Trunk/Liftgate Actuator

Remove and replace the trunk/liftgate actuator (latch motor) on a 2005 Dodge Viper to restore power trunk release functionality.

Warnings

Tools required

Parts

• Trunk latch actuator assembly × 1 — Use OEM specification

Preparation

1. Park vehicle on level ground and engage parking brake
2. Open trunk/rear clamshell fully and secure in open position
3. Disconnect negative battery terminal and wait 2 minutes for system discharge
4. Gather all tools and place work light inside trunk area for visibility
5. Take photos of actuator electrical connector orientation and mounting position for reference

Procedure

1. 1

   Remove trunk trim panel
   Locate and remove the trunk trim panel covering the latch mechanism. The panel is secured by plastic push-pin fasteners around its perimeter. Use a panel trim tool to carefully pry and release each fastener, working from one corner around the perimeter. Remove the panel and set aside. Note the location and orientation of fasteners for reinstallation.
2. 2

   Access the trunk latch assembly
   With the trim panel removed, locate the trunk latch assembly mounted to the body structure at the center rear of the trunk opening. The actuator motor is integrated into the latch assembly. Identify the electrical connector attached to the actuator and the mounting fasteners securing the latch assembly to the body.
3. 3

   Disconnect actuator electrical connector
   Locate the electrical connector on the actuator. Press the release tab on the connector body and pull the connector straight off the actuator terminals. Do not pull on the wires themselves. If the connector is difficult to remove due to corrosion or tight fit, gently wiggle while applying even pressure to the connector body. Inspect the connector terminals for corrosion or damage.
4. 4

   Release latch striker engagement
   The latch mechanism may be in the engaged position. If the actuator is locked in the engaged position, you will need to manually release it before removal. Locate the manual release lever or cable within the latch mechanism (typically a small lever visible on the side of the latch assembly). Actuate this lever to release the latch pawl from its engaged position, allowing the assembly to move freely.
5. 5

   Remove latch assembly mounting fasteners
   Remove the fasteners securing the trunk latch assembly to the body structure. The assembly is secured by mounting fasteners accessible from inside the trunk compartment (verify exact count and drive type against factory service documentation). Use the correct bit or socket to remove these fasteners completely. Support the latch assembly with one hand while removing the final fastener to prevent it from falling.
6. 6

   Remove latch assembly with actuator
   With all fasteners removed and electrical connector disconnected, carefully extract the latch assembly from its mounting location. The assembly may require slight rotation or angling to clear the mounting pocket and body structure. Remove the complete assembly from the vehicle. Inspect the mounting area for debris, corrosion, or damage.
7. 7

   Prepare new actuator assembly
   Unpack the new trunk latch actuator assembly. Verify it matches the removed unit in mounting hole pattern and electrical connector configuration. Ensure the actuator is in the unlatched (open) position before installation. If necessary, manually cycle the actuator mechanism to the correct position. Apply a small amount of dielectric grease to the electrical connector terminals on the new actuator to prevent future corrosion.
8. 8

   Install new latch assembly
   Position the new latch assembly into the mounting pocket, aligning the mounting holes with the body structure. Angle or rotate as necessary to clear the body structure during installation. Ensure the latch mechanism is properly oriented with the striker engagement path. Start all mounting fasteners by hand to ensure proper thread engagement before tightening.
9. 9

   Torque mounting fasteners
   Tighten the latch assembly mounting fasteners in a star pattern if multiple fasteners are present. Torque fasteners to the factory-specified value for the trunk latch mounting bolts (verify in service documentation). Do not overtighten, as this can distort the latch housing and cause binding in the mechanism. Verify the latch assembly sits flush against the body structure and does not have excessive play.
   Torque spec

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

    Reconnect electrical connector
    Plug the electrical connector into the new actuator, ensuring it seats fully with an audible click. Gently tug on the connector body to verify it is locked in place. Route the wiring harness to ensure it will not interfere with trunk closure or the latch mechanism operation.
11. 11

    Reinstall trunk trim panel
    Position the trunk trim panel back into place, aligning all mounting locations. Install the plastic push-pin fasteners around the perimeter, pressing each firmly until it clicks into place. Ensure the panel sits flush and does not have gaps or misalignment.
12. 12

    Reconnect battery and test operation
    Reconnect the negative battery terminal. Torque the battery terminal bolt to 6 Nm (4 lb-ft). Test the trunk latch actuator by using the interior trunk release button and/or key fob trunk release function. The actuator should operate smoothly with an audible click when releasing. Manually close the trunk and verify the latch engages properly with a solid closing sound. Test the release function again to confirm proper operation.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Ensure all electrical connections are secure and properly seated
2. Verify all trim panels and fasteners are fully installed with no loose components
3. Confirm the trunk latch engages firmly and releases smoothly through all methods (interior release, key fob, manual emergency release)

Verification

• With the trunk closed, physically pull upward on the rear clamshell to verify the latch holds securely with no movement or play
• Test the power release function from both the interior button and key fob (if equipped) at least three times to ensure consistent operation
• Verify the trunk closes smoothly without requiring excessive force and latches on the first attempt
• Check that the manual emergency release (if present) still functions correctly
• Inspect the trim panel to ensure it is properly secured with no rattles or loose sections
• If the latch does not engage securely or the actuator does not operate consistently, DO NOT drive the vehicle until the issue is resolved

Related trouble codes on this vehicle

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