W169 A150 2008. Rear passenger door won’t stay locked with central locking

Stuw2008

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Hi all,

I’m new here and am hoping for some top tips for this. I have an A150 2008 petrol manual that’s got an issue with door locking. I’ve read about similar sounding issues with this car but it’s not quite the same.

Only affects NSR passenger door. When central locking used to lock car all the door lock buttons drop down but then this door pops back up. Only once. No bouncing. It’s as if it is free to return up. If I’m in the car and hold it down then the door is locked from outside but as soon as I take my finger off it pops back up freely.

I tried to restrict the buttons movement a bit with a piece of cable tie wedged down to add friction but this made it go into bouncing mode banging up and down rapidly. So I removed that and it’s back to initial state. Is it a spring issue?

Does anyone know if there are airbags in these door cards to be wary of should I attempt to have a look further. I’m happy to do my own work on it.

Thanks for reading.
 

mattkh

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A160 W168 1999 1.6
A wild shot.
Your car has a vacuum system to hold down the 'button'. Sooo the pipe for the vacuum for the NSR door has come off the junction at the pump end. The vacuum pump may be in the boot.
 
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Stuw2008

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A wild shot is all it may take. Thanks for your reply and idea. It sounds plausible to me. The odd thing is I’ve been to have a look for the pump and so far no joy finding it. It must be under the floor trim or somewhere. However after weeks of it not working it’s now deciding to lock properly. Maybe moisture in there or an intermittent vacuum problem.

Thanks again. Now to find the elusive pump....
 
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Stuw2008

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Nope. It’s packed up again.
 

ajlsl600

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clk3202001,sl6002003 with everything regrettably sold ,A class 170cdi auto. NG/TF1800 ML250
On w168 its in boot next to spare. There is if u Google a tutorial on how to replace it, my wife changed ours whilst I was away here. Shud tell u about connections. Look where pipes pass thru doors as well.
 
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Stuw2008

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Thanks both of you. I have had a good look in then boot area of the W169 and I can’t find it in there. I don’t know if I have to remove the side trim panels but it’s not in the wheel well or under the floor carpet. Will have another search online but so far found Rowes useful site. It’s very useful but not helping me find this elusive pump.
 

ajlsl600

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OK. Sorrio can u not see pipes anywhere on left, right side of boot.
 
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Stuw2008

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Nothing visible on the W169 boot area. No obvious wires or anything. Before I start removing trim I’m hoping to find out exactly where it is but so far the internet hasn’t been able to show me. Even Rowe’s site doesn’t help. Thanks all for your assistance so far.
 

mattkh

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Look at the fuse layout chart that came with the car (in the battery compartment) and see if there is any reference to a vacuum pump.
 

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