Standard Ignition HLS-1256 Headlight Switch

Headlight Switch for Select GM Applications

The Standard Ignition HLS-1256 headlight switch is built for direct replacement in select Chevrolet, GMC, Buick, Isuzu, and Oldsmobile vehicles. It is engineered with copper alloy conductors for strong electrical conductivity and low resistive loss, helping restore reliable headlight control in the cabin.

With a 12-volt design, 4 switch positions, and a direct snap-fit attachment method, this HLS-1256 replacement is made for service work where consistent mechanical and electrical switching performance matters.

Key Features

• Direct, snap-fit headlight switch replacement
• 12-volt electrical design
• 4 switch positions for headlight control
• Black plastic finish
• Female and male connector configuration
• 2 connectors with rectangular shape
• 15 blade terminals with male terminal gender
• Copper alloy conductors for improved electrical conductivity
• 100% tested for mechanical and electrical switching performance

Detailed Description

Standard Ignition HLS-1256 is a headlight switch designed for vehicles that require dependable interior lighting control and stable electrical operation. The switch uses copper alloy conductors to reduce resistive losses and support consistent current flow, while the robust construction and plastic finish are suited to everyday service replacement needs. This part number HLS-1256 is a direct-fit option for select applications, including 2003-2009 Chevrolet Trailblazer, 2007-2009 GMC Envoy, and 2004-2007 Buick Rainier configurations listed with headlight washers, fog lights, and export or DRL/OFF mode notes where applicable.

This part cross-references Spectra Premium S10123 for the same application.

Vehicle Fitment

• Fits 2003-2009 Chevrolet Trailblazer, N/A, w/ Headlight Washers; w/ Fog Lights; Export
• Fits 2007-2009 GMC Envoy, N/A, w/ Front Fog Lights; Export
• Fits 2004-2007 Buick Rainier, N/A, w/ Headlight Washers; w/ Fog Lights
• Fits 2003-2007 Isuzu Ascender, N/A, w/ Headlight Washers; w/ Fog Lights
• Fits 2003-2006 Chevrolet Trailblazer EXT, N/A, w/ Headlight Washers; w/ Fog Lights; Export
• Fits 2004-2005 GMC Envoy XUV, N/A, w/ Headlight Washers; w/ Fog Lights; w/ DRL/OFF Mode
• Fits 2003-2004 Oldsmobile Bravada, N/A, w/ Headlight Washers; w/ Fog Lights

Installation Notes and Tips

Verify the connector style, terminal count, and switch position layout before installation. This HLS-1256 uses a direct, snap-fit attachment method and rectangular connectors, so matching the original switch configuration is important for proper operation. Confirm the vehicle’s equipment notes, including fog lights, headlight washers, export specification, or DRL/OFF mode, before ordering.

Quality Assurance

Standard Ignition states that this switch is 100% tested for both mechanical and electrical switching performance. The design also reflects the brand’s focus on service-professional durability and electrical reliability.