Solved! Right Rear Vibration Noise

[DrMitoFit]

I cured the annoying metallic vibration noise coming from the right rear (passenger side) of my 2021 Corsair Standard. It was due to TWO different sources, the right rear bumper marker light AND the right rear cargo area amplifier/bracket. I have the amplifier and subwoofer as standard equipment.

The right rear bumper marker light has an internal metal reflector which is not braced well in the housing. Note: I am NOT talking about the tailgate-mounted tail light. I could replicate the noise by pounding on the outer portion of the right rear bumper or marker light itself. There is a YouTube video on how to remove the rear bumper. I ordered a replacement marker light, but it rattles too! The left marker light does not rattle. Because the marker light assembly is a glued and sealed unit, I couldn't open the plastic assembly to affix the loose reflector. Instead I drilled a 1/4" hole in the black internal-facing lateral portion of the assembly and dripped some clear caulk at the curved top inside seam where the reflector touches the interior of the housing. This immediately deadened the metalic vibration sound when tapped. But because there is not a lot of air flow inside there, it could take several days for the caulk to cure. I then taped over the small hole and reassembled. Test drive was better, but I could still hear a secondary faint metallic vibration sound coming from elsewhere.

The amplifier/bracket vibration sound can be replicated by slamming the right rear door shut. I could hear it outside the car's right rear quarter panel but much more from the right rear cargo area. I removed the spare tire and cargo well liner and peeled back the rear of the right rear interior quarter panel trim. Tapping on the amplifier and its bracket replicated the sproingy metallic vibration sound. The weight of the amp and the design of the bracket make it resonate like a tuning fork. The wiring harness' rubber grommet mount was not inserted into slot at the bottom of the bracket. I removed the amp attached to it's 3 bolt bracket and unplugged grey and brown amplifier connectors, loosened the 4 bolts attaching the amp to the bracket, slid a piece of foam between the amp and it's bracket, reinstalled, and remounted the wiring harness rubber grommet back into the oval slot at the bottom of the bracket (probably helps dampen vibration). Test drive resulted in total elimination of the annoying rear sounds when driving over rippled roads for the first time ever! I can slam any door and the car has a quality sound without vibration noise for the first time.

I searched this forum and read about these annoying sounds, but I don't think anyone has corrected these two sources of vibration noise. Hope this helps.

 

[DrMitoFit]

I have a 2021 Corsair Standard with metallic vibration noises coming from the right rear when driving over rippled road surfaces or slamming the right rear door shut. It was coming from TWO different sources, but I fixed both. It looks like I may have deleted my first post while editing (or someone else deleted or moved it), so I am reposting.

Right rear bumper marker light has an internal metal reflector that is loose from the factory, replicate sound by pounding it or the right rear bumper. I am NOT talking about the tailgate mounted tail light. Solved by drilling a 1/4" hole in the black interior face of the marker light housing and dripping some caulk onto the interior of the light housing at the upper curved seam where the reflector makes contact with the housing. Worked great!

Amplifier and its bracket vibrate like a tuning fork behind the right rear quarter panel interior trim. Replicated by slamming the rear rear door shut. The amplifier's wiring harness has a rubber mounting grommet that must have fallen out of its slot at the bottom of the bracket. I removed the amplifier with its bracket and inserted a piece of foam between the amplifier and bracket (eliminating the "tuning fork" resonance) and plugged the wiring harness' rubber grommet back into it's slot at the bottom of the bracket (which also helps deaden vibration).

Now my Lincoln Corsair has a quality sound when shutting the doors and drives without the annoying metalic vibrations for the first time ever!

 

[DrMitoFit]

This is what the amplifier and its bracket look like when seen tucked behind the right rear interior quarter panel trim. It makes a metallic vibration sound unless sound deadening is applied. The amplifier itself is an aluminum block with cooling fins and a pair of color-coded electrical connectors. Note the bottom oval slot to attach the wiring harness rubber grommet.

 

[DrMitoFit]

Here’s the video of how to remove the rear bumper and access the defective right rear bumper marker light. (Not me in the video).

______________________________

Help support this site so it can continue supporting you!

 

[DrMitoFit]

This video demonstrates an overheating Lincoln stereo system that cuts out, solved by applying new thermal tape between the disassembled amplifier circuit board and its aluminum housing, for less than $10 in materials. A replacement amplifier could cost $600!