Remote switch for early FBH

ShaunB · 24th October 2018, 20:07

Can anyone help me with wiring for early C type FBH ,I can start it by splicing into the wiring going to pin 1 but where does this wire come from if I disconnect this wire will the FBH lose its ability to fire automatically when cold enough or will splicing into run the risk of having 2 x 12V+ feeds into pin 1 .My plan is to have a text operated FBH but would also like it to still operate automatically ,any advice would be appreciated thanks

willster · 25th October 2018, 12:55

Don't activate it on pin 1. If the thermoswitch is closed for normal under 5 degree operation, you will send 12v back to the ecu, they don't like this, I found out the hard way. Think pin 4. But check with someone else first

ShaunB · 25th October 2018, 18:15

Thats what I was worried about,someone out there must have fitted a remote or manual switch to the early c type ,anyone out there ? Anyone ?

willster · 26th October 2018, 10:55

I will have a look under my bonnet if I get chance. I'm activating mine on pin but I took out the thermoswitch after my accident. I'm also activating the blowers via a relay which has its own pin. But can't remember which pin does which.

willster · 26th October 2018, 11:03

Pin 3 I believe is the one. Pin 4 is the output to blowers relay activation if required.

trebor · 26th October 2018, 17:24

Are you sure you have the early type as that will fire up as a supplementary heater via the sensor and alternator feed from pin 3 , leaving pin 1 as the pin to wire your remote to, so the exact opposite to the later B model.

If you do have the early type and pin 1 is already populated has someone before you wired up a remote for it ?

dinky d · 26th October 2018, 17:28

Quote:

Originally Posted by willster

Pin 3 I believe is the one. Pin 4 is the output to blowers relay activation if required.

Pin 4 gives out 12vwhen the pcb is running,pin 2 is for diagnostics info,pin 6 is fuel pump,pin 5 not used pin 1 or 3 to trigger heater,hope this helps.TOM.

24th October 2018, 20:07	#1
ShaunB Regular poster MG ZT-T Join Date: Nov 2016 Location: Wolverton Posts: 90 Thanks: 14 Thanked 16 Times in 12 Posts	Remote switch for early FBH Can anyone help me with wiring for early C type FBH ,I can start it by splicing into the wiring going to pin 1 but where does this wire come from if I disconnect this wire will the FBH lose its ability to fire automatically when cold enough or will splicing into run the risk of having 2 x 12V+ feeds into pin 1 .My plan is to have a text operated FBH but would also like it to still operate automatically ,any advice would be appreciated thanks

25th October 2018, 12:55	#2
willster Loves to post Rover 75 Tourer Auto CDT Join Date: May 2009 Location: Rochdale Posts: 319 Thanks: 8 Thanked 20 Times in 18 Posts	Don't activate it on pin 1. If the thermoswitch is closed for normal under 5 degree operation, you will send 12v back to the ecu, they don't like this, I found out the hard way. Think pin 4. But check with someone else first __________________ Our greatest hopes and our worst fears are seldom recognized

26th October 2018, 10:55	#4
willster Loves to post Rover 75 Tourer Auto CDT Join Date: May 2009 Location: Rochdale Posts: 319 Thanks: 8 Thanked 20 Times in 18 Posts	I will have a look under my bonnet if I get chance. I'm activating mine on pin but I took out the thermoswitch after my accident. I'm also activating the blowers via a relay which has its own pin. But can't remember which pin does which. __________________ Our greatest hopes and our worst fears are seldom recognized

26th October 2018, 11:03	#5
willster Loves to post Rover 75 Tourer Auto CDT Join Date: May 2009 Location: Rochdale Posts: 319 Thanks: 8 Thanked 20 Times in 18 Posts	Pin 3 I believe is the one. Pin 4 is the output to blowers relay activation if required. __________________ Our greatest hopes and our worst fears are seldom recognized

26th October 2018, 17:24	#6
trebor This is my second home Rover 75 CDTi Connoisseur SE & MG ZT Saloon 190 Join Date: Jun 2007 Location: Coven Posts: 12,523 Thanks: 526 Thanked 1,877 Times in 885 Posts	Are you sure you have the early type as that will fire up as a supplementary heater via the sensor and alternator feed from pin 3 , leaving pin 1 as the pin to wire your remote to, so the exact opposite to the later B model. If you do have the early type and pin 1 is already populated has someone before you wired up a remote for it ? __________________ www.midlandsnanomeets.co.uk Robs Car Gallery Coven near Wolverhampton WV9 2000 Cowley Built Rover 75 2.0 V6 Club SE/ Atlantic Blue/ Sandstone/Walnut (daily driver) 2003 Land Rover Freelander 1 TD4 HSE Helsinki Blue/Black Leather (swmbo daily driver)

25th October 2018, 18:15	#3
ShaunB Regular poster MG ZT-T Join Date: Nov 2016 Location: Wolverton Posts: 90 Thanks: 14 Thanked 16 Times in 12 Posts	Thats what I was worried about,someone out there must have fitted a remote or manual switch to the early c type ,anyone out there ? Anyone ?