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Trunk Lock Cylinder and Latch Replacement
 
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Pelican Technical Article:

Trunk Lock Cylinder and Latch Replacement

Nick Czerula

Time:

1 hour1 hr

Tab:

$200

Talent:

**

Tools:

T25 T30 Torx driver, trim panel tool, flathead screwdriver

Applicable Models:

BMW Z4 Convertible (2003-06)
BMW Z4 Coupe (2006)

Parts Required:

Trunk lock cylinder and latch

Hot Tip:

Check trunk latch and button operation before closing trunk

Performance Gain:

Repair broken trunk lock cylinder and latch

Complementary Modification:

Replace trunk struts

The trunk lock is electrically networked with the central locking system. The trunk lock cylinder and latch work in conjunction via cables and electrical switches to open your BMW Z4 trunk.

The trunk lock cylinder is mounted in the trunk lid and is a mechanical lock cylinder that is locked and unlocked by a key. The trunk lock cylinder can wear out or break over time; usually the key wears it out.

The latch is mounted in the trunk lid and has the electrical switch and cable release mechanism to open the trunk. If yours fails, the trunk may not stay closed or it may rattle.

To avoid marring the paint and trim, work with a plastic prying tool or wrap a screwdriver tip with masking tape before prying out body or interior items.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Do not work on your vehicle if you feel the task is beyond your ability.

Vehicle models change and evolve as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

To replace the latch, the lock cylinder has to be removed. First I will show you how to remove the lock cylinder, then the latch. If you are only replacing the lock cylinder, stop after the final lock cylinder step and reverse removal steps.

First you have to remove the emergency release cable from inside the trunk.
Figure 1

First you have to remove the emergency release cable from inside the trunk. Start by removing the handle. Pull it out of the mount, then unclip the cable and remove the handle (inset). Then remove the two Phillips head screws (red arrows).

Pull the handle trim panel down, then squeeze the cable locking tabs (red arrows) and pull the cable out of the trim.
Figure 2

Pull the handle trim panel down, then squeeze the cable locking tabs (red arrows) and pull the cable out of the trim. Remove the trim piece from the vehicle.

Working at the lock cylinder, remove the two T25 Torx screws (red arrows).
Figure 3

Working at the lock cylinder, remove the two T25 Torx screws (red arrows).

As you remove the second screw for the lock cylinder, remove it with the reinforcement.
Figure 4

As you remove the second screw for the lock cylinder, remove it with the reinforcement.

To remove the lock cylinder (blue arrow), rotate the lock cylinder 45° clockwise (red arrow) until the fastener holes are exposed through the slots, as shown.
Figure 5

To remove the lock cylinder (blue arrow), rotate the lock cylinder 45 degrees clockwise (red arrow) until the fastener holes are exposed through the slots, as shown. Reverse rotation when installing.

Pull the lock cylinder down, then squeeze the cable locking tabs (red arrows) and pull the cable out of the lock cylinder mount.
Figure 6

Pull the lock cylinder down, then squeeze the cable locking tabs (red arrows) and pull the cable out of the lock cylinder mount. Unclip the cable end. Remove the lock cylinder from the vehicle.

Working at the trunk latch, remove the three T30 Torx fasteners (red arrows).
Figure 7

Working at the trunk latch, remove the three T30 Torx fasteners (red arrows).

Pull the latch out through the emergency release handle hole enough to access the electrical connector (red arrow).
Figure 8

Pull the latch out through the emergency release handle hole enough to access the electrical connector (red arrow). Pull the connector straight out to remove. Then remove the latch.

To replace the latch cables or swap them to a new latch; use a trim panel plier tool to pull the center pin (red arrow) out of the latch cables.
Figure 9

To replace the latch cables or swap them to a new latch; use a trim panel plier tool to pull the center pin (red arrow) out of the latch cables. Then pull the pin out (yellow arrow). Next remove the cable from the latch (blue arrow).

Unclip the tab (red arrow) and slide the cables off the latch.
Figure 10

Unclip the tab (red arrow) and slide the cables off the latch. Reverse steps to install new latch and cables. Before closing trunk, close latch using a flathead screwdriver and confirm it releases using the key.

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Page last updated: Wed 12/7/2016 03:00:39 AM