GOLFMK8
GOLFMK7
GOLFMK6
GOLFMKV
FORUM OPTIONS
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Go Back   GOLFMK7 - VW GTI MKVII Forum / VW Golf R Forum / VW Golf MKVII Forum > Technical Topics > DIY Guides and Discussions


Reply
 
Thread Tools Display Modes
Old 07-27-2016, 11:57 PM   #1
flip7
Senior Member
 
Drives: mk7 GTI 4 dr SE + LP
Location: Austin TX
Join Date: Jul 2016
Posts: 260
Third brake light flasher - where to install ?

Howdy,

I want to make the third brake light flash when braking, and AFAIK is not doable via VCDS (please chime in if I am wrong)

so I want to install a $5 electronic flasher module which is about the size of a matches box.

Question is where I can install it, where I can pigtail the wires which go to the third brake light.

Any advise?

Thanks
flip7 is offline   Reply With Quote
Old 08-03-2016, 12:43 PM   #2
The Fed
Senior Member
 
The Fed's Avatar
 
Drives: 2016 Golf R
Location: Florida
Join Date: Dec 2012
Posts: 10,125
I think you can make it flash via VCDS, but only for panic stopping. I think NAR cars are not coded to allow it.

I think installing a flasher will render the light inoperative and give you an MFD error message.

I think it's illegal in the U.S. to operate a automobile with flashing red rear lights while the vehicle is in motion without a permit from the police.

I think you should research federal, state, and local motor vehicle regulations.
__________________
(Mostly) Posted by Josh/AWE. Flapper valves are open at idle, close after 1100 RPM during part throttle. Full throttle 1st-4th gear the valves open until throttle let off. 4th gear, 1500 RPM to full throttle closed, closed until 3500 RPM, then open until lift off throttle.

Last edited by The Fed; 08-03-2016 at 12:50 PM.
The Fed is offline   Reply With Quote
Old 08-03-2016, 01:23 PM   #3
flip7
Senior Member
 
Drives: mk7 GTI 4 dr SE + LP
Location: Austin TX
Join Date: Jul 2016
Posts: 260
I had one on my previous vw jetta and it always passed inspection. Indeed to make it work someone need to build a rectifier curcuit as that is a rectangle signal

Sent from my SM-G930T using Tapatalk
flip7 is offline   Reply With Quote
Old 08-03-2016, 01:24 PM   #4
flip7
Senior Member
 
Drives: mk7 GTI 4 dr SE + LP
Location: Austin TX
Join Date: Jul 2016
Posts: 260
Anyone knows how to get to the wire harness for the third brake light?

Sent from my SM-G930T using Tapatalk
flip7 is offline   Reply With Quote
Old 08-05-2016, 07:57 PM   #5
VWGTI
Senior Member
 
VWGTI's Avatar
 
Drives: 2015 VW GTI Mk7 LP, 2018 Subaru STI VA
Location: Irvine, California
Join Date: Aug 2015
Posts: 567
I want this too, where can you get the unit that allows the flashing?
__________________
2015 Carbon Steel Gray GTI | GIAC Stage 2 Tune | Milltek Cat-Back Exhaust | CTS Turbo 3.5" Downpipe | VWR Sport Springs | 034 Rear Sway Bar | Adjustable Rear Endlinks | Neuspeed RSe10 | Michelin PSS | Helix Euro LED Brake Lights | DeAutoLED Reverse Lights
VWGTI is offline   Reply With Quote
Old 08-22-2016, 11:04 PM   #6
flip7
Senior Member
 
Drives: mk7 GTI 4 dr SE + LP
Location: Austin TX
Join Date: Jul 2016
Posts: 260
So here it is - finally

I managed to get it working ... no errors or error lights

The flasher module needs a rectifier circuit 1 diode and a capacitor

Amazon sells these flashers for ~$5
rest of the components ~$3

here is the youtube with the final result:
Link
flip7 is offline   Reply With Quote
Old 08-23-2016, 07:39 AM   #7
VWGTI
Senior Member
 
VWGTI's Avatar
 
Drives: 2015 VW GTI Mk7 LP, 2018 Subaru STI VA
Location: Irvine, California
Join Date: Aug 2015
Posts: 567
Quote:
Originally Posted by flip7 View Post
I managed to get it working ... no errors or error lights



The flasher module needs a rectifier circuit 1 diode and a capacitor



Amazon sells these flashers for ~$5

rest of the components ~$3



here is the youtube with the final result:

Link

Do you have a tutorial?
__________________
2015 Carbon Steel Gray GTI | GIAC Stage 2 Tune | Milltek Cat-Back Exhaust | CTS Turbo 3.5" Downpipe | VWR Sport Springs | 034 Rear Sway Bar | Adjustable Rear Endlinks | Neuspeed RSe10 | Michelin PSS | Helix Euro LED Brake Lights | DeAutoLED Reverse Lights
VWGTI is offline   Reply With Quote
Old 08-23-2016, 01:42 PM   #8
flip7
Senior Member
 
Drives: mk7 GTI 4 dr SE + LP
Location: Austin TX
Join Date: Jul 2016
Posts: 260
Tutorial

As with everything - I am not responsible for whatever you end up with - as a result of this guide.

1) remove the interior trim from the top of the hatch (pull it up / towards you). Gets off quite easy

2) Find the wires going to the flasher - see pic;
2.a) determine the positive wire with a multi-meter.
2.b) cut the positive wire. Beware where you cut it, in case you cut it too short it will be hard to get in there and correct this. You will need to be able to solder and isolate the wires from the flasher module to the wire you cut!

3) Install flasher module; use double adhesive tape to stick things to the body.

With the flasher I got, it required an external rectifier circuit - 1 diode + 1 capacitor

4) Test it

5) put everything back & enjoy.
Attached Images
 
flip7 is offline   Reply With Quote
Old 08-23-2016, 03:34 PM   #9
vidman
Senior Member
 
Drives: 2015 R DSG + 2013 GTi pp
Location: Nr Wellingborough
Join Date: Sep 2013
Posts: 178
Can you put up a diagram of the rectifier module, showing how to connect it in circuit
__________________
2015 Golf R DSG, Limestone Grey, DCC, Tech Pack, Winter Pack, Reversing Camera
vidman is offline   Reply With Quote
Old 08-23-2016, 05:56 PM   #10
flip7
Senior Member
 
Drives: mk7 GTI 4 dr SE + LP
Location: Austin TX
Join Date: Jul 2016
Posts: 260
Quote:
Originally Posted by vidman View Post
Can you put up a diagram of the rectifier module, showing how to connect it in circuit
Indeed
Attached Images
 
flip7 is offline   Reply With Quote
Old 08-24-2016, 05:00 PM   #11
dongdong
Member
 
Drives: mk7 gti s
Location: sf bay area
Join Date: Dec 2014
Posts: 46
i have this one,

http://www.3rdbrakeflasher.com/brake...del-p-181.html

it doesnt throw a code when its being used, but when you short the two white wires for set up it does. it goes away when you restart the car. super easy install

heres a video for mine, you can barley notice it in the video, but its pretty noticeable when youre behind me.

good luck
dongdong is offline   Reply With Quote
Old 08-25-2016, 08:32 PM   #12
flip7
Senior Member
 
Drives: mk7 GTI 4 dr SE + LP
Location: Austin TX
Join Date: Jul 2016
Posts: 260
Quote:
Originally Posted by dongdong View Post
i have this one,

http://www.3rdbrakeflasher.com/brake...del-p-181.html

it doesnt throw a code when its being used, but when you short the two white wires for set up it does. it goes away when you restart the car. super easy install

heres a video for mine, you can barley notice it in the video, but its pretty noticeable when youre behind me.

good luck
You did not post the video ???

BTW - did you had to use an external rectifier circuit, or not?
flip7 is offline   Reply With Quote
Old 08-28-2016, 04:21 AM   #13
dongdong
Member
 
Drives: mk7 gti s
Location: sf bay area
Join Date: Dec 2014
Posts: 46
Quote:
Originally Posted by flip7 View Post
You did not post the video ???

BTW - did you had to use an external rectifier circuit, or not?
oops sorry,

heres the video link:

https://www.youtube.com/watch?v=Be04K5aT_Zg

I did not, use a rectifier circuit. all i did was splice the wire and solder it on. let me know if you have any questions
dongdong is offline   Reply With Quote
Old 08-29-2016, 07:51 PM   #14
flip7
Senior Member
 
Drives: mk7 GTI 4 dr SE + LP
Location: Austin TX
Join Date: Jul 2016
Posts: 260
Quote:
Originally Posted by dongdong View Post
oops sorry,

heres the video link:

https://www.youtube.com/watch?v=Be04K5aT_Zg

I did not, use a rectifier circuit. all i did was splice the wire and solder it on. let me know if you have any questions
I think the effect is not so crisp (at least from the video) because the signal from the brake light wire is likely a 100Hz rectangle signal with some duty cycle which is meant to adjust the LED intensity.

Your install may benefit from a rectifier circuit. Next time I open mine up, I will put a scope on that brake wire to confirm. On an older Jetta this was definitely the case.
flip7 is offline   Reply With Quote
Old 10-31-2017, 02:00 PM   #15
c3156
Senior Member
 
c3156's Avatar
 
Drives: 07 GTI, 09 TDI (Gone), 17 GTI Sport
Location: East Coast, USA
Join Date: Aug 2017
Posts: 134
Okay, so I installed THIS third brake light flasher and I built a rectifier circuit similar to the one posted by @flip7.

The flasher works great but I still get a error on the third brake light. Any ideas on what I may have done wrong? Is it possible to install a capacitor backwards?

Thanks!
c3156 is offline   Reply With Quote
Old 11-03-2017, 06:41 PM   #16
flip7
Senior Member
 
Drives: mk7 GTI 4 dr SE + LP
Location: Austin TX
Join Date: Jul 2016
Posts: 260
Quote:
Originally Posted by c3156 View Post
Okay, so I installed THIS third brake light flasher and I built a rectifier circuit similar to the one posted by @flip7.

The flasher works great but I still get a error on the third brake light. Any ideas on what I may have done wrong? Is it possible to install a capacitor backwards?

Thanks!
I do not remember getting an error or having to code anything. The capacitor may not like if installed backwards
What code you are getting? Try resting it with vcds and see if it comes back

Sent from my SM-G930T using Tapatalk
flip7 is offline   Reply With Quote
Old 11-05-2017, 11:40 PM   #17
c3156
Senior Member
 
c3156's Avatar
 
Drives: 07 GTI, 09 TDI (Gone), 17 GTI Sport
Location: East Coast, USA
Join Date: Aug 2017
Posts: 134
Quote:
Originally Posted by flip7 View Post
I do not remember getting an error or having to code anything. The capacitor may not like if installed backwards
What code you are getting? Try resting it with vcds and see if it comes back
I am getting a third brake light error, my mistake for not checking the true code with VCDS. But the flasher works.

I tried an experiment and disconnected the rectifier circuit and the error went away. But the flasher does not work

So I will make another rectifier. What is the correct direction to install a capacitor? Does the (-) go to the negative side? I am not an electronics guy, but I can follow directions.
c3156 is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 10:36 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.