Vehicle & Technical > Discovery
Webasto Pre Heater & Alarm sensors.
Andy.:
Hi Gary.
My anti theft alarm system is factory fit by LR. It basically has two setting.
Perimetric protection using the key will arm all doors, tailgate, and bonnet and cranking is also disabled. This method disables the ultrasonic sensors when the vehicle is locked.
Volumetric protection using the handset remote (key fob) protects the interior using the ultrasonic sensors and also arms and disarms the vehicle perimetrically and cranking again is disabled.
Now because the blower is setting off the sensors they need to be turned off.
I could like I've said on a night use the key and disable the sensors and pre set the heater for the morning. This however would leave the interior vunerable over night until I return to the vehicle. If someone smashed a window the sensors would not be armed to detect this.
Or as Webasto have said fit a relay into the sensor circuit connected to the pre heater fan relay. This way the sensors would only be disabled for 30 minutes while the heater is in operation, throughtout the night they would be armed as normal.
The reason for the key method is so you can lock the vehicle whilst passengers like the kids or pets are inside and they will not set off the alarm.
The pdf wiring diagram I sent you seems straight forward enough to follow and I have ordered a suitable relay. I will this wekend have a closer look at the set up and examine the wiring in view to installing a relay.
To answer one of your questions, yes the motor will be less protected using the key method as opposed to the key fob.
Hope that clears a few things up, good fun this LR ownership :lol:
Gary:
Hi Andy
Your right, it is good fun this Land Rover ownership, there's never a dull moment ! :)
How have you got on with fitting that relay mate.
I'm curious Andy, how many wires are there in the cable going to your ultra sonics? :roll:
Regards, Gary
Andy.:
Sorry Gary not had chance today been fitting a reversing aid instead.
I've just ordered some stuff from VWP for my split charge set up so I thought while I was doing that order a relay for the alarm. Should be here early next week.
Will keep you posted :wink:
Andy.:
Right been changing some interior bukbs this morning, however when placing back the digi timer for the pre heater I accidently pressed the instant heat button.
Now before I had to have the blower set, this time the blower was off on the panel. But because of the way it is wired the pre heater relay auto activates the blower on start up.
The last pre heater I had it was wired to number 2 setting on the blower and I had no alarm issues, this time it auto comes on at blower speed 3 which I guess is why the sensors are going off.
So I could revert back to the number 2 blower setting, but I do like it as it is now, as it's lovely and warm inside and it is using the maximum blower speed to warm the cab up.
So now I've found the problem, it's on to solving it.
I have taken the sensor panel off the head trim today and there are 3 wires for the sensors. Earth, White/Black wire and a Brown/Black wire. the second two both go to the alarm ECU.
Now according to the Webasto pdf file I got it's says the relay should be connected to the White/Black wire for the sensors. Still intrigued though as to this fuel burning heater unit connection on the main alarm ECU.
And just out of interest could someone else confirm where the alarm ECU is located on a 200 series Discovery :?:
Andy.:
Right well the relay is in. Fitted it this afternoon, bit tricky wiring up the sensor wire due to there location but apart from this very straight forward if you follow the Webasto pdf wiring diagram.
Once installed I tested the relay. Set the pre heater going and it ran it's full cycle without the alarm going off.
Tested the sensors after whilst sitting in the motor and they worked fine.
Cheers for the advice given and if anyone wants the pdf file send me a PM and I'll send it over :wink:
Change over relay.
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