MQB Webasto or Eberspächer parking heater retrofit

Tutorial made while retrofitting Webasto into Audi S3 8V, which shouldn't be supported.

Webasto has two main functions:

• Parking heater (warm up the cabin before starting the engine)
• Auxiliary heater (help warm up the engine faster while engine is working)

It can also be used to ventilate the car when it's hot. Not sure if the logic behind this feature is in the heater module or in Climatronic itself.

Research

Schematics

Webasto aux heater system contains couple elements:

• Webasto heater unit with water circulation pump, exhaust, and intake
• fuel dosing pump with fuel lines
• water hoses
• wiring harness
• remote start receiver with antenna
• remote control

Webasto unit communicates with related modules like infotainment unit (Audi MMI, VW Discover, Seat Navi...), HVAC (Climatronic). It will also checks ambient temperature, car battery charge, and car fuel level, ambient temperature.

Parts

Audi A3 8V webasto retrofit OEM kit

Retrofit kit for Audi A3 8V is available as a whole set of needed parts and accessories:

• 8V0-054-960-E - TDI, front-wheel drive (PR-1X0)
• 8V0-054-960-D - TDI, all-wheel drive (PR-1X1)
• 8V0-054-965-C - 2.0 TFSI, front-wheel drive (PR-1X0)
• 8V0-054-965-D - 2.0 TFSI, all-wheel drive (PR-1X1)
• 8V0-054-965-E - 1.0, 1.4, 1.5 TFSI, front-wheel drive (PR-1X0)

I can't see an option for 1.8 TFSI, but I assume that it will be the same as for 2.0 TFSI, since both engines are from EA888.3 family and share most of the components.

Audi S3 (8V) 2.0TFSI extra radiator on the right side

Note: no option for Audi S3 and Audi RS3. The radiator on the right side is taking the space that normally would be available for the Webasto unit. Also the washer fluid reservoir is relocated to the right side of the vehicle, which obstructs the path for water hoses. In case of Audi RS3, you have some room in the engine bay, because the 12V battery is relocated to the trunk. In case of Audi S3, you can use an aftermarket cold-air intake system for your engine, and use some of the space from the OEM air box to fit the Webasto unit. Other option is to remove the upper part of the washer fluid reservoir (it splits into two parts) and install the Webasto unit there.

Webasto Heater

There are two versions of the Webasto Thermo Top Evo heater unit:

• Diesel (Thermo Top Evo D)
• Petrol (Thermo Top Evo B)

Telestart Module

• 4H0-963-271-E - Audi Telestart module by Eberspächer.

Antenna

There's a fakra connector on the Telestart module. If Audi A3 is factory fitted with Webasto, module is connected with the roof antenna module. For retrofit there's an additional antenna that you can stick to the cars body.

Cheap generic antenna from AliExpress works just fine. If there's a change of accessing bottom the OEM roof antenna, I would love to wire the module to it. I believe the roof antenna will provide better signal and higher remote range.

Remote

There's couple of remotes that you can use. Of course Audi/Porsche/Bentley has the coolest one, with the display and more options. Other remotes (VW, Skoda, Seat...) are simpler, with just two buttons, no display, and status indicator LED.

• 4N0-963-511 - Audi, two buttons
• 4H0-963-511-A/B - Audi, 4 buttons, red backlight (Eberspächer EasyStart R+)
• 4H0-963-511-C/D - Audi, 4 buttons, white backlight (Eberspächer EasyStart R+) by Eberspächer
• 3G0-963-511-D - VW, two buttons
• 7N0-963-511-B - VW, two buttons (T91R)
• 8K0-963-511 / 7E0-963-511-B - Audi, two buttons

Wiring kit

I've got one of those, new:

• 8V0-054-931 - wiring installation kit for Audi A3 8V. (8V0-054-931)

Paid ~€50 for it. And it contains a lot of little things that I believe will be necessary during the installation.

Fuel pump and fuel line

OEM fuel tank pump assembly is prepared to connect additional line to it. Also the fuel tank is equipped with a small hanger on the side to install the webasto fuel pump.

Fuel line needs to be guided through, all the way to the engine bay.

Coolant pipes

If installing in unsupported vehicle, you will need a generic silicone hose, 20mm inner diameter.

Installation

OEM installation tutorial was available to download:

• https://pim.audi.com/pdf/EBA/EBA_8V0054960B_pl_190315.pdf
• https://pim.audi.com/pdf/EBA/EBA_8V0054960B_en_190315.pdf

When it comes to fitting Webasto unit into Audi S3, I had to remove the units exhaust, units intake, circulation pump, and both mounting brackets. Webasto unit alone has a compact shape and fits under the OEM air filter box. It will also require to use an universal exhaust once the unit is mounted and some modifications for fuel line and wiring.

Coding & Adaptation

Gateway

Configure gateway so it knows that there's new hardware and how to handle it.

//Add new module
Gateway (0x19) → Adaptation → Installation list → (Auxiliary Parking Heater) Node 0x6A → coded

//Let know the Efficiency Board Computer to calculate its thing
//with the park heater in mind. Most likely this also adds
//the parking heater to the fuel efficiency live tips
Gateway (0x19) → Long Coding → Byte:13 → Bit: 2 (BCmE Standheizungsberechnung) → Active

Webasto Heater

//coding A315 works for my Audi S3 8V
Aux. Heater (0x18) → Long Coding → Byte 0 → Bit: 0 (Low Voltage Cut-Out) → 0 (internal) / 1 (energy management)
Aux. Heater (0x18) → Long Coding → Byte 0 → Bit: 1 (Circulation Pump) → 0 (via CAN-BUS) / 1 (direct)
Aux. Heater (0x18) → Long Coding → Byte 0 → Bit: 2 (Coolant Changeover Valve) → 0 (not installed) / 1 (installed)
Aux. Heater (0x18) → Long Coding → Byte 0 → Bit: 3 (Fresh Air Blower) → 0 (via CAN-BUS) / 1 (direct)
Aux. Heater (0x18) → Long Coding → Byte 0 → Bit: 4-5 (Remote Control) → 00 / 01 / 10 / 11

Body Control

//let's make sure that the interior monitoring sensors
//will not freak out by the air movement made by the air blower
BCM (0x09) → Adaptation → Anti-theft device → Parking heater → installed

Engine

Engine (0x01) → Long Coding → Byte:03 → Bit: 3 (Auxiliary/Cabin Heater [PR-9M9]) → Installed

Climatronic

Let climatronic know that there's an additional hardware that takes role in the heating function.

//Auxiliary heater functionality
Climatronic (0x08) → Long Coding → Byte: 05 → Bits: 4-7 (aux heater) → 4x (fuel parking heater installed)

//Parking heater functionality
Climatronic (0x08) → Long Coding → Byte: 06 → Bits: 0-3 (parking heater) → x1 (installed)

Infotainment

Enable aux heater submenu in CAR settings to control timers, duration, modes...

//communication between infotainment and heater over BAP
Infotainment (0x5F) → adaptation → Car Function List BAP Gen2 → auxiliary heating 0x03 → activated
Infotainment (0x5F) → adaptation → Car Function List BAP Gen2 → auxiliary heating 0x03 msg bus → comfort data bus

//enable new submenu and set the rule for it to be available while vehicle is moving
Infotainment (0x5F) → adaptation → Car Function Adaptations Gen2 → menu display auxiliary heating → activated
Infotainment (0x5F) → adaptation → Car Function Adaptations Gen2 → menu display auxiliary heating over threshold high → activated

Basic Settings

Remote pairing

Heater (0x18) → Basic settings → Adapting RF transmitter (IDE06650) → Go!
//now press and hold the OFF button (two button remote without display)
//or the heating button (four button remote with display).

Alternative method allows to pair the remote without diagnostic interface. Disconnect the Telestart module, reconnect it, and press&hold the OFF button on the remote.

Heater unlock

Heater (0x18) → Basic settings → Disengaging heater (IDE06654) → Go!
Heater (0x18) → DTC Fault Codes → Clear Fault Codes

Demo

TODO

Costs

• Aux heater unit (with circulation pump)= 760 PLN (used)
• Wiring kit = 219 PLN (new)
• Telestart module = 180 PLN (new)
• Telestart remote = 92 PLN (used)
• Telestart antenna = 10 PLN (new, AliExpress)
• Fuel pump (with tank straw) = 299 PLN (new, OEM)
• Fuel line + quick release connectors = 50 PLN (new, AliExpress)
• Exhaust muffler + exhasut flex pipe = 30 PLN (new, AliExpress)
• Universal coolant hose (20mm inner diameter) = 35PLN (new)

Total: 1675PLN

Research & Reference

• https://www.drive2.ru/l/462004891460567069/