Hello everyone on the forum. I'm currently facing difficulties with my FBH. After having a Webasto agent inspect it, he couldn't establish a connection with the FBH, suggesting a potential issue with the PCB/ECU with the unit. He recommended purchasing a new or reconditioned unit, which he'd then install. In my search for a replacement, I've encountered conflicting advice. Some suggest that a standalone unit won't function with my L322 and that the FBH is uniquely assigned to each vehicle. Can anyone confirm if this is accurate? Would a reconditioned unit or one from a different car be compatible with my L322? I'm uncertain about what course of action to take. While the Webasto technician assures me a new or reconditioned unit will work, others who repair these units caution that compatibility might be an issue. Your insights would be greatly appreciated before I invest £400 in a potentially non-functional replacement!

Anyone please?

Create few more topics....

On my previous 2011 D4, I had the same problem, i.e. FBH doing nothing at all and could'nt communicate with it - bought a secondhand one off eBay, replaced the ECU board within it and it worked a treat. There is no unique identifier between the vehicle and the FBH ECU (on a D4 at least).

Hope that helps

Chris

For the FBH to function as intended, you would need to replace the main board with a CANbus-enabled one from a vehicle of similar age and manufacturer. Different manufacturers use different signalling, so a BMW CANbus Webasto unit won't work with a Mercedes, LR, etc.

A non-CANbus version can be used, but will need to be controlled manually via Webasto switching, either a timer, remote control, or direct 12V control.

ETA - they're not VIN-coded to the vehicles, at least not on LR applications - although some are from other vehicle manufacturers, it's quite a rare feature on the Webasto control electronics. 2012 (L322) 4.4TDV8 Vogue SE, RSE, Fuji White over Arabica.
Previous V8s: BMW 645Ci, P38 4.6, P38 4.0, Merc CL500
Previous others: Honda x1, Volvo x7, Rover x6, BMW x6, Ford x1, Mercedes x2, Skoda x3, VW x2, Renault x2, Citroen x1, Mazda x3, Nissan x1, Audi x3, Kia x1, Fiat x4, Subaru x3, Austin x2, Triumph x2, Jeep x2, Hyundai x2, Lexus x1, Mitsubishi x1, Saab x2... and some others I've forgotten!