The Z3 M Roadster and Z3 M Coupe, produced in 1999, represent the pinnacle of performance and driving engagement within the Z3 lineup. These compact sports cars, built on the robust E36 platform and manufactured in Spartanburg, South Carolina, are distinguished by their powerful inline 6-cylinder engines, available in 3.2-liter (S50B32) or 3.2-liter (S52B32) configurations, delivering impressive horsepower and torque. The Z3 M Roadster offers the classic open-top driving experience, while the Z3 M Coupe is renowned for its unique and highly collectible shooting-brake styling. Both models feature a 5-speed manual transmission, limited-slip differential, and advanced suspension systems, embodying M GmbH heritage of precision engineering and thrilling performance, making them a favorite among driving enthusiasts. This Electrical Troubleshooting Manual (ETM) is specifically designed to provide comprehensive guidance for the 1999 Z3 M Roadster and Z3 M Coupe. It focuses exclusively on the intricate electrical systems of these vehicles, offering detailed diagnostic procedures, systematic troubleshooting trees, and component-level wiring diagrams. The manual covers a wide array of systems, including powertrain management, chassis electronics, body electricals, comfort and infotainment systems, and safety features like airbags. By detailing fuse and relay assignments, component locations, diagnostic test points, and connector information, this resource empowers owners, mechanics, and technicians to effectively identify and resolve electrical issues, ensuring the optimal performance and reliability of their Z3 M models.