quarkww

Hello

i bought a car from friend. i cant open trunk from fob. when i click the button i heard the click sound and its getting unlock but it doesnt lift up and when i try to lift by myself i need to force alot to open it with hands. also it doesnt stay at the top. when i leave it while open in few seconds its closing again. where might be the problem. actuator or lift supports ?
thanks in advance

tusabes

First - do you have the power trunk open and close feature ? Many s430 only have a power trunk opener, only some have the Hyddraulic to both open and close the lid

If you have the power open and close , you need to determine if the pump has fluid
It's located near the battery fill the reservoir with pentosin chf11s

quarkww

thanks for the respond.

i think it does have power. because once i click to open trunk i hear something like its trying to open it but its not. so its only unlocking it not even moving. and then im opening it while using alot force.

tusabes

All w220 have a trunk lid that will power unlock with the remote button, or the button on the drivers door

But Only some w220 have a trunk lid that will both power open AND close - these have a hydraulic motor for the trunk lid- that will raise and lower the trunk lid . They also have a red button inside the trunk lid to close it using power. Do you have this button inside your trunk lid ?




If you have that button on the lid and you hear a motor noise like something is trying to work, your pump is likely out of fluid The hydraulic pump for the trunk lid is next to the battery . It is probably out of hydraulic fluid, the red arrow in this picture shows the fluid reservoir

quarkww

i got that button on the door near to bottom. so once i push that i hear the click sound from trunk but nothing happens. its like trying to open but it doesnt.

quarkww

btw trunk support lifts also doesnt work well.i barely open the trunk and im using alot of force to opening it and supports doesnt keep it tight. so it goes down again in few seconds. do i need to change lift supports or hydraulic fluid or both

tusabes

Everyone has the button on the door - even cars with just power trunk unlock

Do you have the red button on the inside of the trunk lid ?

remove the right side trunk panel and add hydraulic fluid where the red arrow shows

You will need to add hydraulic fluid to make the trunk motor work

And you will need to replace the gas lift support struts if they are not holding the lid up

doni01

iTrader: (1)

From what you are explaining, you definitely need the shocks. They are cheap from the dealer. Replace those first and then see if the problem persists and take it from there.

wallyp

I don't have the power lift, so don't know what they have - but my S430 doesn't have "shocks", just springs.

tusabes

Right, the cars that don't have the powered lift up/down lid use springs instead of gas struts

The powered lids use gas struts as well as the hydraulic lift/lower motor

ibeforreal

It literally takes less than 10 minutes to replace the trunk shocks. Use the Pentosin fluid in the hydraulic pump.

quarkww

yes it has that button inside the trunk lid for closing trunk automatic but also it doesnt. btw i changed struts so far. it lifts without forcing much with hands. and i also give it to benz service they said 2207500185 needto be change which is actuator. they asked 450$ for it. on ebay there iis 100$ used one. i will get and try to replace myself. so do u still thnik should i change the fluid in hydraulic pump. coz once i see that pump beside the battery. there is still fluid in it.

tusabes

If it's full of fluid it should be ok
But if it's just making noise and not lifting the trunk that's the symptom of low fluid

quarkww

so the sound comes from trunk actuator
not from the hydrualic pump. and there is less than a half fluid in there. should i fill it till full ?

tusabes

Yes fill it

eldos1

MY 06 S500 had a problem and it was that the hinges needed to be greased up. It started to open slow and one side of the trunk lid when closed was slightly misaligned. I used some white lithium/ Firearms grease I had. It had a small tip and could work it down into the hinges. Runs smooth now.

quarkww

there is a hose that not attached somewhere. is it normal
and i will fill that today

quarkww

filled up nothing changed

DrDoe

Is your pump working? I.e. Do you see the strut moving if you manually apply 12V to the pump?
I had these exact symptoms You can search the threads for trouble shooting steps and solution

DrDoe

Also I'm not sure if your Benz service diagnosed it correctly. Actuator is for lock/unlock. It won't raise or lower your trunk lid.

quarkww

i replaced actuator nothing changed. so do u think the problem is hydraulic pump ?

DrDoe

That's what I thought on the actuator.
Not necessary the hydraulic pump but first you need to give 12V to the hydraulic pump to see if there's any mechanical movement.

DrDoe

quarkww, i found some old images here. You can disconnect the connector as pictured and give 12v to the plug with brown/white wire.
If the pump is working then the horizontal strut should move.
The relays in the 2nd picture is another component of raising/lowering function.

quarkww

is there anything wrong wtih them. coz some of the cars ihave seen on youtube that they have different type struts. where is the part that will lift the trunk up

DrDoe

Those struts are for holding the lid from gravity. Those are not for raising/closing lids. You need to remove the trunk passenger carpet piece to access the power horizontal strut.