A8 / S8 (D3 Platform) Discussion Discussion forum for the D3 Audi A8 produced from 2003-2010 and Audi S8 produced from 2006-2010
Sponsored by:
Sponsored by:

Trunk Open and Close Remotely

Thread Tools
 
Search this Thread
 
Old 04-24-2017, 07:06 PM
  #1  
2015 A8L TDI
Thread Starter
 
Dville's Avatar
 
Join Date: Mar 2017
Location: South Florida
Posts: 381
Received 86 Likes on 64 Posts
Default Trunk Open and Close Remotely

I upgraded my trunk motor to the H metal bodied one and it started working as it was designed to with no mods to the hinge or internal clutch.

I then added a relay to have remote trunk open and close from inside car and with remote. Nice feature.

New used and old plastic motor
Soldering wires to relay. Added a diode to the relay coil to prevent backfeed to latch circuit
Heat shrink wiring
No cutting of factory harness.
Friction fit the wire into the connector and zip tied

Connected at latch and to center wires of push button.
Secured relay to prevent rattling

Last edited by Dville; 04-24-2017 at 08:51 PM.
Old 04-24-2017, 07:17 PM
  #2  
2015 A8L TDI
Thread Starter
 
Dville's Avatar
 
Join Date: Mar 2017
Location: South Florida
Posts: 381
Received 86 Likes on 64 Posts
Default

https://vimeo.com/214611696 https://vimeo.com/214610840

Last edited by Dville; 04-24-2017 at 07:42 PM.
Old 04-25-2017, 07:24 AM
  #3  
AudiWorld Member
 
Turbo Tony's Avatar
 
Join Date: Apr 2015
Location: London, UK
Posts: 111
Received 0 Likes on 0 Posts
Default

Love that mod, well done!
Old 04-25-2017, 12:15 PM
  #4  
Audiworld Junior Member
 
JGiardino89's Avatar
 
Join Date: Dec 2016
Location: Boston
Posts: 59
Likes: 0
Received 0 Likes on 0 Posts
Default

I am going to need to do this....
Old 04-25-2017, 01:35 PM
  #5  
AudiWorld Member
 
91quattro's Avatar
 
Join Date: Apr 2009
Location: Tucson, AZ
Posts: 485
Received 23 Likes on 23 Posts
Default

Has anyone done a writeup/instructions on this key/relay mod? Looks like a cool thing to do. Plus that H motor in the video...the trunk opens and closes with authority...I need to get one of those.
Old 04-25-2017, 04:21 PM
  #6  
2015 A8L TDI
Thread Starter
 
Dville's Avatar
 
Join Date: Mar 2017
Location: South Florida
Posts: 381
Received 86 Likes on 64 Posts
Default

Find a Bosch relay or any automotive relay with 4-5 pins.
Most have numbering on the pins.

Basically you are using the trunk LATCH wires to activate the TRUNK open button

85 - Ground for relay coil - Brown wire on LATCH
86 - Positive 12V for coil - Green wire on LATCH

30 - Common contact of relay -Inside Brown wire on Trunk Button
87 - Normally OPEN contact of relay - Inside Green wire on Trunk Button

(the white striped wire on the latch is to let the car know the trunk is closed, we don't connect anything to this wire)

When 12v is applied to 86, and 85 is grounded the relay activates and internally connects pins 30 to pin 87.
Old 04-26-2017, 04:15 PM
  #7  
Audiworld Junior Member
 
flg8r90's Avatar
 
Join Date: Jun 2012
Posts: 47
Likes: 0
Received 0 Likes on 0 Posts
Default

Where did you find the motor ? Where are in located in Florida ? I'm in south end of PB County.
Old 04-26-2017, 05:08 PM
  #8  
2015 A8L TDI
Thread Starter
 
Dville's Avatar
 
Join Date: Mar 2017
Location: South Florida
Posts: 381
Received 86 Likes on 64 Posts
Default

Originally Posted by flg8r90
Where did you find the motor ? Where are in located in Florida ? I'm in south end of PB County.
I got motor from Ebay seller in New York.
I am in Royal Palm Beach, FL
Old 05-14-2017, 09:45 AM
  #9  
AudiWorld Member
 
91quattro's Avatar
 
Join Date: Apr 2009
Location: Tucson, AZ
Posts: 485
Received 23 Likes on 23 Posts
Default

+1 on the H motor. After years of dinking around with this issue, the trunk finally works as it should have from day one. I have tried replacing the "bent" passenger hinge, lubricated the hinges, tried the spring fix in the left corner, tried replacing the struts. Considered the solder paste or sanding wheel solutions. No combination of these really solved the problem. The best I could get was that I always had to "help" the trunk open and close, and it always seemed to me that the motor didn't have quite enough torque.

I was lucky enough to find an H motor on ebay at the staggering price of $31 plus $33 shipping. $64 delivered. It was not guaranteed to work, but other than the motor itself, what can go wrong with these? It's a magnetic clutch - no physical contact. So I opened it up, cleaned all the surfaces, lubed the plastic bearings surfaces and gears, buttoned it up and put it in the car. Works like a charm. I also used HHS-V on the hinges - that made trunk operation almost silent.

Next step is this relay mod.
Old 05-16-2017, 11:44 AM
  #10  
AudiWorld Member
 
91quattro's Avatar
 
Join Date: Apr 2009
Location: Tucson, AZ
Posts: 485
Received 23 Likes on 23 Posts
Default

How did you wire the diode - is it connected to pin 85?


Quick Reply: Trunk Open and Close Remotely



All times are GMT -8. The time now is 06:58 AM.