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