Take charge of your headlights and dash-light brightness with this Standard Ignition switch, part number HLS-1238. It is a headlight switch and instrument panel dimmer switch that the manufacturer calls a multi-function dash switch. It fits many vehicles, among them the 2007-2009 Chevrolet Trailblazer, 2007-2009 GMC Envoy and 2002 Chevrolet Trailblazer Ext, as a direct-fit replacement for the listed applications.
The switch turns the headlights on and off and sets how brightly the instrument panel lights glow. Because it is listed under both names, headlight switch and instrument panel dimmer switch, it is the same part either way you search for it.
Signs a headlight switch may need replacing include headlights that won't switch on or off, lights that flicker, and dash lights that won't dim or brighten. Fuses, bulbs and wiring can cause the same symptoms, so diagnose the circuit before replacing the switch. See the Buyer's Guide tab for the full list of vehicles this part fits.
Interchange: S10105 · SW3789 · HL7263 · 10372948 · 15157676 · 25932631
This part cross-references / interchanges with the following part numbers:
What does the Standard Ignition HLS-1238 do?
It is a headlight switch and instrument panel dimmer switch combined in one multi-function dash switch. It turns the headlights on and off and adjusts how brightly the instrument panel lights glow.
Is this the right Trailblazer switch for my Chevrolet?
HLS-1238 is a direct-fit replacement for the 2007-2009 Chevrolet Trailblazer and the 2002 Chevrolet Trailblazer Ext. The Buyer's Guide tab shows every listed vehicle.
Will this Envoy switch fit a 2007-2009 GMC Envoy?
Yes. The 2007-2009 GMC Envoy is one of the listed applications for HLS-1238. See the Buyer's Guide tab for the other vehicles it fits.
What are signs my headlight switch may need replacing?
Headlights that won't turn on or off, flickering lights, or dash lights that won't dim may be signs of a failing switch. Fuses, bulbs and wiring cause similar symptoms, so diagnose the circuit first.
How is the HLS-1238 built and tested?
It uses copper alloy conductors for strong conductivity with low resistive losses. Standard Ignition tests its parts 100% to verify both mechanical and electrical switching performance.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
