Idiots guide to fitting Webasto 1533 timer

EXMSRalph · 29th October 2009, 10:04

Can someone provide a step-by-step idiots guide to fitting a Webasto 1533 timer to face lift car that has the FBH already fitted?

We have the system basically working, but can't get it to fire up the air con fan.

Keith · 29th October 2009, 18:45

I was down in Sittingbourne till yesterday meant to pop in and say hello but hospital visits prevented it.

Timer pokes out 12v
so you use that to operate a relay to stick gnd on pin 3 of the FBH or bypass the need for a relay by conecting timer to pin 1
I prefer to leave that wired up the the ambient temp sensor though hence using pin 3.

You can then also operate another relay direct from the timer or use Pin 4 of the fbh.

Pin 4 goes to 12v depending on FBH firmware either after FBH is up to about 30 degrees or immeadiately that can be used for the relay to operate the ATC that way ATC does not come on if FBH goes into lock out even if timer is still trying to operate the FBH.

So use the timer or pin 4 to operate a DPDT relay for the ATC
Common contacts go to the two power feeds to the ATC panel, ATC side
N/C contacts to the two power feeds to the ATC panel loom side i.e when off wiring is as normal
N/O contact to a fused 12v supply so when FBH is on AC panel is on

easy

billnick · 3rd November 2009, 19:58

Keith after owning my cdt for three years i have just noticed that the FBH Ambient temp sensor is missing but every thing workes ok, my fbh is activated via telestart so do you think the sensor was removed on purpose or has it just fell off.

Regards bill.

29th October 2009, 10:04	#1
EXMSRalph Gets stuck in ZS180, MGF, Rover 400, MG Montego Join Date: Sep 2007 Location: Sittingbourne Posts: 534 Thanks: 0 Thanked 0 Times in 0 Posts	Idiots guide to fitting Webasto 1533 timer Can someone provide a step-by-step idiots guide to fitting a Webasto 1533 timer to face lift car that has the FBH already fitted? We have the system basically working, but can't get it to fire up the air con fan.

3rd November 2009, 19:58	#3
billnick Loves to post ex 75 Join Date: Jan 2007 Location: Abergele Posts: 445 Thanks: 0 Thanked 0 Times in 0 Posts	question for keith Keith after owning my cdt for three years i have just noticed that the FBH Ambient temp sensor is missing but every thing workes ok, my fbh is activated via telestart so do you think the sensor was removed on purpose or has it just fell off. Regards bill.

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29th October 2009, 18:45	#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	I was down in Sittingbourne till yesterday meant to pop in and say hello but hospital visits prevented it. Timer pokes out 12v so you use that to operate a relay to stick gnd on pin 3 of the FBH or bypass the need for a relay by conecting timer to pin 1 I prefer to leave that wired up the the ambient temp sensor though hence using pin 3. You can then also operate another relay direct from the timer or use Pin 4 of the fbh. Pin 4 goes to 12v depending on FBH firmware either after FBH is up to about 30 degrees or immeadiately that can be used for the relay to operate the ATC that way ATC does not come on if FBH goes into lock out even if timer is still trying to operate the FBH. So use the timer or pin 4 to operate a DPDT relay for the ATC Common contacts go to the two power feeds to the ATC panel, ATC side N/C contacts to the two power feeds to the ATC panel loom side i.e when off wiring is as normal N/O contact to a fused 12v supply so when FBH is on AC panel is on easy