This manual provides comprehensive electrical system wiring diagrams for the 1999 models, built on the P80 platform. These vehicles are known for enduring commitment to safety and functional design, offering a range of body styles including the coupe and convertible, the sedan, and the wagon. The models typically feature 2.0L, 2.4L, and 2.5L turbocharged inline-five cylinder engines, coupled with either manual or the electronically controlled automatic transmission. This documentation is essential for understanding the intricate electrical architecture that supports features from engine management and climate control to advanced safety systems like SRS airbags and ABS. The purpose of this manual is to serve as an indispensable resource for enthusiasts, DIY mechanics, and professional technicians. It details the electrical wiring for a vast array of systems, including engine management, lighting, power windows and seats, climate control, anti-theft systems, and the Roll Over Protection System for convertible models. By offering factory-accurate diagrams, component locations, and pinout information, this manual facilitates efficient troubleshooting and repair of electrical faults, ensuring the optimal performance and longevity of your 1999 models.