Standard Ignition DS-338 Headlight Dimmer Switch

Headlight Dimmer Switch for GM Column-Mount Applications

The Standard Ignition DS-338 is a column-mounted headlight dimmer switch built for 12-volt electrical systems. It uses a bolt-on attachment method, male terminals, and wire lead/pin connections to support reliable headlight beam selection in select Chevrolet, Buick, Oldsmobile, and Pontiac vehicles.

Compatible With 1988-1994 Chevrolet Lumina, 1988-1993 Buick Regal, 1989-1993 Oldsmobile Cutlass Supreme, 1988-1993 Pontiac Grand Prix, 1988-1990 Pontiac Tempest, and 1988-1989 Pontiac 6000 with no radio controls on the steering wheel.

• Part number DS-338 for select GM column-mounted dimmer switch applications
• Bolt-on mounting location for column installation
• 12-volt electrical design
• 4-terminal layout with male terminals
• Wire lead and pin terminal type for service replacement use
• Copper alloy conductors for strong electrical conductivity and reduced resistance

Detailed Product Overview

Standard Ignition DS-338 is engineered as a direct replacement headlight dimmer switch for vehicles that use a column-mounted control. The switch is built with durable materials and copper alloy conductors to help maintain consistent electrical transfer during headlight beam changes. It is 100% tested for mechanical and electrical switching performance before release. This part number DS-338 is a practical service solution for restoring dimmer switch function on applications such as Chevrolet Lumina, Buick Regal, and Pontiac Grand Prix.

This part cross-references 1S4845 and DS143 for the same application.

Common Problems This Switch Can Address

• Headlights stuck on high beam or low beam
• Intermittent beam switching at the column control
• Delayed or inconsistent dimmer response
• Electrical contact wear inside the original switch
• Loss of headlight beam control in select GM vehicles

Installation Notes and Tips

Verify the vehicle uses a column-mounted dimmer switch with a 12-volt system before installation. Confirm terminal style, terminal count, and mounting method against the original part to ensure proper replacement. For 1988-1989 Pontiac 6000 applications, this listing applies to vehicles without radio controls on the steering wheel. Always compare the original connector and switch layout to the DS-338 before service.

Quality Assurance

Standard Ignition states that this switch is built with robust materials, copper alloy conductors, and full mechanical and electrical testing to support dependable service performance.