Standard Ignition DS-549 Headlight Dimmer Switch

Headlight Dimmer Switch for Nissan 240SX

Restore reliable lighting control with this Standard Ignition headlight dimmer switch, part number DS-549. It is a new, 12-volt combination switch built with a black plastic finish, a bolt-on attachment method, and a rectangular female connector layout for direct replacement service.

Compatible with Nissan 240SX models from 1989-1994, this DS-549 switch covers headlight, dimmer, and turn signal functions for vehicles without cruise control in the listed applications. It is a practical OE-style replacement for drivers addressing worn or intermittent column switch operation on the Nissan 240SX.

Key Features

• Standard Ignition DS-549 headlight dimmer switch
• Combination switch design with headlight, dimmer, and turn signal control
• 12-volt electrical specification
• Bolt-on attachment method for replacement installation
• Black plastic finish with displayed indicator markings
• Includes latching high beam operator, main light operator, momentary high beam flasher, and turn signal control
• Female rectangular connector design with 2 connector cavities and 15 blade terminals
• New replacement part

Detailed Description

The Standard Ignition DS-549 is a headlight dimmer switch designed as a combination switch for the steering column. It manages the main lighting functions, high-beam flash, latching high beam operation, and turn signal signaling in one replacement unit. This part cross-references Standard Ignition S2154 for the same application.

For Nissan 240SX service, this switch is listed for 1989-1994 models, including 1989-1990 Nissan 240SX without cruise control and 1991-1994 Nissan 240SX applications noted as headlight, dimmer, and turn signal switch replacements. The DS-549 part number is also commonly searched as a direct replacement reference for these vehicles.

What It Helps Fix

• Inoperative or inconsistent headlight dimmer switching
• High beams that do not latch or flash correctly
• Turn signal control problems at the steering column
• Worn switch contacts causing intermittent lighting response
• Replacement needs for aging Nissan 240SX column switch assemblies

Installation Notes and Tips

Verify connector shape, terminal count, and vehicle equipment before installation. This switch uses a bolt-on mounting style, a female connector, and blade terminals, so matching the original column switch configuration is important for proper fitment. Confirm whether the vehicle is equipped with cruise control, since the listed 1989-1990 Nissan 240SX applications are for vehicles without cruise control.

• Fits 1989-1994 Nissan 240SX, N/A, headlight, dimmer and turn signal switch
• Fits 1989-1990 Nissan 240SX, N/A, w/o cruise control; headlight, dimmer and turn signal switch
• Fits 1991-1994 Nissan 240SX, N/A, headlight, dimmer and turn signal switch

Quality Assurance

Standard Ignition supplies replacement electrical components built to match common OE service requirements. DS-549 is a new part with application-specific fitment for Nissan 240SX lighting and signal control service.