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

Add module to Gateway

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

Now you can check if the trailer module is available

0x69 → Coding

Adjust tow bar module coding

TODOoo

Let rest of the car know about new feature

Let's start 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

Now ABS/ESP

0x03 → 1 → 7 → installed

Body Control Module

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

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)

Adaptive Cruise Control

0x13 → LongCoding → Control Module for Towing → installed

Instrument Cluster also needs to know about the trailer.

0x17 → LongCoding → TODOoo

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

0x3C → Long Coding → TODOoo

Rear View Camera should start in the Trailer Mode if the trailer is connected.

0x6C → Long Coding → TODOoo

Electric trunk door? Let's let it know that there might be an obstacle behind the car

0x6D → Long Coding → Trailer → installed

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 → TODOoo