MQB tow bar retrofit

Supported cars

• Audi A3 (8V) MK3
• Audi Q2
• Seat Leon (5F) MK3
• Skoda Octavia (5E) MK3
• Skoda Superb
• VW Golf (5G) MK7
• VW Passat (3G) B8
• VW Arteon

Hardware

TODOoo

Wiring

TODOoo

Coding & Adaptation

Some experts decided to add module to gateway (so it works) and code it in parktronic (so the customer sees the trailer on the display). That's hardly all the modifications that are required for full integration.

Add module to Gateway

0x19 → InstallationList → add module 0x69 (Trailer Hitch module)

Now you can check if the trailer module is available in the modules list at address 0x69

Adjust tow bar module coding

0x69 → Coding

0x01 - Engine Control Module

Let rest of the car know about new feature. Starting with Engine Control Module.

Notice: actual Byte/Bit address depends on the engine that you have in your car

0x01 → LongCoding → Byte 5 → Bit 4 (Trailer Recognition installed)
//TODO: other configs for other engines

0x03 - Brakes and Stability

Now ABS/ESP, since additional weight and mass balance will impact braking performance and stability control

0x03 → 1 → 7 → installed
or
0x03 → 24 → 7 

0x09 - Body Control Module

It controls mostly lights. I believe trailer will impact things like rear fog light, maybe indicators.

Notice: around 2016/17 BCM does not use LongCoding anymore. It will be filled with 00s.

0x09 → LongCoding → Byte 1 → Bit 1 (Trailer Hitch Control Module installed)
0x09 → Adaptation → Vernetzung → anhaengeranschlussgeraet → installed

0x10 / 0x76 - Parking Sensors

Parking sensors. This will tell the module that it should expect trailer behind the car - not an obstacle.

0x10 or 0x76 → LongCoding → Byte 3 → Bit 0-1 Trailer Hitch installed - manually removable → installed

0x13 - ACC

Adaptive Cruise Control

0x13 → Long Coding → Byte ?? → Bit ? Control Module for Towing → installed

0x17 - Instrument Cluster

Instrument Cluster also needs to know about the trailer.

0x17 → Long Coding → Byte ?? → Bit ? Towing Capacity Display → Yes

0x3C - Side Assist / Blind Spot

Since you are dragging something behind your car, blind spot sensors will see it permanently. Let them know about it.

0x3C → Long Coding → Byte ?? → Bit ? ECU for Draw Bar → with

0x6C - Rear View Camera

RVC High or AreaView 360 should start in the Trailer Mode if the trailer is connected.

0x6C → Long Coding → Byte 04 → Bit 0 Trailer Control Unit (J345) → installed
0x6C → Long Coding → Byte 07 → Bit 2 Trailer Towing View → enable

0x6D - Trunk Door

Let's let it know that there might be an obstacle behind the car

0x6D → Long Coding → Trailer → installed

0xA5 - Multifunctional Assisten Camera

Multifunction camera also needs to know about the tow bar and trailer. For one, the camera will be pointing slightly higher when trailer is connected. And if you have Traffic Sing Assist or Traffic Sign Recognition it will also show you trailer-related signs.

0xA5 → Long Coding → Byte 11 → Bit 0 (AAG) → installed