Door Check/Stop

Replace or service the door check/stop mechanism that controls door opening resistance and holds the door in the open position on a 2009 Aston Martin DB9.

Warnings

Tools required

Parts

• Door check/stop assembly × 1 — Use OEM specification
• Door panel trim clips (if damaged) × 1 — Use OEM specification

Preparation

1. Park vehicle on level ground and engage parking brake
2. Open the door to be serviced and ensure it is stable
3. Protect adjacent body panels with painter's tape or soft cloth to prevent contact damage
4. Have an assistant available to support the door weight during check removal if working alone

Procedure

1. 1

   Remove door interior trim panel lower section
   Locate and remove the Torx fasteners securing the lower door trim panel. On the DB9, remove the Torx fasteners along the bottom edge and pull handle/armrest area accessible from the interior (count per OEM documentation). Use plastic pry tools to carefully release the trim clips around the perimeter after fasteners are removed. Work from bottom to top, being mindful of the connection points. Note: On the DB9, remove the trim panel retaining fasteners located along the bottom edge and pull handle/armrest area (verify exact count and locations against the DB9 workshop manual). Note: On the DB9, remove the fasteners securing the lower door trim panel (exact count and locations per OEM documentation; check for concealed fasteners behind the pull handle/armrest and door release surround).
2. 2

   Disconnect door trim electrical connectors
   Locate the electrical connectors for the door-mounted switches and controls (such as window and door release/lock controls) integrated into the door panel. Press the locking tabs and disconnect each connector. Support the trim panel as you work to avoid strain on remaining connections. Note: Locate the electrical connectors for window switches, door lock controls, mirror controls, and any courtesy/puddle lighting integrated into the door panel.
3. 3

   Access door check mounting area
   With the lower trim removed, locate the door check assembly mounted between the door shell and the A-pillar/body. The check is typically visible near the door hinge area. Use a work light to inspect the mounting configuration and identify all fasteners. Note: With the lower trim removed, locate the door check assembly mounted between the door shell and the A-pillar/body structure (verify exact anchor location per OEM documentation).
4. 4

   Mark door check position
   Before removal, use a paint marker or scribe to mark the exact position of the door check mounting bracket relative to both the door and body mounting points. This ensures proper alignment during reinstallation and maintains correct door operation.
5. 5

   Support door weight
   Open the door to approximately 45 degrees. Place a padded jack stand, blocks, or have an assistant support the door weight. The door check provides structural support when engaged, so the door must be independently supported before removal.
6. 6

   Remove door check body-side fasteners
   Locate the fasteners/pin securing the door check to the A-pillar body structure (verify exact count and fastener type against DB9 workshop manual). Remove these fasteners completely and retain them if reusing. Note: Locate the fastener(s) securing the door check to the B-pillar or body structure (count and Torx size per OEM documentation). Remove and retain if reusing. Note: Locate the Torx fasteners securing the door check to the A-pillar/body structure (count and size per OEM documentation; commonly T30). Remove these fasteners completely and retain them if reusing.
7. 7

   Remove door check door-side fasteners
   Locate the fasteners securing the door check mounting bracket to the door shell structure (verify exact count and fastener type against DB9 workshop manual). Remove these fasteners and carefully extract the door check assembly. Note the orientation and routing of the check mechanism for reinstallation. Note: Locate the Torx fasteners securing the door check mounting bracket to the door shell structure (count per OEM documentation).
8. 8

   Inspect mounting points and clean surfaces
   Examine both the door and body mounting surfaces for damage, corrosion, or wear. Clean the mounting surfaces with a wire brush or solvent if necessary. Inspect the fastener threads in the door and body structure for damage. Check door hinge condition while access is available.
9. 9

   Install new door check assembly
   Position the new or serviced door check assembly aligning with the reference marks made during removal. Start the door-side fasteners first, threading them by hand but leaving them loose. Then align and start the body-side fasteners by hand.
10. 10

    Torque door check fasteners
    Torque the door check mounting fasteners to the OEM-specified value (verify in factory documentation) in a cross pattern. Begin with the body-side fasteners, then torque the door-side fasteners. Verify the check mechanism operates smoothly through its full range of motion. Note: Torque the door check mounting fasteners to the DB9 workshop-manual specification (verify exact value) in a cross pattern. Begin with the body-side fasteners, then torque the door-side fasteners. Note: Torque the door check mounting fasteners to the Aston Martin OEM specification (value to be confirmed from official service documentation; do not assume a generic body-panel value on the aluminum structure). Torque the body-side fasteners first, then the door-side fasteners, and verify the check mechanism operates smoothly through its full range of motion.
    Torque spec

    Body Panel Bolts25 Nm (18 lb-ft)
11. 11

    Test door check operation
    Remove door support and carefully test the door operation. The door should open smoothly with distinct detent positions where the check engages. Verify the door holds securely at each check position and closes smoothly without binding. Adjust mounting position slightly if necessary to achieve proper operation.
12. 12

    Reinstall door trim panel
    Reconnect all electrical connectors for switches and controls. Position the door trim panel, ensuring all alignment pins and clips are properly located. Press firmly around the perimeter to engage the trim clips. Reinstall all Torx fasteners and torque appropriately. Verify all switches and controls function correctly.

Reassembly

1. Ensure all electrical connectors are fully seated with locking tabs engaged
2. Verify door trim panel is flush and all clips are properly engaged before closing door
3. Test door lock, window, and all integrated switch functions before completing the job

Verification

• Open and close the door multiple times, verifying smooth operation without binding or unusual noise
• Confirm the door check holds the door securely at each detent position
• Verify the door closes fully and latches properly without requiring excessive force
• Check that door alignment with body panels remains correct and consistent with pre-service condition
• Test all door-mounted electrical functions (windows, locks, switches) for proper operation

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