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Trunk Lock Replacement

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Old 11-14-2011, 07:55 AM   #1
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Default Trunk Lock Replacement

I wrote up a quick fix for the trunk lock issue that causes a lot of grief and is relatively easy and inexpensive to fix.


Instructions for replacing your upper trunk latch.


This resolves issues with having to slam trunk to get it to latch and having the trunk close and then re-open when you press the close button. The trunk latch was known to be defective and has been re-designed. This same part is used on the A4,A5,A6, Jetta and Passat.


Time required less than 1 hour.
Tools

Required Tools:
Torx 25 driver
Phillips screwdriver
Small flat blade driver
Plastic pry tool/putty knife or other instrument
10mm socket driver (not pictured)

1) Order part number 4F5 827 505 D Lock from the online or from the dealer. Cost is about $45 online $68 from dealer


Part
2) If you go to the dealer pick up an extra metal clip that is used on the trunk trim that you will be pulling off. They get lost very easily.

3) Pry off cover of emergency release to get to Torx 25 screw on emergency release handle


ERelease



4) On the other side on the handle pull there is a small plastic door that when opened will reveal two Phillips screws that secure the
other handle lift to trunk.


Notice picture is taken from sitting inside the trunk.


Pull


5) Take out tool kit 4 Phillips with plastic covers, and pull off black plastic cover over trunk lock


TrunkTool


6) Pry off back panel using plastic tool and pulling. Red indicated approximate position of clips


Lid


7) Disconnect trunk light wire harness. Place trunk liner out of way.


deck


8) Disconnect connector to trunk release and remove 2 10mm nuts, note position of emergency release and lock cables.Remove lock cable first (cable coming from right bottom in picture). Unbolt unit and then slide emergency release cable out.

motor


9) Remove and replace motor assemble, and replace BOTH cables the same order as you took them out. Remember to replace flat plastic cover over release cables. Test emergency release and key by license plate before replacing panel.

NewPart

10) Put back together and enjoy a working trunk lock!




Last edited by 05SilverA8; 11-14-2011 at 08:05 AM.
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Old 11-17-2011, 09:35 AM   #2
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My trunk just went into "winter mode" where it won't latch anymore. Doesn't even try to latch, the motor doesn't even sound like it tries. So is this what will fix it you are saying? Also do you notice a physical difference in the old lock vs the new one that you got?
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Old 11-17-2011, 12:31 PM   #3
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Default Trunk Lock

Yes, you can hear the latch when the trunk shuts. The trunk is back to operating correctly after lubricating the hinges and fixing the lock. The whole procedure takes less than an hour, is relatively easy and well worth it if you are having trunk lock issues. Slamming the trunk down hard several times is not the correct way to treat the car.
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Old 11-17-2011, 04:56 PM   #4
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I could manually move the lock mechanism with the trunk open but no matter how hard or how I shut the trunk the lock won't engage. It's currently sitting trunk unlocked unfortunately. I just want to make sure if I do the replacement of the lock as the OP said that it will in fact work and the lock will engage regardless of temperature.
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Old 11-17-2011, 07:14 PM   #5
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The lock unit was re-designed so hopefully it will work in the cold now.
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Old 11-18-2011, 02:45 AM   #6
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When i took mine apart and lubed it with MBI Instrument grease, it worked fine from then on. Minr failed away from home so the trunk coontents went into the back seat. German engineering.
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Old 11-18-2011, 05:00 AM   #7
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Beginning to wonder if mine is locking or not - have never heard any noticeable "latch" sound.

I know it's turned on in MMI but have never tested it.

Other than not having the key with you and trying it is there any way to know if it's actually locked ?
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Old 11-18-2011, 06:54 AM   #8
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Just pull up on the trunk and it will pop open if it does not close properly. This makes for a very unsafe situation for storing anything valuable in the trunk. Lubrication may solve the problem for a few minutes, but something else in the latch goes bad. It is well worth just fixing the problem for good.
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Old 11-19-2011, 03:51 PM   #9
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Thanks for the DIY write-up. It worked great, but for one thing:

The M5 screw holding the emergency handle on has red-loctite on it. I was using a M25 torx safety bit on it. It twisted it.
So I go get my heavy duty M25 Torx. It snapped the head of the screw off.
so I go buy a screw extractor and drill into the remaining body of the screw. Then the screw extractor snaps. Mother @$$^%^^&*!!!!

So I'm kind of stuck now. The trunk latch is replaced and works fine now, so that's most important. That perfectionist is a little nonplused though since I can't put that handle back on. I might just superglue it on since it fits over a decent-sized hex. Grrrr.

Thanks again.
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Old 11-19-2011, 10:03 PM   #10
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Take ceramic drill bit 4mm, drill extractor and rest of that bolt and clean the tread with M5 tap. Carefully. Don't brake that too. Though ceramic drill can drill it.
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Old 11-20-2011, 06:14 AM   #11
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Quote:
Originally Posted by 05SilverA8 View Post
Just pull up on the trunk and it will pop open if it does not close properly. This makes for a very unsafe situation for storing anything valuable in the trunk. Lubrication may solve the problem for a few minutes, but something else in the latch goes bad. It is well worth just fixing the problem for good.
Thanks. Looks like mine is functional, have just never noticed the lock sound.
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Old 11-20-2011, 07:44 AM   #12
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Thanks. I'll work on it at some point. Currently I have to drill out not only the remaining M5 screw, but also the piece of the extractor that's stuck in there. I'm sure that will drill out easily....lol. Good luck getting a hole in the center.
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Old 11-20-2011, 03:06 PM   #13
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Default Broken Screw & EZ-Out

Sorry to hear about broken screw, perhaps some readers could help on how to extract the broken EZ-Out. Mine did have some locking sealant on it that was blue. I am sure that securing the handle with an adhesive would serve it's purpose quite well. I have never even looked at the handle besides removing it to replace the trunk lock.
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Old 01-15-2014, 02:58 PM   #14
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Hi guys.

I am having very similar issues. My soft close boot mechanism is not working. I have to slam the boot a few times for the latch to engage.

I thought the part I need is a striker plate with motor http://www.partscats.info/audi/en/?i...ail_id=1242145

but this thread suggests it's actually the latch on the boot lid?

Why would the boot latch prevent the striker plate + motor activating?

Does the boot latch on the boot lid have any electrics?
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Old 01-24-2014, 09:46 AM   #15
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Quote:
Originally Posted by a8star View Post
Hi guys.

I am having very similar issues. My soft close boot mechanism is not working. I have to slam the boot a few times for the latch to engage.

I thought the part I need is a striker plate with motor http://www.partscats.info/audi/en/?i...ail_id=1242145

but this thread suggests it's actually the latch on the boot lid?

Why would the boot latch prevent the striker plate + motor activating?

Does the boot latch on the boot lid have any electrics?

I'm having the same problem it would appear.

One day my boot lid decided to fail to latch. It then worked on and off for a week or so (though with more force than should be required). Having read similar advice to above on various Audi forums I ordered a new latch for the boot lid. I replaced it and guess what, still not working. It does latch now but requires a good slam (I don't like that.)

I'm guessing that the part you have linked to here is probably the part that I need.

What does it do exactly? Does it move the striker up so that it latches, then pull it back down again? My motor makes a noise when I open the boot but I can't see anything moving. There is no noise from the motor when I close the boot lid.
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Old 01-27-2014, 05:14 AM   #16
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Hey guys we need some help here. Bump Bump
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Old 01-27-2014, 08:04 AM   #17
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I had the same problem when I bought my 05 when it would latch sometimes but most of the time it wouldn't. I was going to buy a new one but I decided to take the latch off and Wd-40'ed the crap out of it for like 10 minutes and I latched and unlatched it from the latch button as I was lubing it until it got better and I made sure it won't go bad again. I reinstalled the latch on the car and put everything back together and have had no problems since. Latches like new as it came from the factory. I always do the simple cheap stuff first before spending money so it's worth a shot.
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Old 01-27-2014, 08:53 AM   #18
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Quote:
Originally Posted by a8star View Post
Hi guys.

I am having very similar issues. My soft close boot mechanism is not working. I have to slam the boot a few times for the latch to engage.

I thought the part I need is a striker plate with motor http://www.partscats.info/audi/en/?i...ail_id=1242145

but this thread suggests it's actually the latch on the boot lid?

Why would the boot latch prevent the striker plate + motor activating?

Does the boot latch on the boot lid have any electrics?
It also could be the small spring in the bottom part broken. If you open it you will see it. It is easy to fix.
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Old 01-27-2014, 11:03 AM   #19
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Default Trunk Lock Replacement

For what it's worth...
Mine was intermittently working.

Symptom:
Close trunk lid manually (my car is manual) and when lid makes contact with motorized latch on body nothing happens - no motor sound.. nothing. Lid will not latch and squeeze tight.

Researched forum and others and then went to dealer for the likely needed part. Parts person at dealer agreed it was the lid latch assembly. He claimed there is a chip integrated within that is necessary. WOW! ReallY?

I installed new assembly into trunk lid and then dissected the old part and found nothing electronic looking whatsoever.

Disposition: New lid latch assembly FIXED the symptom.
Cost from dealer: Lid latch assembly - $62 USD including tax.

Since then, I saw Mishar's note below and checked that too as a precaution. Yes, there is a spring and if broken could cause the same symptom. Wasn't true in this instance however, it is VERY ECONOMICAL fix if it's the problem.

Quote:
Originally Posted by mishar View Post
It also could be the small spring in the bottom part broken. If you open it you will see it. It is easy to fix.
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Old 01-27-2014, 11:13 AM   #20
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Quote:
Originally Posted by smithrd8003 View Post
For what it's worth...
Mine was intermittently working.

Symptom:
Close trunk lid manually (my car is manual) and when lid makes contact with motorized latch on body nothing happens - no motor sound.. nothing. Lid will not latch and squeeze tight.

Researched forum and others and then went to dealer for the likely needed part. Parts person at dealer agreed it was the lid latch assembly. He claimed there is a chip integrated within that is necessary. WOW! ReallY?

I installed new assembly into trunk lid and then dissected the old part and found nothing electronic looking whatsoever.

Disposition: New lid latch assembly FIXED the symptom.
Cost from dealer: Lid latch assembly - $62 USD including tax.

Since then, I saw Mishar's note below and checked that too as a precaution. Yes, there is a spring and if broken could cause the same symptom. Wasn't true in this instance however, it is VERY ECONOMICAL fix if it's the problem.
Same for me when I experienced this issue, replaced the lid latch assembly and all is fair with the universe since then. As suggested easy fix.
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Old 01-27-2014, 11:13 AM
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