webasto how many amps to pin 3

macafee2 · 11th December 2013, 20:40

a few questions about supplying power to the webasto heater:

1. Should pin be supplied with positive or negative?
2. How much current will pin 3 draw?
3. what does pin 3 control? glow plug? circulation pump?
4. there are some electrical plugs that fit into the top of the heater.
could you guide me as to what each plug and each pin for the electrical plugs actually do?

trying to work put which wires I need and which ones I don't as I'm not using the outside air temperature gauge

Thank you

macafee2

Snagger · 11th December 2013, 21:53

This is a good source of info on the FBH

http://www.the75andztclub.co.uk/foru...768#post877768

Have a good read

Snagger.

Jules · 12th December 2013, 00:05

Only Milliamps to pin 3 !!

alan richard · 12th December 2013, 09:19

pin 3 (of the 6 pin plug) is just a -ve control signal. As the man said; Only milliamps.

It controls the whole lot - operation of the unit fan/pump/pump/glowplug.
From startup sequence to shutdown sequence.

The only significant current draw is on the 2-pin power plug

You need not mess with the other plugs on the FBH - they are internal from the units fan/pump/pump/glowplug to its own circuit board.

"I'm not using the outside air temperature gauge"

-You could instead use pin.1 and put +12v to it, instead of the car putting +12v to it when it's cold.
However (IMO) you'd be as well to leave that as is, you then have auxilliary heating on startup.

The k-bus on pin.2 does nothing useful on the Rover
(on some beemers the webasto talks via the k-bus to the heater controls for parking heating)
It does leave the Webasto vunerable to k-bus voltages zapping the pcb in some conditions. Feel free to snip away or re-use the pin to put into slot 3.

Note: All above refers to the Model 98570B (later) FBH

-a

Jules · 12th December 2013, 12:44

Quote:

Originally Posted by alan richard

pin 3 (of the 6 pin plug) is just a -ve

The k-bus on pin.2 does nothing useful on the Rover
(on some beemers the webasto talks via the k-bus to the heater controls for parking heating)
It does leave the Webasto vunerable to k-bus voltages zapping the pcb in some conditions. Feel free to snip away or re-use the pin to put into slot 3.

Note: All above refers to the Model 98570B (later) FBH

-a

Unless it's causing K-bus problems, leave pin 2 connected as some OBD diagnostics can talk to the 75 Webasto.
My Launch does but my T4 doesn't because MGR didn't pay for the extra software.

With the forced output facility I can:

Power up the Glow plug
Run the combustion fan
Measure the glow plug resistance
Run the water pump
Run the dosing pump

All independently of each other.............and all via Bluetooth

macafee2 · 12th December 2013, 18:35

thank you for the info. I am now the owner of a 98570B heater. It's not a heavy as expected. The dosing pump bracket is quite useable but I'm going to take the pump off to clean and paint the bracket. With help of another thread I think I've found the fuel pipe in the engine bay.
I have a lot of threads bookmarked and so I'm hoping that I'll be able to fit this without any problems.

The weekend is only a day away

macafee2

11th December 2013, 20:40	#1
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,929 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	webasto how many amps to pin 3 a few questions about supplying power to the webasto heater: 1. Should pin be supplied with positive or negative? 2. How much current will pin 3 draw? 3. what does pin 3 control? glow plug? circulation pump? 4. there are some electrical plugs that fit into the top of the heater. could you guide me as to what each plug and each pin for the electrical plugs actually do? trying to work put which wires I need and which ones I don't as I'm not using the outside air temperature gauge Thank you macafee2

11th December 2013, 21:53	#2
Snagger Gets stuck in ROVER 75 CDT CLUB SE 02 Join Date: Aug 2009 Location: Kent Posts: 658 Thanks: 30 Thanked 141 Times in 87 Posts	This is a good source of info on the FBH http://www.the75andztclub.co.uk/foru...768#post877768 Have a good read Snagger. __________________ How to remove CDT alternator from top & side :- http://www.the75andztclub.co.uk/foru...d.php?t=199608 Battery charge light problems on a diesel ? http://www.the75andztclub.co.uk/foru...3&postcount=64 Diesel charging FBH voltage supply diagram http://www.the75andztclub.co.uk/foru...ght=cdt+charge How to identify voltage regulator type diesel http://www.the75andztclub.co.uk/foru...56&postcount=3

12th December 2013, 00:05	#3
Jules This is my second home ZT 260 SE Twilight and 10 other 75 ZT's :O Join Date: Jan 2007 Location: Conwy NORTH WALES Posts: 11,094 Thanks: 512 Thanked 1,116 Times in 763 Posts	Only Milliamps to pin 3 !! __________________ [SIGPIC][/SIGPIC] Newbies do now!! 1. Plenum drains..all 3 or 4 year dependent 2. Cooling fan..All speeds functioning 3. Bonnet cable divider block

12th December 2013, 09:19	#4
alan richard Avid contributor 75 Tourer cdti Join Date: Jul 2012 Location: Melton Mowbray Posts: 244 Thanks: 62 Thanked 23 Times in 22 Posts	pin 3 (of the 6 pin plug) is just a -ve control signal. As the man said; Only milliamps. It controls the whole lot - operation of the unit fan/pump/pump/glowplug. From startup sequence to shutdown sequence. The only significant current draw is on the 2-pin power plug You need not mess with the other plugs on the FBH - they are internal from the units fan/pump/pump/glowplug to its own circuit board. "I'm not using the outside air temperature gauge" -You could instead use pin.1 and put +12v to it, instead of the car putting +12v to it when it's cold. However (IMO) you'd be as well to leave that as is, you then have auxilliary heating on startup. The k-bus on pin.2 does nothing useful on the Rover (on some beemers the webasto talks via the k-bus to the heater controls for parking heating) It does leave the Webasto vunerable to k-bus voltages zapping the pcb in some conditions. Feel free to snip away or re-use the pin to put into slot 3. Note: All above refers to the Model 98570B (later) FBH -a Last edited by alan richard; 12th December 2013 at 09:29.. Reason: 2-pin plug mentioned

12th December 2013, 18:35	#6
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,929 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	thank you for the info. I am now the owner of a 98570B heater. It's not a heavy as expected. The dosing pump bracket is quite useable but I'm going to take the pump off to clean and paint the bracket. With help of another thread I think I've found the fuel pipe in the engine bay. I have a lot of threads bookmarked and so I'm hoping that I'll be able to fit this without any problems. The weekend is only a day away macafee2