Solved! Webasto FBH Diags

Keith · 24th November 2007, 14:39

Stop press!
Sending this from the garage

I have my laptop plugged into the the cars K bus via my Resler I bus interface and the Webasto diag software works a treat pictures to follow

Keith · 24th November 2007, 17:40

Here we are, note the temp info seems to be a bit odd with burner off you get water temp with burner on the range is up to 30,000 degrees which I think is a bit wrong!

Ths was with the interface connected to the entire K bus hence the ech errors from other devices

First picture, the unit is off

Firing up

Glow plug being powered down after firing up and flame is stabilised

Throtled back to half power once water is up to initial temp

Flat out from cold

Time line of outputs

Model info screen

ragitty · 24th November 2007, 19:04

Keith that means absolutely nothing to me, but I do know that the work you put into this forum is invaluable. on behalf of many forum users who like myself are mechanically un educated thank you.

Keith · 24th November 2007, 19:55

Thanks for that

What it means is anyone with a laptop or by humping their pc out to the car can buy (very cheap) or make (even cheaper) an I bus interface connect it to the K bus on the car or even directly to the FBH and probably find out what is wrong with it, do tests read fbh fault codes etc

Or even just play as I was doing today!

The Webasto software is a free download

simpsora · 24th November 2007, 20:06

Excellent work Keith. I am not as technically advanced as you , but am I right in thinking
that if one of the faulty PCB was put in the webasto (ie webasto coming on with K-bus activity), then the above diagnostics may give a further indicator as to what is going wrong on these boards? Thanks again for all your work and perseverence with this (and other problems)I am sure it is appreciated by all club members.

Robert.

Keith · 24th November 2007, 20:24

That is a good question

I have such a knackered PCB from the Tourer I just sold that had the start on Kbus fault, infact all it did was turn on the combustion fan
It would be nice to know if the board was electronically faulty or just doing daft things because the firmware was corrupted.

I am just not 100% sure I want to pull apart my ok FBH to test it

What I am going to do though as the diags can be used independant of the car is wait till one day a secondhand FBH and fuel pump comes my way from a write off and build a test rig using a suitable fuel tank and an old radiator in the garage

Then I might be able to offer to diagniose a few for members by swapping bits around to identify what is wrong as people can remove them from their cars temporaily and post them or bring them to me.

I am going to PM Andy in Wrexham he has a knackered unit which I would like to have a look at

In the meantime if anyone see a CDT in the breakers with or without FBH I could do with the two connectors plugs for the FBH these will be found on any CDT.

Then I can make up a FBH test lead and could even check them at meets etc

shakennstirred · 26th November 2007, 14:31

Quote:

Originally Posted by Keith

Thanks for that

What it means is anyone with a laptop or by humping their pc out to the car can buy (very cheap) or make (even cheaper) an I bus interface connect it to the K bus on the car or even directly to the FBH and probably find out what is wrong with it, do tests read fbh fault codes etc

Or even just play as I was doing today!

The Webasto software is a free download

hi there
can you get a lick up for the software please

Keith · 26th November 2007, 15:57

interface :-
http://www.reslers.de/
Webasto software and manuals
http://techwebasto.com/

Keith · 24th November 2007, 19:59

Quote:

Originally Posted by ragitty

on behalf of many forum users who like myself are mechanically un educated thank you.

Believe me I know nothing about anything untill I read up on the issue then go and have a tinker

For every success I post about there are a few well err less succefull things I don't mention like trying to unsolder the OBC display from an old cluster, made a complete pigs ear of that I did!

Keith · 31st December 2007, 12:08

A bit of info on the Freelander FBH I bought.

The firmware on the unit reports itself as 'Rover' not 'BMW' as is the norm which I found rather interesting as I had never come across one with Rover firmware till now.

The unit requires +12v on pin three to makes it work as a parking heater. The earlier 75 units also worked like this but later models switched to grounding pin 3, I would be interested to see what some of the last 75s produced require, perhaps it varies a lot more than originally thought!

The firmware on the unit properly triggers the relay for the cars heater blower fan only when it is up to temperature i.e pin 4 on the FBH goes to 12v only once the FBH has got up to about 30 degrees, the firmware in the standard Rover FBH (in my car at least) switches pin 4 on immediately which I always thought was probably not what was intended!

One advantage to that is faster engine warm up (FBH primary function) and less drain on the battery as the heater blower is only switched on when there is enough heat in the water to make it worthwhile

The Freelander FBH also operates in a summer cooling mode i.e grounding pin 5 stops the FBH firing but instead just operates the output on pin 4 to allow the car to be ventilated.
I have not checked to see if my own FBH in my car does this as well but as my Telestarts support this as an option I will have to look into it in the coming weeks

Also the diags properly show the correct water temp unlike the bonkers readings above from the 2001 model in my car

Why the above waffle?
Simple if you need a new PCB for your FBH the Freelander one looks like it is worth considering rather than one from a BMW unit

24th November 2007, 14:39	#1
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	Solved! Webasto FBH Diags Stop press! Sending this from the garage I have my laptop plugged into the the cars K bus via my Resler I bus interface and the Webasto diag software works a treat pictures to follow

24th November 2007, 19:04	#3
ragitty I really should get out more....... Jeep Cherokee Orvis Join Date: Oct 2007 Location: Leicester Posts: 2,666 Thanks: 0 Thanked 1 Time in 1 Post	Keith that means absolutely nothing to me, but I do know that the work you put into this forum is invaluable. on behalf of many forum users who like myself are mechanically un educated thank you. __________________ [SIGPIC][/SIGPIC]Dance like no-ones watching

31st December 2007, 12:08	#10
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	A bit of info on the Freelander FBH I bought. The firmware on the unit reports itself as 'Rover' not 'BMW' as is the norm which I found rather interesting as I had never come across one with Rover firmware till now. The unit requires +12v on pin three to makes it work as a parking heater. The earlier 75 units also worked like this but later models switched to grounding pin 3, I would be interested to see what some of the last 75s produced require, perhaps it varies a lot more than originally thought! The firmware on the unit properly triggers the relay for the cars heater blower fan only when it is up to temperature i.e pin 4 on the FBH goes to 12v only once the FBH has got up to about 30 degrees, the firmware in the standard Rover FBH (in my car at least) switches pin 4 on immediately which I always thought was probably not what was intended! One advantage to that is faster engine warm up (FBH primary function) and less drain on the battery as the heater blower is only switched on when there is enough heat in the water to make it worthwhile The Freelander FBH also operates in a summer cooling mode i.e grounding pin 5 stops the FBH firing but instead just operates the output on pin 4 to allow the car to be ventilated. I have not checked to see if my own FBH in my car does this as well but as my Telestarts support this as an option I will have to look into it in the coming weeks Also the diags properly show the correct water temp unlike the bonkers readings above from the 2001 model in my car Why the above waffle? Simple if you need a new PCB for your FBH the Freelander one looks like it is worth considering rather than one from a BMW unit Last edited by Keith; 31st December 2007 at 12:17..

24th November 2007, 17:40	#2
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	Here we are, note the temp info seems to be a bit odd with burner off you get water temp with burner on the range is up to 30,000 degrees which I think is a bit wrong! Ths was with the interface connected to the entire K bus hence the ech errors from other devices First picture, the unit is off Firing up Glow plug being powered down after firing up and flame is stabilised Throtled back to half power once water is up to initial temp Flat out from cold Time line of outputs Model info screen

24th November 2007, 19:55	#4
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	Thanks for that What it means is anyone with a laptop or by humping their pc out to the car can buy (very cheap) or make (even cheaper) an I bus interface connect it to the K bus on the car or even directly to the FBH and probably find out what is wrong with it, do tests read fbh fault codes etc Or even just play as I was doing today! The Webasto software is a free download

24th November 2007, 20:06	#5
simpsora Regular poster 2001 2.00 CDT 116 bhp Join Date: Nov 2006 Location: aberdeenshire Posts: 97 Thanks: 1 Thanked 1 Time in 1 Post	Excellent work Keith. I am not as technically advanced as you , but am I right in thinking that if one of the faulty PCB was put in the webasto (ie webasto coming on with K-bus activity), then the above diagnostics may give a further indicator as to what is going wrong on these boards? Thanks again for all your work and perseverence with this (and other problems)I am sure it is appreciated by all club members. Robert.

24th November 2007, 20:24	#6
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	That is a good question I have such a knackered PCB from the Tourer I just sold that had the start on Kbus fault, infact all it did was turn on the combustion fan It would be nice to know if the board was electronically faulty or just doing daft things because the firmware was corrupted. I am just not 100% sure I want to pull apart my ok FBH to test it What I am going to do though as the diags can be used independant of the car is wait till one day a secondhand FBH and fuel pump comes my way from a write off and build a test rig using a suitable fuel tank and an old radiator in the garage Then I might be able to offer to diagniose a few for members by swapping bits around to identify what is wrong as people can remove them from their cars temporaily and post them or bring them to me. I am going to PM Andy in Wrexham he has a knackered unit which I would like to have a look at In the meantime if anyone see a CDT in the breakers with or without FBH I could do with the two connectors plugs for the FBH these will be found on any CDT. Then I can make up a FBH test lead and could even check them at meets etc

26th November 2007, 15:57	#8
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	interface :- http://www.reslers.de/ Webasto software and manuals http://techwebasto.com/