You CAN replace the 'Door Open' micro-switch in the door latch.

JustJeff · 05-30-2006, 05:13 PM

After a spirited drive through the winding roads of the Minnesota Farmland on Saturday, I set up Sunday AM to wash off the bugs and dust.
After that, I experienced 2 classic TT problems.
Within 5 minutes of each other, and in my driveway, the brake light switch failed, as an intermittent, and the passenger door switch failed.
The display showed the passenger door as always `open'
I got the brake switch today, and tackled the door switch tonight.
I'm proud to say it can be fixed, and dismayed to find out, once again, Audi chose an inferior part, made in France, for this sub-standard switch.

Here is the culprit after removing the door latch assembly.
Piece of crap small plastic plunger broke apart inside the switch.

The switch is mounted at the top, open end of the door latch assembly.

The switch mounts in those 2 holes.
You can see this cam-type acuator here, that pushes the switch button in, as the door is closed.

I rummaged through my parts-bins, and came up with an industry-standard micro-switch that has stood the test of time as my replacement. I'll bet I could take this switch and substitute it in any major factory machine still in use today, and it would work. I'll bet this switch has been in my parts-bin for 20 years. Why Audi chose to use such a cheap switch is beyond me. This one will out-last the car I suspect.
I had to drill a new hole to mount it 90 degrees from the Audi one, and them I will epoxy it in place.

Here it is mounted and wired.

Here it shows the cheap-o switch in the same plane as it was orignally installed, with the new one, screwed in and epoxied in place.

Here it is mounted and in place.

I tested this and it works, and I'm re-installng it now.

TTinCT · 05-30-2006, 05:19 PM

TT_Nuge · 05-30-2006, 05:19 PM

HugeTTs · 05-30-2006, 05:30 PM

Soooomeeeewheeeereeee oveeerrr myyyyy HEAD.

kodeTT · 05-30-2006, 05:55 PM

i still wouldn't be able to DIY like you did.

MCPaudiTT - DEFCON 1 · 05-30-2006, 06:01 PM

shifTT · 05-30-2006, 06:10 PM

For future reference and for those without a parts bin. Some of these switches from Digikey look like they may work: Cherry snap switches (PDF) Page 1 figure 3, DC water and dust sealed.

MCPaudiTT - DEFCON 1 · 05-30-2006, 06:13 PM

shifTT · 05-30-2006, 06:16 PM

JustJeff · 05-30-2006, 07:28 PM

05-30-2006, 05:13 PM	#1
JustJeff Elder Member Account #: 2847 Join Date: Mar 2000 Posts: 21,786	You CAN replace the 'Door Open' micro-switch in the door latch. After a spirited drive through the winding roads of the Minnesota Farmland on Saturday, I set up Sunday AM to wash off the bugs and dust. After that, I experienced 2 classic TT problems. Within 5 minutes of each other, and in my driveway, the brake light switch failed, as an intermittent, and the passenger door switch failed. The display showed the passenger door as always `open' I got the brake switch today, and tackled the door switch tonight. I'm proud to say it can be fixed, and dismayed to find out, once again, Audi chose an inferior part, made in France, for this sub-standard switch. Here is the culprit after removing the door latch assembly. Piece of crap small plastic plunger broke apart inside the switch. The switch is mounted at the top, open end of the door latch assembly. The switch mounts in those 2 holes. You can see this cam-type acuator here, that pushes the switch button in, as the door is closed. I rummaged through my parts-bins, and came up with an industry-standard micro-switch that has stood the test of time as my replacement. I'll bet I could take this switch and substitute it in any major factory machine still in use today, and it would work. I'll bet this switch has been in my parts-bin for 20 years. Why Audi chose to use such a cheap switch is beyond me. This one will out-last the car I suspect. I had to drill a new hole to mount it 90 degrees from the Audi one, and them I will epoxy it in place. Here it is mounted and wired. Here it shows the cheap-o switch in the same plane as it was orignally installed, with the new one, screwed in and epoxied in place. Here it is mounted and in place. I tested this and it works, and I'm re-installng it now. __________________

05-30-2006, 05:19 PM	#2
TTinCT AudiWorld Super User Account #: 6744 Join Date: Jun 2000 Posts: 24,717	good stuff Jeff as always.....thanks for posting! __________________ _____________________________________ Only 29,000 posts to catch SCHWING!!! _____________________________________ TT-East Questions and Answers here TT-East ________________________________________ TT-East 2008 Primary Organizer TT-East 2007 Primary Organizer TT-East 2006 Primary Organizer TT-East 2005 Attendee CT GTG Coordinator CT MOD Day Headquarters "self proclaimed" --------------------------------------- TT-East 2008 courtesy of McPaudiTT Linky to pics of Mods,Cars and Shows Link to the TT-FAQ's...if it ain't here, then ask!!! "thou shalt not flash a Porsche to get out of the way, or be damned to breathe his exhaust for eternity" - Someone wise TRACK THOUGHT- Don't brake until you see God.... then when you do see God, count to three, then brake! AIM name - EINTT Current Automotive inventory... 2006 Mercedes Benz R350 2001 Audi TT 225 1977 Porsche 911s 1961 Porsche 356b

05-30-2006, 05:19 PM	#3
TT_Nuge Senior Member Account #: 78082 Join Date: Jul 2004 Posts: 7,079	Never cease to amaze Jeff, nice work like always. __________________ My Fotki The TT FAQ

05-30-2006, 05:30 PM	#4
HugeTTs AudiWorld Senior Member Account #: 102013 Join Date: Dec 2005 Posts: 1,021	Re: You CAN replace the 'Door Open' micro-switch in the door latch. Soooomeeeewheeeereeee oveeerrr myyyyy HEAD. __________________ Aviator/Black 01225QC Modshack Stage 3 3.2 bumper/spoiler/valance GIAC91 "Custom" Exhaust Scangauge And stuff I probably forgot.

05-30-2006, 05:55 PM	#5
kodeTT Elder Member Account #: 23258 Join Date: Jul 2001 Posts: 11,395	excellent fix. i still wouldn't be able to DIY like you did. __________________ Bill '01 Atlas Gray Tip allroad : winter package : Dahlback chip : H-Sport sway bars '01 225 TTQC : Brilliant Black TT : Ebony : Premium : Heated Seats : Bose —\| Engine \|— :: Dahlback chip :: Dahlback intake manifold :: 42 Draft Designs 3" downpipe with test pipe :: EVOshield intake gasket :: Bosch Super Copper spark plugs :: N75 K valve :: Modshack VTDA :: Modshack MoFo v.2 with Tyrol adjustable FPR :: Forge SPLTR DV :: relocated :: O.CT FMIC :: Samco hoses [intake, upper and lower] :: VF Engineering side motor and pendulum mounts :: Custom 3" Sheep/Mufflex exhaust :: Optima YellowTop battery —\| Suspension/Drivetrain \|— :: KW variant 3 coilovers : 8012 spring mod :: DieselGeek Sigma 6 short shifter upgrade :: DEFCON3 with H2S rear spherical bearings :: CPT control arms (lower) \| Forge tiebars (upper) :: Haldex race controller :: H-Sport front and rear adjustable sway bars —\| Exterior \|— :: Blindspot "Euro" mirrors :: Bosch Aerotwin wipers :: OEM roof rack [Thule bike rack] :: Audi OEM 3.2 bumper :: Audi OEM Quattro Sport Phantom Black grilles :: RISO smoke clear corners : o-gas : zero v.3 :: RISO CF arc :: Smoked Euro tail lights <Jon's Tinted Tails> :: Black sidemarkers <Jon's Tinted Tails> :: Wilwood 4-piston, 13" rotor BBK :: Summer Sandals [Toyo T-1Rs on 19" BBS LMs ET25] :: Winter Boots [Nokian WR on 19" LMs] :: ECS 12.1" rear cross drilled slotted rotors :: Hawk HPS brake pads :: StopTech SS brake lines —\| Interior \|— :: ModShack gadgeTT v.2 :: AWE Tuning boost gauge :: Hardwired Garmin nuvi 360 with gadgeTT2 :: Hardwired V1 :: PIAA H3 Super Plasma foglight and switch mod :: ice>Link v.1.1 : iPod interface :: Audi RS4 perforated steering wheel :: Audi OEM TT winter mats :: Audi OEM S-Line all aluminum shift knob :: RISO O-gas :: Britax Starriser seat in rear —\| yard sale \|— :: KMD lightweight crank pulley —\| Future Mods \|— :: Euro dash

05-30-2006, 06:01 PM	#6
MCPaudiTT - DEFCON 1 AudiWorld Super User Account #: 83654 Join Date: Nov 2004 Posts: 10,906	What all has to come out to get that latch assembly out? Inner liner? More? __________________ Got a question about your TT? Try searching the TT-FAQ! Got DEFCON? My FOTKI

05-30-2006, 06:10 PM	#7
shifTT Junior Member Account #: 75098 Join Date: May 2004 Posts: 1,399	what are the dimensions of the original switch? For future reference and for those without a parts bin. Some of these switches from Digikey look like they may work: Cherry snap switches (PDF) Page 1 figure 3, DC water and dust sealed. __________________ TT wheel spacer / offset calculator \| Audi Club BC

05-30-2006, 06:13 PM	#8
MCPaudiTT - DEFCON 1 AudiWorld Super User Account #: 83654 Join Date: Nov 2004 Posts: 10,906	Should we get a bag of a hundred and pass them out like candy?! ; ) __________________ Got a question about your TT? Try searching the TT-FAQ! Got DEFCON? My FOTKI

05-30-2006, 06:16 PM	#9
shifTT Junior Member Account #: 75098 Join Date: May 2004 Posts: 1,399	haha... door switch GB! __________________ TT wheel spacer / offset calculator \| Audi Club BC

05-30-2006, 07:28 PM	#10
JustJeff Elder Member Account #: 2847 Join Date: Mar 2000 Posts: 21,786	remove the door card, 2-12-pt screws in the door jamb,1 cable to the outer door handle, 1 elec. conn __________________

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