Product Description:
Hawks Motorsports is pleased to offer our clients the following.
This used original GM center high-mounted stop lamp assembly is intended for compatible 1991-1992 Chevrolet Camaro and Pontiac Firebird liftback models.
Mounted inside the vehicle along the upper edge of the rear hatch glass, the assembly provides the elevated third brake light required for the applicable late third-generation F-Body design. It can replace an assembly that is missing, cracked, faded, modified or otherwise unsuitable for continued use.
This product is commonly described as the:
- Third brake light
- High-mount stop lamp
- Center high-mounted stop lamp
- CHMSL assembly
- Upper hatch brake light
- Rear hatch third brake lamp
This is a used electrical and interior-trim component. Review the current product photographs for its exact condition, color, connector configuration and included pieces.
Key Features
| Feature | Product specification |
|---|---|
| Producer | General Motors |
| Product type | Center high-mounted stop lamp assembly |
| Common abbreviation | CHMSL |
| Model years | 1991-1992 |
| Vehicle platform | Third-generation GM F-Body |
| Installation location | Interior upper rear hatch |
| Body style | Liftback coupe |
| Condition | Used original |
| Quantity | One assembly |
| Hawks inventory number | HT91923RDHLIGHT |
This Product Includes
This listing includes the used third brake light assembly and the components visibly attached in the current product photographs.
Depending on the individual assembly shown, attached components may include:
- Lamp housing
- Red brake-light lens
- Bulb socket
- Wiring lead
- Electrical connector
- Interior trim cover
Only the components visible in the product photographs should be considered included. Bulbs are used service items and are not guaranteed unless their operation is specifically confirmed in the listing.
Interior Upper-Hatch Location
For the applicable 1991-1992 liftback models, the center high-mounted stop lamp is positioned inside the vehicle at the upper edge of the rear hatch glass.
This location distinguishes the assembly from:
- Spoiler-mounted third brake lights
- Exterior hatch-mounted lamps used during other production years
- Convertible third brake lights
- Main left- and right-hand tail lamp assemblies
The assembly is not a direct substitute for a spoiler-mounted or convertible-specific third brake lamp.
Year / Model Interchange
| Years | Make | Model | Body style | Lamp location |
|---|---|---|---|---|
| 1991-1992 | Chevrolet | Camaro RS | Liftback coupe | Inside upper rear hatch |
| 1991-1992 | Chevrolet | Camaro Z28 | Liftback coupe | Inside upper rear hatch |
| 1991-1992 | Pontiac | Firebird | Liftback coupe | Inside upper rear hatch |
| 1991-1992 | Pontiac | Firebird Formula | Liftback coupe | Inside upper rear hatch |
| 1991-1992 | Pontiac | Trans Am | Liftback coupe | Inside upper rear hatch |
| 1991-1992 | Pontiac | Trans Am GTA | Liftback coupe | Inside upper rear hatch |
Important Application Notes
- Intended for compatible 1991-1992 liftback coupes
- Mounts inside the vehicle at the upper edge of the rear hatch
- Does not fit convertible models
- Does not replace a spoiler-mounted third brake light
- Does not replace earlier exterior-mounted hatch lamps
- Interior housing color and trim details should be matched before ordering
- Connector and attachment-point configuration must match the vehicle
- Included components are determined by the current product photographs
- Bulb operation should be checked before installation
Convertible models use a different third brake light arrangement. Do not order this interior hatch-mounted assembly for a Camaro or Firebird convertible based solely on model year.
Used Original GM Condition
This is a previously installed original GM assembly. It is not a newly manufactured reproduction, restored component or New Old Stock part.
Normal used-part condition may include:
- Scratches and scuffs
- Fading or discoloration
- Dust or residue
- Minor lens wear
- Marks around attachment locations
- Age-related plastic brittleness
- Worn or discolored wiring
- Previous installation evidence
- Minor cosmetic imperfections
Review every available photograph carefully. Pay particular attention to the housing, lens, mounting locations, bulb socket, wiring lead and electrical connector.
Used plastic trim components should be handled carefully because age and heat exposure can make original attachment points brittle.
Lens Condition
Inspect the photographs for scratches, fading, cracking, heat damage or other imperfections in the red lens.
A separate reproduction lens may be available under part number HT91923RDLNS when the original housing is usable but its lens requires replacement. The replacement lens is not automatically included with this used assembly.
Electrical Condition
Unless the listing specifically states that the assembly has been tested, electrical operation should be confirmed before final installation.
A non-operating third brake light can be caused by several items other than the housing itself, including:
- Failed bulb
- Corroded bulb socket
- Damaged wiring
- Loose electrical connector
- Poor ground
- Brake-light switch problem
- Vehicle-side circuit fault
Inspect and test the lamp circuit before assuming that the used assembly is responsible for an electrical problem.
Color and Interior Matching
The visible housing or trim-cover color can vary according to the donor vehicle and available inventory.
Compare the product photographs with the vehicle’s headliner, upper hatch trim and original lamp assembly when an exact color match is required. Fading and differences in lighting or screen settings can affect apparent color.
An original used housing may require cleaning or refinishing to match a restored interior.
Installation Information
Before installation:
- Disconnect the vehicle battery
- Remove the surrounding upper-hatch trim carefully
- Support the original lamp assembly during removal
- Disconnect the electrical connector without pulling on the wires
- Compare the replacement assembly with the original
- Confirm the housing shape and mounting locations
- Check the connector and wiring configuration
- Inspect the bulb socket for corrosion or heat damage
- Test the bulb and lamp circuit
- Position the assembly without pinching the wiring
- Reinstall the surrounding trim carefully
- Reconnect the battery
- Verify that the lamp illuminates when the brake pedal is pressed
- Confirm that the lamp switches off when the pedal is released
Have another person observe the light from behind the vehicle while testing it. A third brake light that does not illuminate correctly should be diagnosed before the vehicle is driven.
Avoid overtightening fasteners against aged plastic attachment points.
PART NUMBER
HT91923RDHLIGHT
FREQUENTLY ASKED QUESTIONS
What is included?
The listing includes the used third brake light assembly and the components visibly attached in the current product photographs.
Is this an original GM component?
Yes. This is a used original GM assembly rather than a newly manufactured reproduction.
Where does this brake light install?
It mounts inside the vehicle along the upper edge of the rear hatch glass.
What does CHMSL mean?
CHMSL stands for center high-mounted stop lamp, the formal term for the third brake light.
Does it fit a 1991 Camaro RS?
Yes. It is intended for compatible 1991 Camaro RS liftback coupes using the interior upper-hatch lamp.
Does it fit a 1992 Camaro Z28?
Yes. It is intended for compatible 1992 Camaro Z28 liftback coupes using this lamp configuration.
Does it fit a 1991 Firebird Formula?
Yes. It fits compatible 1991 Firebird Formula liftback coupes with the interior upper-hatch lamp.
Does it fit a Trans Am or GTA?
Yes. It is intended for compatible 1991-1992 Trans Am and Trans Am GTA liftback models.
Does it fit a convertible?
No. Convertible models use a different third brake light arrangement.
Does it fit earlier third-generation models?
This listing is identified specifically for the 1991-1992 interior upper-hatch application. Earlier vehicles can use different lamp locations and assemblies.
Is this a spoiler-mounted brake light?
No. This assembly mounts inside the vehicle near the upper edge of the rear hatch glass.
Is the red lens included?
The lens is included only when it is attached to the assembly shown in the current product photographs.
Is the bulb included?
A used bulb may remain installed, but bulb presence or operation is not guaranteed unless specifically confirmed.
Is the wiring connector included?
Any wiring lead or connector shown attached in the current photographs is included. Compare it with the vehicle-side connection before ordering.
Has the light been tested?
Do not assume tested operation unless the individual product listing specifically confirms it. The assembly and vehicle circuit should be tested during installation.
Will the housing color match my interior?
Interior color is not guaranteed. Compare the current photographs with the vehicle’s trim before ordering.
Is the pictured assembly the item I will receive?
The current photographs represent the used assembly offered by the listing. Review them carefully for condition and included components.
Is a new replacement lens available?
A separate reproduction 1991-1992 third brake light lens may be available under part number HT91923RDLNS.
