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Old October 30th, 2011, 16:58   #1
n9lhm
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Default door switch location

2002 Jetta, dome light only comes on intermittently when driver's door is opened, and never when passenger door is opened, and door ajar warning does not illuminate. When either back door is opened, dome light comes on and door ajar is displayed on the dash. Where is the door open sense switch for the front doors located? Any suggestions on how to access it easiest? Or does anyone have any experience with this symptom being something else? (I did see the thread about broken wires in the flex boot in the door jamb)

Brian
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Old October 30th, 2011, 18:56   #2
Vince Waldon
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Search yea the "$3 door fix" thread... it's about a hundred pages long and has great pictures, discussion, etc.
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Old October 31st, 2011, 11:01   #3
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Quote:
Originally Posted by n9lhm View Post
... Where is the door open sense switch for the front doors located? Any suggestions on how to access it easiest? ...
The referenced thread is very good. It should point you to a couple of threads on this problem (on vwvortex, no less), with lots of discussion on different sets of symptoms and what to do to fix them.

In short, the switches you need are in a latch mechanism buried inside the door. There's 4 switches, but the upside is that most of the time, it is bad solder joints rather than switches going bad, that cause most of the problems encountered.

Good luck, and hopefully you won't have to buy anything unless you don't already have a soldering iron.

Cheers,

PH
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Old October 31st, 2011, 13:18   #4
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Quote:
Originally Posted by Powder Hound View Post
but the upside is that most of the time, it is bad solder joints rather than switches going bad, that cause most of the problems encountered.
I dunno Eric, I'm pretty sure the vast majority of failures are the switch itself. The little plastic nub that the door cam rotates against is basically a miniature version of the Whac-A-Mole game and it just can't hold up in the long term.

But you're right there is a solder joint problem on the circuit board in the lock module, but I only hear it being an issue infrequently compared to the switch.

If the OP doesn't feel like reading a mountain, here's a printable HOW_TO I put together, mostly with existing information:
http://forums.tdiclub.com/showpost.p...&postcount=379

PS: Salisbury! Good to see the wheel bearing tools moving closer for the next time one goes!!
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Old November 1st, 2011, 13:06   #5
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True that the switch itself can fail. I am not going to claim I know about all the failures and how many are due to switch failures or just solder joints. There are 4 switches inside the module, and hopefully visual examination will tell whether a switch is dead or that intermittent problem is a flaky solder fracture. Mine so far have all been solder fractures.

Yeah, I'm probably 10 miles closer to New London than previously. But while I can work where the cars are parked now, I still don't have a garage, so ...

Good thing coming from that direction (north) is that a GPS will work. They don't have my address correctly mapped, so if you are coming from the south, you will be led onto a virtually impassable road. Sometimes new technology isn't quite everything it is supposed to be!
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Old November 2nd, 2011, 09:47   #6
n9lhm
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Thanks for the replies, I do electronic repair for a living so replacing the switch is not a problem. Just curious -- what actuates the switch mechanically? Something has to sense whether the door is touching the door jamb or not -- it's not a door lock sensor, per se..........
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Old November 2nd, 2011, 10:14   #7
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There's levers and other moving parts in the latch/lock mechanism that actuate the switches. You are correct in that the switch itself isn't hitting the door jamb. Some engineer had to think about that mechanism for a while.
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VW does not build or sell cars. VW builds and sells mobile DIY kits disguised as cars.
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