Power Window Motor - Front

Remove and replace the front power window motor by accessing the regulator assembly from inside the door panel on a 2007-2013 Mercedes-Benz S65 AMG.

Warnings

Tools required

Parts

• Front power window motor × 1 — Use OEM specification
• Door panel retaining clips × 1 — Replace any broken clips
• Moisture barrier (if damaged) × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect negative battery terminal and wait 5 minutes for system discharge
3. Lower window to approximately mid-position if motor is still functional
4. Gather all tools and replacement parts
5. Prepare workspace with clean towels to protect door panel components

Procedure

1. 1

   Remove door panel trim components
   Remove the door pull handle cover by prying gently with trim tool. Remove T20 Torx screws behind the cover. Remove the triangular mirror trim piece at front upper corner of door panel. Carefully pry out and disconnect the window switch assembly, noting the electrical connector orientation.
2. 2

   Remove main door panel
   Remove all perimeter T25 Torx screws securing the door panel (typically 6-8 screws). Gently pull door panel away from door frame starting at bottom, releasing the retaining clips. Lift panel upward and away from door once all clips are released. Disconnect any remaining electrical connectors including door handle cable.
3. 3

   Remove moisture barrier
   Carefully peel back the plastic moisture barrier to access the window regulator mechanism. Start from the bottom corner and work slowly to avoid tearing. If barrier is damaged, replacement is required to prevent water intrusion into door electronics.
4. 4

   Secure window glass
   Manually raise the window glass to the full up position. Secure the glass using support blocks wedged between glass and door frame, or use wide masking tape to secure glass to door frame exterior. This prevents glass from falling when regulator is disconnected.
5. 5

   Disconnect window motor electrical connector
   Locate the window motor electrical connector on the regulator assembly. Press the release tab and disconnect the connector. If connector is difficult to access, it may be necessary to partially remove regulator mounting bolts first.
6. 6

   Separate glass from regulator
   Locate the window glass mounting bolts on the regulator carrier (typically two 10mm bolts accessible through access holes in door frame). Remove these bolts to disconnect glass from regulator mechanism. Ensure glass remains securely supported.
7. 7

   Remove window regulator assembly
   Remove the T30 Torx bolts securing the window regulator to the door frame (typically 3-4 bolts). Carefully maneuver the regulator assembly with attached motor out through the door service opening. Note the routing of cables and mechanism orientation for reinstallation.
8. 8

   Remove motor from regulator
   With regulator assembly on workbench, remove the T25 Torx bolts securing the motor to the regulator mechanism (typically 3 bolts). Disconnect any linkage arms or cables connecting motor to regulator. Remove old motor and compare with replacement to verify correct part.
9. 9

   Install new motor to regulator
   Position new motor onto regulator assembly, aligning mounting holes. Connect any linkage arms or cables. Install and tighten motor mounting bolts in a cross pattern to ensure even seating. Verify motor shaft rotates freely and engages regulator mechanism properly.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
10. 10

    Reinstall regulator assembly
    Carefully maneuver the regulator assembly with new motor through the door service opening. Position regulator against door frame mounting points. Install regulator mounting bolts finger-tight initially, then torque to specification in a cross pattern. Reconnect the window motor electrical connector.
11. 11

    Reconnect window glass
    Align window glass carrier with regulator mounting points. Install glass mounting bolts and tighten securely. Remove window support blocks or tape. Reconnect battery temporarily to test motor operation before completing reassembly.
12. 12

    Test window operation
    With battery reconnected, test window operation through full range of motion. Verify smooth operation without binding or unusual noise. Test auto-up and auto-down functions if equipped. Check window alignment in door frame. If operation is not smooth, check regulator mounting and glass alignment.
13. 13

    Reinstall moisture barrier and door panel
    Disconnect battery again. Press moisture barrier back into place, ensuring complete seal around perimeter. Reconnect all electrical connectors to door panel. Position door panel over door frame, engage top edge first, then press firmly around perimeter to seat retaining clips. Install all T25 Torx screws. Reinstall window switch assembly, mirror trim, and door pull handle cover with T20 screws.
14. 14

    Final battery reconnection and programming
    Reconnect negative battery terminal and torque to specification. Perform window initialization procedure: with ignition on, fully lower window and hold switch for 2 seconds, then fully raise window and hold switch for 2 seconds. This reprograms auto-up/down limits.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Ensure all door panel clips are properly seated to prevent rattles
2. Verify moisture barrier is completely sealed to protect electronics
3. Double-check all electrical connectors are fully engaged
4. Test all door panel switches and functions before considering job complete

Verification

• Window operates smoothly through full range of motion without binding or hesitation
• Auto-up and auto-down functions work properly and stop at correct positions
• Window seals properly against weather stripping when fully closed
• No unusual noises during window operation
• All door panel components are secure with no rattles
• Window switch controls all functions normally

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