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sprinkles08, ASE Certified Technician
Category: Car
Satisfied Customers: 22981
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Cadillac SRX: 2004 Cadillac SRX with moon roof. When vehicle

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2004 Cadillac SRX with moon roof. When vehicle makes aggressive turns or hits bumps in the road a loud knock or two comes from something under the headliner towards the back of the car. It sounds like something is loose or floating around in the headliner but this knock is always in the same place. Please help.

Hello and welcome to JustAnswer!


If the noise is always coming from the same area then it's more likely to be something in place that is shifting or making a noise because of body flex and stress, rather than something moving around in the headliner.


If the noise is above the headliner then the best thing to do would be remove the headliner and start with a visual inspect. If nothing can be seen then you can have a helper drive the car while someone in the back seat listens for the noise. It could be coming from something like a loose sunroof assembly, or it could be coming from structural bracing. There are structural braces that the roof sheet metal attaches to, you may have something flexing and causing the noise because of a broken spot weld, etc. With the noise being above the headliner and happening during times of body flex it sounds like the problem is being caused by something structural.

Customer: replied 4 years ago.

Thanks for your reply, can you provide me with a diagram and procedure for removing a headliner in an SRX. Are there any special tools needed for this job?

The first thing you'll want to do is disconnect the battery.

Remove the A pillar trims, the trim panels on either side of the windshield on the inside. There may be a screw at the top behind a trim cover, if not then it will just pop off.

Remove the front grab handles.

Recline the front seats.

Remove the upper B pillar trim panels, the upper panels on the center pillar between the doors.

Lower the rear seat backs and remove the C pillar trims.

Remove the cargo hooks. There is a trim cover to flip open to expose the screws that hold the hooks.

Remove the overhead console and unplug it, set it aside.

Remove the sun visors and visor hooks.

Unplug the mirror connector.

Remove the cargo and dome lamps.

Unplug the antenna module.

Unplug the radio control module.

Disconnect the rear washer hose front the connector at the right side of the lower instrument panel.

Disconnect the washer hose at the liftgate.

Pull away the door seals at the tops where they overlap the headliner.

Unplug all electrical connectors.

Drop the headliner down onto the seats and you can look up at the roof panel for a visual inspection. If you do need to drive it to pinpoint the noise then you can remove the entire headliner through the liftgate opening.
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Customer: replied 4 years ago.

I am getting ready to try this out. I will get back with you shortly.