Steering Column

Complete removal and replacement of the steering column assembly on a 2009 Aston Martin DB9, including disconnection of electrical systems, intermediate shaft coupling, and column mounting hardware.

Warnings

Tools required

Parts

• Steering column assembly × 1 — Use OEM Aston Martin specification
• Intermediate shaft pinch bolt (if reuse not permitted) × 1 — Check OEM specification for one-time-use status
• Steering column mounting bolts (if stretch-type) × 4 — Use OEM specification

Preparation

1. Park vehicle on level surface and apply parking brake firmly
2. Turn steering wheel to center position and verify front wheels are straight
3. Turn ignition to OFF position and remove key
4. Open hood and disconnect negative battery terminal using 10mm socket. Isolate cable away from terminal
5. Wait minimum 10 minutes for airbag system capacitor discharge before proceeding
6. Remove driver's side floor mat and inspect carpet for moisture or contamination that could affect reassembly
7. Photograph steering column area from multiple angles for reassembly reference

Procedure

1. 1

   Remove steering wheel airbag module
   With battery disconnected and 10-minute wait complete, locate the airbag module access holes on the rear sides of the steering wheel. Insert the appropriate release tool into each access hole to disengage the airbag spring clips (verify exact tool type and size against the Aston Martin DB9 service manual). Carefully pull the airbag module straight toward you. Disconnect the yellow airbag connector and horn connector from the rear of the module. Place airbag module face-up in a secure location away from work area.
2. 2

   Lock steering wheel and remove steering wheel retaining nut
   Before removing steering wheel, lock it in the centered position using a wire tie or locking pliers through a wheel spoke and a fixed part of the column shroud to prevent rotation. Mark the steering wheel position relative to the steering shaft using a paint pen for alignment reference. Remove the steering wheel center retaining nut (verify exact size and type against the Aston Martin service manual).ual). In most cases the wheel can be pulled straight off the splines by hand once the bolt is removed—never strike the wheel or use excessive force, and only use a steering wheel puller if the service manual specifies one. Once loose, carefully feed the airbag/horn and any clockspring pigtail wiring through the wheel hub as you remove the wheel, verifying wiring routing against OEM documentation. Note: Remove the steering wheel center retaining nut (verify exact size and type against Aston Martin service documentation before selecting tooling). Note: Verify the OEM removal method for the steering wheel—some designs release by hand once the retaining nut is removed, while others require a dedicated puller. Never strike the wheel or use excessive force. Note: Remove the steering wheel center retaining nut (verify exact size and type against Aston Martin OEM service documentation before proceeding). Note: Verify the OEM removal method for the steering wheel—on many modern columns the wheel is removed by hand once the retaining nut is removed; use a proper steering wheel puller only if specified. Never strike the wheel or use excessive force.
3. 3

   Remove lower dashboard trim panels and knee bolster
   Remove the lower dashboard trim panel below the steering column. This typically involves Torx fasteners (T20 or T25) along the lower edge and sides. Locate and remove the knee bolster panel (the padded panel directly above the pedals and below the column). Inspect for fasteners hidden behind trim caps or under overlapping panels. Once fasteners are removed, carefully pull panels away from retaining clips. Disconnect any electrical connectors for courtesy lights or diagnostic ports.
4. 4

   Remove steering column shrouds
   Remove the upper and lower steering column shrouds (the plastic covers surrounding the column). These are typically secured with Torx screws (T20 or T25) accessible from the underside of the lower shroud. There are typically 3-4 screws. Once fasteners are removed, separate the lower shroud first, then lift the upper shroud away while feeding past the wiring for stalk switches. Be careful not to snag wiring during removal.
5. 5

   Disconnect steering column electrical connectors
   Locate all electrical connectors on the steering column: ignition switch connector, wiper/indicator stalk connectors, clockspring connector (large yellow connector), column adjustment motor connector (if equipped with power tilt/telescope), and any additional lighting or switch connectors. Photograph each connector's routing and orientation. Depress locking tabs and disconnect each connector. Label or tag connectors if multiple similar connectors are present. Inspect connector pins for damage or corrosion.
6. 6

   Remove ignition lock cylinder housing
   If replacing the complete column assembly, remove the ignition lock cylinder housing. This typically requires removing Torx security screws (T30 or T40) securing the housing to the column. Some systems require the key to be in the ACC position and a release pin to be depressed to remove the cylinder. Once fasteners are removed, separate the housing from the column shaft. Keep all fasteners organized for potential reuse with new column.
   Torque spec

   Ignition Switch Bolts10 Nm (7 lb-ft)
7. 7

   Mark and disconnect intermediate shaft
   Working in the footwell and under the dash, locate the intermediate shaft coupling that connects the steering column to the steering rack input shaft. This coupling is typically visible just above the firewall. Using a paint pen, mark the exact rotational alignment of the column shaft to the intermediate shaft coupler—this is critical for maintaining steering geometry. Remove the pinch bolt securing the column shaft to the intermediate shaft using appropriate Torx or hex socket. Once bolt is removed, carefully spread the clamp (if split-clamp design) and slide the intermediate shaft coupling down off the column shaft splines. Do NOT rotate the steering shaft or intermediate shaft from this point forward.
   Torque spec

   Pinch Bolt25 Nm (18 lb-ft)
8. 8

   Remove column adjustment mechanisms
   If the vehicle is equipped with manual tilt/telescope adjustment, locate and loosen or remove the adjustment lever and associated hardware. For power adjustable columns, verify all electrical connectors are disconnected. Identify the adjustment mechanism mounting points to the column—these may need to remain with the column or be transferred to the new assembly depending on the replacement part configuration. Consult parts diagram to confirm which components transfer.
9. 9

   Remove steering column mounting bolts
   Locate the steering column mounting bracket at the top of the column where it attaches to the dashboard support structure. There are typically 4 mounting bolts (usually Torx T40 or T45) securing the column bracket to the dash structure. Support the weight of the column with one hand or have an assistant hold it. Remove all mounting bolts while supporting column weight. Note any shims, spacers, or alignment hardware present at mounting points—these must be reinstalled in exact positions.
   Torque spec

   Steering Column Bolts25 Nm (18 lb-ft)
10. 10

    Remove steering column assembly
    With all fasteners, electrical connections, and shaft couplings disconnected, carefully maneuver the steering column assembly down and out through the footwell area. Guide the column shaft carefully past the intermediate shaft to avoid damage to shaft splines or boots. Inspect the path for any remaining wiring harnesses, brackets, or fasteners that were missed. Once clear, place the old column on a clean work surface for component transfer if required (such as switches, adjustment mechanisms, or clockspring if reusing).
11. 11

    Prepare and install new steering column assembly
    Inspect the new steering column assembly for shipping damage or missing components. Transfer any required components from the old column to the new one (clockspring, ignition switch housing, adjustment mechanisms) per parts diagram. Ensure the new column's shaft is in the centered position and matches the intermediate shaft orientation. Carefully guide the new column assembly up into position through the footwell, aligning the column shaft with the intermediate shaft splines and the mounting bracket with the dash structure mounting holes. Do not force—verify no wiring is pinched and that the shaft splines are properly aligned before pushing into place.
12. 12

    Install steering column mounting bolts
    With the column held in position (by assistant or temporary support), install all steering column mounting bracket bolts finger-tight first to ensure proper alignment. Verify any shims or spacers are in their original positions. Once all bolts are started, tighten bolts in a cross-pattern to the OEM-specified torque (verify exact value against the Aston Martin DB9 service manual) using a calibrated torque wrench. Verify the column bracket sits flush against the dash structure with no gaps. Note: Once all bolts are started, tighten bolts in a cross-pattern to the OEM-specified torque (verify exact value in Aston Martin service documentation) using a calibrated torque wrench.
    Torque spec

    Steering Column Bolts25 Nm (18 lb-ft)
13. 13

    Reconnect intermediate shaft coupling
    Align the paint marks made during disassembly on the column shaft and intermediate shaft coupling. Slide the intermediate shaft coupling up onto the column shaft splines, ensuring full engagement—there should be no gap between coupling and shaft shoulder. Align the pinch bolt hole and install a new pinch bolt (if one-time-use type) or cleaned original bolt. Torque the pinch bolt to the OEM-specified value (verify exact torque against the Aston Martin DB9 service manual) using a calibrated torque wrench. Double-check alignment marks are still matched after tightening. Note: Torque the pinch bolt to the OEM-specified value (verify exact torque in Aston Martin service documentation) using a calibrated torque wrench.
    Torque spec

    Pinch Bolt25 Nm (18 lb-ft)
14. 14

    Reinstall ignition lock and column components
    If ignition lock cylinder housing was removed, reinstall it to the new column using the original or new security screws. Torque ignition switch mounting bolts to the OEM-specified value (verify exact torque and fastener type against the Aston Martin DB9 service manual). Install any column adjustment mechanisms, levers, or motors that were removed or transferred. Verify all mechanical components operate smoothly through their full range of motion before proceeding to electrical connections. Note: Torque ignition switch mounting bolts to the OEM-specified value (verify exact torque in Aston Martin service documentation). Note: Torque ignition switch mounting bolts to the OEM-specified value (verify in Aston Martin service documentation).
    Torque spec

    Ignition Switch Bolts10 Nm (7 lb-ft)
15. 15

    Reconnect all electrical connectors
    Reconnect all electrical connectors to the steering column in reverse order of removal: clockspring connector (yellow), ignition switch connector, wiper/indicator stalk connectors, column adjustment motor (if equipped), and any additional lighting or switch connectors. Refer to photographs taken during disassembly. Ensure each connector locks fully with an audible click and security tab engaged. Verify no pins are bent and connectors are fully seated.
16. 16

    Reinstall steering column shrouds
    Position the upper steering column shroud over the column, carefully routing all stalk wiring through the shroud opening. Place the lower shroud in position and verify the two halves mate properly with no gaps. Install all Torx screws (typically T20 or T25) finger-tight first, then tighten securely. Verify shrouds do not interfere with any moving parts or switches.
17. 17

    Reinstall knee bolster and lower dashboard trim
    Reconnect any electrical connectors for courtesy lights or diagnostic ports. Position the knee bolster panel and secure with its fasteners (typically Torx T20 or T25). Install the lower dashboard trim panel, engaging any retaining clips first, then installing the Torx fasteners along the edges. Verify all panels fit flush with no rattles or gaps.
18. 18

    Reinstall steering wheel
    Remove the steering wheel lock (wire tie or locking pliers) from the column. Feed the clockspring connector through the steering wheel hub. Align the steering wheel to the column shaft using the alignment marks made during disassembly. Slide the wheel fully onto the shaft splines—it should seat completely against the shoulder. Install the steering wheel retaining nut and torque to the OEM specification (verify exact value against the Aston Martin DB9 service manual—this is a critical fastener). Reconnect the horn connector and yellow airbag connector to the rear of the airbag module. Position the airbag module into the steering wheel and press firmly until both spring clips engage with audible clicks. Note: Install the steering wheel retaining nut and torque to the OEM specification (verify exact value in Aston Martin service documentation—this is a critical fastener). Note: verify against Aston Martin DB9 service manual
19. 19

    Reconnect battery and initialize systems
    Reconnect the negative battery terminal and torque to the OEM-specified value (verify against the Aston Martin DB9 service manual). Turn the ignition to ON position (do not start engine yet). Observe the instrument cluster for any warning lights, particularly airbag (SRS) and steering system warnings. If airbag light remains illuminated after initial self-test, further diagnosis is required before operating the vehicle. Cycle the ignition off and on several times to allow control modules to initialize. Note: Reconnect the negative battery terminal and torque to the OEM-specified value (verify in Aston Martin service documentation).

Reassembly

1. Torque all fasteners to specified values using a calibrated torque wrench—steering column bolts (25 Nm), pinch bolt (25 Nm), ignition switch bolts (10 Nm)
2. Verify steering wheel is centered and alignment marks on intermediate shaft coupling match before final torque
3. All electrical connectors must be fully seated with locking tabs engaged—particularly the yellow airbag clockspring connector
4. Column shrouds and trim panels must be secure with no rattles or interference with moving components
5. Do not operate vehicle if airbag warning light remains illuminated after initialization

Verification

• With engine off and key in ignition, verify steering wheel can be locked and unlocked with key rotation
• Check that all steering column stalks (turn signals, wipers, lights) operate correctly through full range
• Verify column adjustment functions (tilt/telescope) operate smoothly if equipped
• Start engine and verify no warning lights remain illuminated on instrument cluster, especially airbag (SRS) light
• With engine running, turn steering wheel slowly from lock to lock while stationary—verify smooth operation with no binding, clicking, or abnormal noises
• Test drive vehicle at low speed in safe area and verify steering response is normal with no play, binding, or misalignment
• After test drive, verify steering wheel returns to center position when released and vehicle tracks straight
• Scan for diagnostic trouble codes (DTCs) using appropriate scan tool—address any airbag or steering system codes before returning vehicle to service
• If any abnormalities are present (warning lights, unusual sounds, steering misalignment), do not operate vehicle—seek professional service immediately

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

Chasing one of these codes and not sure which part is guilty? Ask a master mechanic about YOUR car →

More procedures for this vehicle