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Noise Diagnosis - Rear Suspension

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools 

CH-39570  Chassis Ear

For equivalent regional tools, refer to Special Tools .

Step Action Yes No
DEFINITION: Any noise emitted from the rear of the vehicle that is induced by VEHICLE SPEED or DRIVING TERRAIN as related to the rear suspension.
1 Did you review the General Description and perform the necessary inspections? Go to Step 2  Go to Symptoms - Suspension General Diagnosis 
2 Attempt to duplicate the condition. Road test the vehicle.
Did you duplicate the condition?		 Go to Step 3  System OK
3 Is the noise reactive to vehicle load or speed? Go to Step 4  Go to Step 6 
4 Perform the following inspections:
Did you find and correct the condition?		 Go to Step 10  Go to Step 5 
5 Inspect the rear wheel bearings. Refer to Wheel Bearings Diagnosis .
Did you find and correct the condition?		 Go to Step 10  Go to Step 6 
6 Bounce the rear of the vehicle in order to duplicate the noise.
Did you duplicate the noise?		 Go to Step 7  Go to Step 9 
7
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Inspect the rear suspension components for looseness. Refer to Fastener Specifications .
  3. Inspect the rear suspension components for damage and repair as necessary.
Did you find and correct the condition?		 Go to Step 10  Go to Step 8 
8 Inspect the rear shock absorber. Refer to Suspension Strut and Shock Absorber Testing - On Vehicle .
Did you find and correct the condition?		 Go to Step 10  Go to Step 9 
9
  1. Bounce the rear of the vehicle in order to locate the source of the noise, preferably by using the CH-39570  chassis ear or equivalent.
  2. If necessary, road test the vehicle.
  3. Repair or replace any defect component as necessary.
Did you find and correct the condition?		 Go to Step 10  System OK
10 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 3 
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