Standard Ignition US-939 Ignition Switch

Reliable Ignition Switch for BMW 528i and 540i

The Standard Ignition US-939 ignition switch is designed specifically for BMW 528i and 540i models. Engineered to provide consistent performance, this ignition switch features a durable black plastic finish and a snap fit attachment method for straightforward installation.

Key Features of Standard Ignition US-939

• Face color: Black for a clean, OEM appearance
• Attachment method: Snap fit for secure mounting
• Connector: Female, square shape with one connector
• Terminals: 11 male pin terminals for reliable electrical connections
• Mounting location: Column-mounted for direct compatibility
• Finish: Durable plastic construction

Detailed Product Description

The Standard Ignition US-939 ignition switch is a column-mounted component designed to replace the original ignition switch in BMW 528i and 540i vehicles. Its black plastic face ensures a factory-like look while the snap fit attachment method allows for easy and secure installation without additional hardware. The switch features a single female square connector and 11 male pin terminals, providing a stable and precise electrical interface. This ignition switch is engineered to meet the electrical and mechanical specifications required by BMW, ensuring proper function of the ignition system.

Common Applications and Issues Addressed

• Resolves ignition switch failure causing intermittent starting problems
• Replaces worn or damaged ignition switches affecting electrical connectivity
• Fixes issues with ignition key recognition and turning resistance
• Addresses electrical faults leading to dashboard warning lights
• Restores proper ignition system operation in BMW 528i and 540i models

Installation Notes and Tips

• Ensure vehicle battery is disconnected before installation to prevent electrical shorts
• Use the snap fit attachment method to secure the switch firmly in the steering column
• Verify connector orientation; the female square connector should align with the vehicle wiring harness
• Check all 11 male pin terminals for proper contact and no corrosion
• Test ignition switch function before reassembling the steering column covers

Quality Assurance and Warranty

Standard Ignition parts are manufactured to meet or exceed OEM standards for fit, form, and function. The US-939 ignition switch undergoes rigorous quality control to ensure durability and reliable performance in BMW 528i and 540i vehicles. This part is backed by Standard Ignition's limited warranty against defects in material and workmanship, providing confidence in your replacement component.