Amplifier

Remove and replace the audio system amplifier located in the trunk area of the 2009 Aston Martin DB9.

Warnings

Tools required

Parts

• Audio amplifier × 1 — Use OEM specification or verified aftermarket equivalent

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect battery negative terminal using 10mm socket
3. Wait minimum 5 minutes for audio system capacitors to discharge
4. Open trunk fully and remove any items from cargo area
5. Prepare clean work area for removed trim panels

Procedure

1. 1

   Access trunk side trim panel
   Locate the trunk side trim panel behind which the amplifier is mounted (verify left or right side against factory documentation for this specific vehicle). Identify visible trim fasteners along the panel edges. The amplifier is mounted behind this panel in the trunk area. Identify visible trim fasteners along the panel edges. Note: Locate the trunk side trim panel concealing the amplifier (verify correct side against OEM documentation for your specific vehicle). Note: Locate the trunk side trim panel on the side where the amplifier is mounted (verify side against OEM documentation for this specific vehicle).
2. 2

   Remove trunk side trim panel fasteners
   Remove the Torx fasteners securing the trunk side trim panel on the side where the amplifier is mounted (verify left or right against factory documentation for the 2009 DB9). Check for Torx fasteners (verify exact size against factory documentation for the 2009 DB9) along the panel edges and lower mounting points. The exact fastener count and locations must be verified against factory documentation for the 2009 DB9 before proceeding; do not assume a fixed number. Store fasteners in a container to prevent loss. Store fasteners in a container to prevent loss.
3. 3

   Release trim panel clips
   Using plastic trim tools, carefully release the push-clips securing the trim panel. Work from one end to the other, gently prying the panel away from the body. Listen for clip release sounds and stop if excessive resistance is encountered to avoid breaking clips.
4. 4

   Remove trunk side trim panel
   Once all fasteners and clips are released, carefully pull the trim panel away from the trunk wall. Check for any electrical connections (such as courtesy lights) before fully removing. If present, disconnect by pressing the connector release tab. Set panel aside in a safe location.
5. 5

   Locate amplifier assembly
   With trim removed, locate the audio amplifier mounted to the trunk wall structure. The amplifier will be a rectangular metal or plastic housing with multiple wiring harness connectors and mounting bracket fasteners visible.
6. 6

   Disconnect amplifier electrical connectors
   Identify all electrical connectors attached to the amplifier. Identify all electrical connectors attached to the amplifier (verify the exact number against factory documentation for this vehicle). Press the release tab on each connector and pull straight back to disconnect. Note the orientation and position of each connector for reinstallation. Press the release tab on each connector and pull straight back to disconnect. Note the orientation and position of each connector for reinstallation. Note: The DB9 amplifier has several multi-pin connectors; count and note each one present on your specific unit before disconnecting.
7. 7

   Remove amplifier mounting fasteners
   Remove the fasteners securing the amplifier mounting bracket to the body structure (verify exact count and fastener type/size against factory documentation for the 2009 DB9). Support the amplifier weight as you remove the final fastener. Support the amplifier weight as you remove the final fastener.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
8. 8

   Remove amplifier from vehicle
   With all fasteners and connectors removed, carefully withdraw the amplifier from its mounting location. Maneuver it through the trunk opening, being careful not to damage surrounding trim or wiring. Inspect the mounting area for any loose hardware or debris.
9. 9

   Prepare replacement amplifier
   Remove the new or replacement amplifier from packaging. Compare it to the old unit to verify correct part number and connector configuration. Transfer any mounting brackets or hardware from the old amplifier if they are not included with the replacement unit.
10. 10

    Install replacement amplifier
    Position the replacement amplifier into the mounting location, aligning the mounting holes with the body structure. Install the mounting fasteners hand-tight initially, ensuring the amplifier sits flush against its mounting surface. Torque fasteners to specification in a cross-pattern.
    Torque spec

    Module Mounting Bolts8 Nm (6 lb-ft)
11. 11

    Reconnect electrical connectors
    Reconnect all electrical connectors to the amplifier in their original positions. Push each connector firmly until the locking tab clicks into place. Gently tug on each connector to verify secure connection. Ensure no wiring is pinched or under tension.
12. 12

    Reinstall trunk side trim panel
    If applicable, reconnect any electrical connections for courtesy lights. Position the trim panel back into place, aligning all clips with their mounting holes. Press firmly along clip locations until each clips into place. Reinstall all Torx fasteners and tighten securely, but do not overtighten as this can crack the trim.
13. 13

    Reconnect battery and initialize system
    Reconnect the battery negative terminal and tighten to the factory-specified torque for the 2009 DB9 battery terminal clamp (verify value in factory documentation). Turn ignition to accessory position and power on the audio system. Allow the amplifier to initialize (may take 10-20 seconds). Check for any warning lights or error messages on the display. Note: Reconnect the battery negative terminal (located in the trunk on this vehicle) and torque the terminal clamp to the OEM-specified value; verify whether audio/security re-initialization or code entry is required after power restoration.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Ensure all electrical connectors are fully seated and locked
2. Verify all trim fasteners are reinstalled and secure
3. Check that trim panel gaps are consistent with opposite side
4. Confirm no tools or hardware left in trunk area

Verification

• Turn on audio system and verify sound output from all speakers
• Test all audio sources (radio, CD/media player, auxiliary input) to confirm amplifier function
• Adjust volume through full range and verify no distortion or cutting out
• Check balance and fade controls to verify all channels are amplifying properly
• Inspect trunk area for any rattles or loose trim while playing audio at moderate volume
• Verify no warning lights or error messages displayed on instrument cluster or infotainment screen

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