apply for Volkswagen GTI 16V 1987 and 1988 model years. The electrical discussed herein covers detail description of each electrical components including relay panel, fuse panel, main wiring diagram, cold start system, power supply circuit, electronic engine controls, emergency flasher, central locking system, ground locations, fuel pump system, horns, windshield wipers, exterior lights, interior lights, instrument panel lights, instrument cluster, air conditioning, radio, cruise control, etc.
The schematics and wiring diagram in this manual are called “current flow diagram” (as shown by the above pictures), by showing how electrical current flows through electrical components that work together in circuits, troubleshooting is much easier with these schematics.
Find more information about Volkswagen GTI 16V wiring diagram and electrical system schematics here. (source: gti16v.com)