CLK 320 Auto - Boot Lock Switch Always On

[philos]

Hi guys!

Aaarrggh! It's back! Below is a link to my original post - driving back along the M4 this evening and boot suddenly popped open - pulled over shut it and then opened the drivers door - popped again! Similar problem to last time -no ESP / BAS / ABS errors this time however (yet?) and a slight change as well - this time if I shut the door and shut the boot the light stays off. As soon as I open either doors, the boot pops!

This is driving me nuts - anybody got any ideas that my mechanic friend and I can try? If you read the last post you know the problems I had with neighbours getting p***ed off with the alarm and damaging the car - don't want or need a repeat - again, any help greatly received?

Original Post:
http://forums.mercedesclub.org.uk/showthread.php?t=24832

Many thanks!

 

[television]

This one is almost beyond me without having a fault code read out.

If the PSE pump or the rear SAM unit has any water ingress the whole central locking gets mixed up, you even have a remote button for the boot and the problem could be there.

Your PSE mump is one pump with valves that open to command that has been given. So if you open the drivers door and the boot opens,clearly two valves are opening at the same time,rather than just the one.

the information to do this is in the ODB11 Data bus and comes from the rear SAM unit (SAM = signal aquasision module) this is the box in the boot that controls the lighting,alarm,and locking, A few drops of water is all it takes to contaminate the memory, so make sure it is all dry, look for water marks around it and get the fault codes cleared and re activate all of the circuits.

At the worst you may have to get a new SAM and have it coded. and the water in boot mod fitted.

Malcolm

 

[philos]

Aah! Malcolm!
You truly are a gentleman - many thanks for getting back so quickly - I'm afraid I have no idea what the SAM unit looks like - I have just emptied the boot but the darkness has beaten me - Is SAM unit on the left or right by the battery? Sorry - newbie at all this...

~ PHILOS ~

 

[philos]

*** UPDATE ***
Been "dry" here in SW London for the last two days - had the problem yesterday but came to the car this morning - unlocked via electic key and opened door - boot stayed shut! Centre console light did not come on - released boot via manual key and centre light came on - shut boot - shut drivers door, alarmed via key - all OK. Walked away...... "clunk" - boot opened and triggered alarm! Oooooooo! This is frustrating! Have searched the posts on three separate MB forums....can't believe I am the only person to suffer with this problem. Mobile MB Technician coming to check this afternoon and will plug in laptop to get diagnostics....will update later guys.

 

[ricw]

Hi, I've just become a member and read your thread. I had a similar problem with my 1999 clk 320 last year: the red light on the centre consul kept coming on but at first there was no other problem. Then the boot wouldn't open (opposite to your problem but there may be a connection?) It was eventually traced to the horn unit being faulty and causing a fuse to blow. The horn unit was replaced and the problem has not returned. Don't know if this helps but ... Good luck

 

[philos]

Hey RICW!
Thanks for taking the time to respond - I've had all the fuses checked and there is no problem - the car was hooked up to a laptop this afternoon and the diagnosis came back as......zilch wrong! Can't believe it! Was able to show the tech the problem in action and he reckons it's a faulty switch in the centre console and that it needs removing and cleaning or replacing - thing is I get the feeling that I could spend a fortune "trying" things and not get anywhere. Guess it's off to MB Dealer (££££!) but if they use the same diagnostic tools and laptop as the guy who came to see me today, what's the point? Love this car but from reading many, many posts on multiple MB forums, electrical faults seem to be a major issue with these cars - wish I'd known this before buying it - my other choice was a new Mondeo ST220 - fully loaded! LOL! Still - would have bought the Merc anyway as it looks luverly! Sigh! Sucker for a curvy shape! ;-)

 

[television]

Philos can you send me a PM

Malcolm

 

[50sflash]

Hi I have had this fault exactly the same as you describe, now that was a 208 chassis clk230 komp and I traced the fault to a broken wire, If you remove the boot lid cover & then the plastic trim covers off of the hinge arms you will see the boot wiring for the locks & plate lamps, follow these into the back of the car were you might see one or two of the wires are damage, Let me know how you get on. John Ps does the boot have extra dead locks?

 

[philos]

Thanks 50sflash - this sounds like it could be a place to start - going to take it to a mechanic friend and get him to have a look - thanks for the info - will let you know what happens

 

[philos]

Finally resolved!

Hi guys!
OK - finally got this issue resolved and somewhere in the recent fog that is my memory, "television" (Malcolm) called this one correctly. Bit the bullet and took a chance on a MB Indie in Tooting (MercServices) - what a brilliant bunch of guys - diagnostics revealed this time that it was a faulty PSE (Pneumatic System Equipment) unit. For some reason it had failed and was reporting that my two rear doors (CLK Coupe???) were open and thus it was activating the alarm. The fault was also causing the boot to permanently open itself - that's fixed too. Went to the local Stealership in the morning and they were so laid back they were almost comatose and they visually diagnosed it as a faulty boot lock but couldn't do anything until Thursday - and only if they could get the part by then. Blimey guys! Customer Service was zilch!
Don't know what the rules are in the forums about promoting a service centre but I will incur any wrath from the Administrators just to trumpet the guys at MercServices. Courteous, efficient, polite and empathetic and allround good guys - so if you 're after assistance in SW London, give 'em a Google and ask for David.
So, she's back on the road - no more p**ed off neighbours due to alarm going off (but I'd still like to know which coward keyed her up!) and she's as beautiful as ever.
Details:
Diagnostic Check with Star Diagnostics - No charge
Repalcement New MB Central Locking Pump - £396.31
Control Unit Recode after test - £7.50
Labour - £75.00
Total - £553.78
Wash and spruce up afterwards
Smile on my face as I drove her home - Priceless!

Thanks for all the help with this and Malcolm....."We're not worthy!"...

 

[television]

Thank goodness you are out of trouble, these fault kill me racking my brains out for the link between all of the faults.

Philos, you must get the mod for the boot seal to stop the water running down other wise you will be back to square one.

malcolm

 

[craigdm]

Thank goodness you are out of trouble, these fault kill me racking my brains out for the link between all of the faults.

Philos, you must get the mod for the boot seal to stop the water running down other wise you will be back to square one.

malcolm

Prey, what is this mod to which you refer ??? Would this be one for my 2000 CLK 320 ??

Thanks.

 

[television]

Prey, what is this mod to which you refer ??? Would this be one for my 2000 CLK 320 ??

Thanks.

Your MB dealer will know,it is a mod to stop any water running into the electrics in the trunk,it diverts its or something like that,there is a recent thread on it.

Malcolm

 

[philos]

Malcolm - any idea of what this mod should cost? MB dealer in Mitcham requires me to rob a post office and local bank branch!
Something we can do ourselves?

 

[rossnd]

Thanks - been looking for some feedback on Mercservices in Tooting as I am booked in there with my 1985 107 for Monday.

I shall report back how it all goes and hopefully will second your feelings!

Ross
1985 Mercedes SL 500