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Trunk Release Button and Solenoid Replacement
 
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Pelican Technical Article:

Trunk Release Button and Solenoid Replacement

Nick Czerula

Time:

1 hour1 hr

Tab:

$200

Talent:

**

Tools:

T20 Torx driver, 10mm socket, flathead screwdriver

Applicable Models:

BMW Z3 (1996-02)

Parts Required:

Trunk release button

Hot Tip:

Check trunk latch and button operation before closing trunk

Performance Gain:

Repair broken trunk release button or solenoid

Complementary Modification:

Replace trunk latch

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 Z3 trunk.

The trunk release button is mounted in the trunk lid and is a mechanical button that is locked and unlocked by a solenoid (also referred to as actuator).The trunk release button can wear out or break over time; usually the aluminum release mechanism breaks. The unlocking solenoid also fails and prevents the trunk from being remotely unlocked. Both parts are serviceable separately. If you hear the trunk lock solenoid attempting to unlock the trunk lid with no success, this is a sign of a faulty solenoid. When replacing the solenoid, mark the location of the screws, as the mounting holes are slotted to allow adjustment.

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. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

The trunk release button (yellow arrow) opens the trunk when pressed.
Figure 1

The trunk release button (yellow arrow) opens the trunk when pressed. It can be unlocked remotely using the central locking system, via the solenoid, or by using your key.

To access trunk release button, pull plastic cover off right side of the trunk lid.
Figure 2

To access trunk release button, pull plastic cover off right side of the trunk lid.

Then pull the locking rod off the button.
Figure 3

Then pull the locking rod off the button. The rod will pull straight out. You can use a small flathead screwdriver to lever it out if necessary. Be careful not to bend it.

Next, pull the release lever (yellow arrow) off the button.
Figure 4

Next, pull the release lever (yellow arrow) off the button. Remove it the same way you did in the previous step.

Remove the two 10mm trunk release button fasteners (yellow arrows).
Figure 5

Remove the two 10mm trunk release button fasteners (yellow arrows).

Remove the button from the truck by pulling it straight out.
Figure 6

Remove the button from the truck by pulling it straight out. If it won't slide out, sometimes I find rotating it clockwise slightly while pulling it helps.

Remove the two T20 Torx trunk lock solenoid fasteners (yellow arrows).
Figure 7

Remove the two T20 Torx trunk lock solenoid fasteners (yellow arrows).

Pull solenoid out of trunk lid to access electrical connectors.
Figure 8

Pull solenoid out of trunk lid to access electrical connectors. Squeeze the release tabs on the large connector and pull it off to disconnect. Then pull the small connector (yellow arrow) straight out of the solenoid.

When installing new solenoid, try to get fasteners in same place as before.
Figure 9

When installing new solenoid, try to get fasteners in same place as before. You can see my vehicle has two marks from the screws (yellow arrows), I use these marks to align solenoid and gain a good starting point for the adjustment. Install solenoid, then tighten screws in same place they were in before.

Install trunk release button.
Figure 10

Install trunk release button. Align plastic tab on trunk seal with hole in button (yellow arrows). Install fasteners and tighten. Then install rods to button assembly.

Before closing the trunk, use a flathead screwdriver to lock the latch.
Figure 11

Before closing the trunk, use a flathead screwdriver to lock the latch. Then use the central locking system to lock, then unlock the trunk. Confirm the solenoid is working and adjusted properly. If not, loosen the screws and slide it fore or aft as needed. Once confirmed the trunk lock is functioning, reinstall plastic cover.

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Comments and Suggestions:
Martin Cusack Comments: Ok i was doing this process and i broke the holder pin on the trunk button that opens the latch i cannot find a replacement for the actual trunk button please help.
February 16, 2015
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799 and they can help figure out which part or repair kit you need.
- Nick at Pelican Parts
 
Paul Moody Comments: Good morning. I have a 2000 Z3 Roadster and I somehow lost one of the black plastic inserts in the trunk that corresponds with the upper plunger. I guess I can make one but I'd rather buy the original part. Possible?
December 27, 2014
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799 and they can help figure out which part or repair kit you need.
- Nick at Pelican Parts
 
Chi Comments: Great illustrations, thank you very much.
July 25, 2014
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 

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Page last updated: Sat 12/3/2016 02:08:14 AM