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Discussion Starter · #1 ·
Hi Everyone,

I have a 2014 Touareg TDI. I just bought an enclosed trailer with trailer brakes that uses the 7-way connector. The trailer has led lights. I'm aware that the connector needs to sense a load in order to power the lights.

Further, I plan to use a Curt bluetooth wireless brake controller with the touareg. I have the device but it doesn't have resistors inside to allow the car to detect the trailer. There are 7 way plugs with resistors that exist but if I double this up with the curt device it will be unweildy and dragging on the ground.

I've attempted to add resistors inside the 7-way plug. I tried 100 ohm between ground, left turn, right turn, and running lights. That did not work. I tried 50 ohm and finally 10 ohm resistors. None of these allowed the car to recognize the trailer which doesn't make sense to me. I feel like 10 ohms would draw 1.2 amps which should easily simulate an incandescent bulb. Can anyone tell me what is not sound about my logic?
 

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Discussion Starter · #7 ·
Address 69: Trailer (J345) Labels: Redir Fail!
Part No SW: 7P0 907 383 F HW: 7P0 907 383 B
Component: Anhaenger H09 0110
Revision: 5A001001 Serial number: 00000147064192
Coding: 020D000000000000
Shop #: WSC 56647 001 1048576
VCID: 3B2332BE836C8793DAD-806E
 

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Discussion Starter · #9 ·
Also getting these faults:

Tuesday,22,November,2022,07:17:30:37492
VCDS Version: Release 22.3.1 (x64) Running on Windows 10 x64
www.Ross-Tech.com

Address 69: Trailer Labels: Redir Fail!
Control Module Part Number: 7P0 907 383 F HW: 7P0 907 383 B
Component and/or Version: Anhaenger H09 0110
Software Coding: 020D000000000000
Work Shop Code: WSC 56647 001 1048576
VCID: 3B2332BE836C8793DAD-806E
4 Faults Found:

02579 - Trailer; Left Brake Lamps (M65)
010 - Open or Short to Plus - MIL ON
Freeze Frame:
Fault Status: 11101010
Fault Priority: 3
Fault Frequency: 1
Reset counter: 86
Mileage: 221811 km
Time Indication: 0
Date: 2022.10.01
Time: 20:51:32

00335 - Control Circuit Taillights
007 - Short to Ground - MIL ON
Freeze Frame:
Fault Status: 11100111
Fault Priority: 3
Fault Frequency: 1
Reset counter: 86
Mileage: 221812 km
Time Indication: 0
Date: 2022.10.01
Time: 21:02:50

02580 - Trailer; Right Brake Lamps (M66)
010 - Open or Short to Plus - MIL ON
Freeze Frame:
Fault Status: 11101010
Fault Priority: 3
Fault Frequency: 1
Reset counter: 86
Mileage: 221812 km
Time Indication: 0
Date: 2022.10.01
Time: 21:03:31

00532 - Supply Voltage B+
011 - Open Circuit - MIL ON
Freeze Frame:
Fault Status: 11101011
Fault Priority: 3
Fault Frequency: 2
Reset counter: 140
Mileage: 221812 km
Time Indication: 0
Date: 2022.10.01
Time: 21:06:33
 

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Discussion Starter · #12 ·
Soot, it's a 47 ohm resistor with 5% tolerance (i.e. I called it a 50 ohm). V=IR so putting it in parallel should draw a quarter amp or so.

More updates. Found that the 15amp fuse to the trailer was blown. I was having issues with my other trailer as well which usually works fine so I believe this fuse was blown before I started messing with the trailer in question. I replaced the fuse, plugged the 7 way connector into the touareg and didn't get any lights. Only dim flickering on the tail lights and license plate lights. I believe this is the vehicle trying to sense the lights. Then.....

I unplugged and replugged the connector and the lights worked! Everything seemed to work great. Then I unplugged and replugged and I got the flickering again and no lights. I added a single 100ohm resistor to the left turn signal light and plugged it in and the lights worked. unplugged and replugged and I got the flickering again. I then added resistors to the right turn signal and tail lights and got the same behavior.

Not sure why it's not registering every time, even if I add a load to the circuit. Other thoughts are there is a 12v battery in the trailer that connects to the touareg thru the 7-way plug. This charges the battery when trailering, maybe this is interfering but I don't really think it would make a difference. Perhaps there is a proper sequence to get the trailer to register (i.e. start the car then connect trailer, or connect trailer then start car). I will play with it more tonight....

Below are pictures of the leds slightly on/flickering. Hard to see in the pics...
 

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Discussion Starter · #14 ·

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Discussion Starter · #19 ·
Hi All,

I think I figures it out. If i plug the end of the 7 way plug in without the outer sheath it works great. When i put the outer sheath around the plug and plug it in it doesn't work. I think the outer sheath is hitting the connector. I'm going to replace the 7 way plug on the trailer and hopefully that fixes it. I can plug and unplug every time and it works if I remove the outer sheath. If I add it it doesn't work. Will report back one final time if that's it. There is a set screw and it deformed the outer sheath and I think that's the issue.
 

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Discussion Starter · #22 ·
What does the brake controller have to do with trailer bulb out issues? They are two separate systems, TBC output goes directly to the 7-way, does not interface with the Touareg trailer module.

I can confirm that the curt trailer brake controller fits into the touareg fine, and that without the outer shell on the 7 way plug I get lights and functionality thru the trailer lights. If I add the shell around the 7 way trailer plug and go into the curt device the lights didn't work properly.

The red herring is that the tail lights and all the lights flicker like the touareg is trying to sense the lights with the shell around the 7 way plug. So it must be making contact but not fully plugging in.

Anyway, new plug goes on tonight. Appreciate all the help everyone.
 
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