Removal Procedure

WARNING: This page is about a different car, the 2018 Cadillac XTS. However, it is still accessible from the selected car via links, so may be relevant.

Raise and support the vehicle. Lifting and Jacking the Vehicle
Deflate the suspension air bags. Air Suspension System Depressurization and Pressurization
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Remove the rear wheelhouse liner (4). Rear Wheelhouse Liner Replacement
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Disconnect the ABS sensor and control module electrical connectors (1) from the body side wiring harness (2).
If equipped with integrated braking assist, disconnect the electrical connector (3).
Separate the wiring harness from the body.
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Disconnect the strut electrical connector (2) and separate the wiring harness from the body.
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Remove the bolts (1) that secure the brake caliper to the caliper bracket.
Secure the brake caliper to the body using mechanics wire or equivalent.
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Remove the ABS sensor (1).
Separate the ABS wiring harness from the upper control arm.
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Disconnect the air ride pump electrical connector (1).
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Support the rear cradle assembly with a support stand (1) or equivalent.
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Remove the two left side cradle reinforcement bracket bolts (4).
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Remove the two left side cradle bolts (2) and the support reinforcement (3).

Remove the remaining left side rear cradle bolt.
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Remove the two upper strut bolts (1).
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Disconnect the ride height sensor electrical connector (3).
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WARNING:
The hydraulic pressure in the differential clutch is very high. To prevent personal injury, wait for at least 10 minutes before removing any parts from the differential clutch.

Using care, lower the cradle assembly so that only the left side is lowered enough to gain access to remove the rear differential clutch control module screws (1).
Remove the rear differential clutch control module screws (1) and the rear differential clutch control module.
Fig 1: Exploded View Of Rear Differential Clutch Control Module Components
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Disconnect the module electrical connectors.
Remove the wiring harness from the suspension cradle.
Remove and discard the module to differential seal (3).
Using care, remove the solenoid (2) and seal (1).