Keystone GM1550111 Rear Left Power Window Regulator Without Motor

The Keystone GM1550111 is an OEM-replacement rear left (driver side) power window regulator designed for the 2003–2007 Cadillac CTS and CTS-V sedan. This regulator is sold without motor, making it the ideal solution when the mechanical regulator assembly has failed but the existing motor remains serviceable.

The window regulator is the mechanical framework housed inside the door panel that guides and moves the window glass up and down when the power window switch is activated. Over time, regulators can fail due to worn cables, broken clips, or damaged tracks — resulting in windows that move slowly, operate erratically, or fail to stay in position. Replacing the regulator assembly restores smooth, reliable power window operation.

Key Features:

• Direct OEM-style replacement for the rear left (driver side) window regulator
• Power window design — motor not included
• Replaces OEM part number 15277680 and cross-references 15277680-PFM
• Also cross-references aftermarket part numbers: 740-064
• Sold individually
• Engineered to match original equipment fit, form, and function

This regulator installs inside the rear driver-side door panel of applicable Cadillac CTS and CTS-V models. Access requires removal of the interior door panel trim before the assembly can be reached and replaced.