TSB's

Caddy Seat Massage

Some owners of a 2016-2018 Cadillac XTS may comment that a vibration is felt in the seat under heavy acceleration around 20 mph. The condition may be caused by a second-order vibration (driveline shudder) from the cardan joint.

1. Raise the vehicle on a lift.

2. Remove one of the front differential mount bolts.

3. Loosen the opposite side front differential mount bolt.

4. Position the specified flat washer over the differential mount washer (see below for washer P/N)..

5. Loosely install the bolt enough to support the differential.

6. Remove the other front differential bolt and position a flat washer over the differential mount washer.

7. Install the bolt.

8. Tighten both bolts to the specification listed in the service manual.

The 14 x 42.5 x 3.61mm flat washers are available as P/N 11562546.

Note the locations of the differential mounts.
<p>Note the locations of the differential mounts.</p>

Differential mount bolts. Do not remove both at the same time. Remove one, install a washer, install that bolt, then remove the other bolt, install the washer, then torque both bolts to spec.
<p>Differential mount bolts. Do not remove both at the same time. Remove one, install a washer, install that bolt, then remove the other bolt, install the washer, then torque both bolts to spec.</p>

Note the location of the new additional flat washer (1) and the existing mount washer (2).
<p>Note the location of the new additional flat washer (1) and the existing&nbsp; mount washer (2).</p>

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