WIS 88.50 Trunk/Boot Lid

Description - Trunk/Boot Lid

The S-Class Trunk/Boot Lid is pneumatically controlled and can have some or all of the following functions depending on the configuration codes as detailed on the Vehicle Data Card (List of Option Codes).

• Auto opening
• Auto or self closing
• Extension and retraction of Trunk/Boot Lid handle
• Pneumatically operated lock and unlock with mechanical (emergency key) overide
• Trunk/Boot Lid pull down function.

The positive and negative pressures required for the pneumatic control of the Trunk/Boot Lid functions are generated by the Pneumatic System Equipment (PSE) Pump.

Locking Mechanism Actuator - Trunk/Boot Lid

Retractable Trunk Lid Grip (RTG) - Trunk/Boot Lid

Photo of a W220 2003 (Update) S500L with Retractable Trunk Lid Grip (RTG) in hidden or retracted position.

Photo of a W220 2003 (Update) S500L with Retractable Trunk Lid Grip (RTG) in open or extracted position. TBD (Will upload as soon as mine is working again!)

Part Numbers - Trunk/Boot Lid

• Locking Mechanism Actuator 220 750 0684

Issues - Trunk/Boot Lid

Common issues relating to the trunk/boot lid functions are;

• Hissing Sound on Trunk Closure
• Broken or Failed Pneumatic Actuators
• Cracked or broken pneumatic lines.
• Cannot remove the actuator rod to get the locking mechanism out of the trunk
• Open the Trunk/Boot when the Battery is Dead

How to Jump Start the Car and Open the Trunk/Boot when the Battery is Dead

Issue

A completely dead battery prevents the boot lid from being electrically opened. A jump start is not possible if you cannot access the battery as the W220 does not have accessible jump ports.

Solution

Extract the mechanical key from the Remote Key Fob and use it to open the Trunk. If that doesn't work you may have to charge the battery prior to jump starting the car.

• Pull the carpet back from the top under the front passenger side dash.
• Behind the Styrofoam insulation there is an aluminum plate.
• Unscrew the 3-4 bolts to get to the positive terminal.
• Hook up a charger and charge the battery as long as possible.
• After a while you should be able to start the car.
• If the trunk still will not open reset it by removing the 20A yellow fuse from under the rear right passenger seat fuse box.
• Leave it out for about 5 mins.
• Then put it back in and then try to open the Trunk.
• The Trunk should now open.

Reference: http://mbworld.org/forums/s-class-w220/328173-dead-battery-cant-get-trunk-inside-car-how-jump-start-help.html

DIY - Removing Trunk Lid Lining

Open the trunk.

Plastic panel is attached with 4 screws.

Use Torx 20h screw driver.

Remove the screws.

Remove the plastic panel.

Lining is kept attached with 13 clips.

Detach the lining.

Lining removed.

Trunk lid without lining.

DIY - Removing Trunk Lining

Pull the plastic piece over the trunk lock and lip. Its held in by several 2 piece plastic push clips.

A small slim screwdriver will deal with the push clips nicely.

Use a Torx T-20 to remove the cargo net hold downs. 4 on the back plastic piece and 2 more on the trunk floor forward. After removing all the clips and hold downs, the piece should pull easily straight up.

There are large plastic hold downs under the tops of all the panels.

The right panel does need to be gently folded a bit to get it out.

The left panel is a bit easier. Just tuck a finger into the corner and gently pull it out and towards you.

The center panel has 3 spring steel clips on the top edge.

Gently pull the panel off those and rotate it towards you a bit to get to the trunk lights (2) and pop those out of the panel.

Continue to rotate the back panel towards you and out of the trunk.

DIY - Repair of Broken Pneumatic Actuator

With thanks to BenzWorld member 'subscriber' for posting an excellent description of his repair of a broken locking mechanism pneumatic actuator.

Note the broken plastic tabs on the perimeter of the actuator.

See http://www.benzworld.org/forums/w220-s-class/2532833-repair-part-220-750-0684-trunk.html