fixed alarm fault

Hi All, after asking so many q's and getting so much useful info from you all I'm pleased to offer some help of my own..

having had an annoying ' Alarm fault' since i got the car.. i eventually got around to looking at it this weekend...
the alarm seamed to function ok.. but had the annoying bleep when i put the key in, and the error message.. having no fault reader.. i've checked the obvious for faults..

anyhow.. decided it 'might' be the ultrasonics.. so rather than looking for anything 2nd hand.. i took the plunge, spent £5 on ebay on a pair of new sensors.. 1 min with a soldering iron.. and hey presto..
fault cleared.. !!!

hope this maybe helps someone else...

what about the sensor in the dashboard?? thanks for your help!

There is no alarm sensor in the dashboard, if you're on about the thing next to the flashing red light that's a sensor to detect the level of the sun to adjust the fan speed for the air conditioning.

Hi
I have the same fault with mine, would you help me locate them on e-bay and where they are fitted in the vechicle

Brian

It's located on the roof on the passenger side, roughly where the b pillar is.

Search on ebay for range rover p38 ultrasonic and you'll find it.

Hello
Thanks for your reply, I did change the whole unit ,albeit for a S/H from e-bay., Ah i correct to think that your original post suggests that you changed just some components

Brian

hi Brian, yep i just changed the sender and receiver components
40KHZ ULTRASONIC TRANSDUCERS, ALARMS / ROBOTICS fba12a | eBay

hi chopper
Thank you for your reply, i am no expert so i need to ask are these components all fitted in the alarm sensor lh side above the door pillar

Regards Brian

Hi Brian, yeah.. the sensor just unclips from the roof... then inside the back of the unit unclips to reveal the circuit board.
you need to remove the whole thing from the casing...(gently tease the ultrasonic modules from their holes.. they are housed in a rubber grommet)..
when you get the replacements they are labeled.. obviously one is send and the other receive..
so make sure you replace the correct one with the correct replacement, and of course the pins to the correct wires....
it was pretty simple to work out when you looked at the back of the old ones and the new ones....

any more questions feel free to ask... sorry i didnt take any pics.. but it is very straight fwd

Hi Everybody
Just a follow up, I have ordered the components as suggested in the previous posts, But i have just been working on the vehicle re the flat battery, becm not syncing with the ecu, re-fitted a fully charged battery, used my new syncmate pleased to say the vehicle started first time with no alarm fault warning showing

Brian

muddylane said:

Hi Everybody
Just a follow up, I have ordered the components as suggested in the previous posts, But i have just been working on the vehicle re the flat battery, becm not syncing with the ecu, re-fitted a fully charged battery, used my new syncmate pleased

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Does that mean a re-sync fixed it?

Hi
Yes it would appear so, i did no more than fit a fully charged battery,and re-syc using a new syncmate
Brian

muddylane said:

Hi
Yes it would appear so, i did no more than fit a fully charged battery,and re-syc using a new syncmate
Brian

Click to expand...

Hate to say I told you so