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thehelper



Member Since: 29 Jul 2018
Location: Cambridgeshire
Posts: 149

United Kingdom 2008 Freelander 2 TD4 HSE Auto Baltic Blue
Front Parking Sensors Beep above idle

Starting a new thread on this because original post was misleading.
During the recent icy weather my front parking sensors started beeping almost continuously when reverse selected.
Diagnostics showed one sensor was dead. I have now changed it for a new one. But the fault persists. Watching the distance readings from the front sensors, they all read ok at about 1.6m until I increase the revs just above idle, then one of the sensors shows a shorter distance ( about 0.Cool and triggers the constant beep, if the new sensor is fitted, it is this one that triggers, if i swap its position the fault moves with it. However, if I remove the new sensor and fit the old dead one, one of the other 3 sensors reacts to the increased revs and triggers the beep.
I have double checked the wiring loom continuity, and tried a battery disconnect to reset the system.
Voltage at idle is 14.2 and increased revs raises it to 14.3v which triggers the beep.
Not sure of a way forward now. Anyone got any ideas.

Post #428342 31st Dec 2022 4:48 pm
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MotionInc



Member Since: 17 Jun 2019
Location: North America
Posts: 1278

Canada 2008 LR2 i6 SE Auto Tambora Flame

Have you removed the airbox and closely inspected the loom that sits right below it?

Post #428343 31st Dec 2022 5:01 pm
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thehelper



Member Since: 29 Jul 2018
Location: Cambridgeshire
Posts: 149

United Kingdom 2008 Freelander 2 TD4 HSE Auto Baltic Blue

No I have not. Is this a common problem.?

Post #428346 31st Dec 2022 5:40 pm
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thebigyin79



Member Since: 27 Oct 2020
Location: Scotland
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United Kingdom 2007 Freelander 2 TD4 HSE Manual Tangiers Orange

MotionInc wrote:
Have you removed the airbox and closely inspected the loom that sits right below it?

Any more info on this?

Post #430765 10th Mar 2023 2:26 pm
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thehelper



Member Since: 29 Jul 2018
Location: Cambridgeshire
Posts: 149

United Kingdom 2008 Freelander 2 TD4 HSE Auto Baltic Blue

Hi, yes sorry, I posted the solution on a different thread. In the beginning, one sensor was reading as faulty using the fault reader, so I changed it but did not cure the problem. It turns out that one of the other sensors was breaking down under increased voltage. Stupidly I discounted this possibility because the first sensor read faulty but all the others seemed normal. I only found it because I had tried everything else. So changed the 3 remaining sensors one at a time.
.

Post #430766 10th Mar 2023 2:48 pm
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thebigyin79



Member Since: 27 Oct 2020
Location: Scotland
Posts: 20

United Kingdom 2007 Freelander 2 TD4 HSE Manual Tangiers Orange

Thanks for the reply, my sensors stopped beeping/working with just the flashing light on the button above the radio, I put a reader on and it showed front right inner sensor not working, I replaced that sensor and now when I select reverse it's just a constant beep, I plugged the reader in again and deleted the old code, read it again and there's no fault codes showing, I'm in the middle of doing a hard reset now to see if that might help, really no clue what to do next if the reset doesn't work.

Post #430769 10th Mar 2023 2:58 pm
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thebigyin79



Member Since: 27 Oct 2020
Location: Scotland
Posts: 20

United Kingdom 2007 Freelander 2 TD4 HSE Manual Tangiers Orange

thebigyin79 wrote:
MotionInc wrote:
Have you removed the airbox and closely inspected the loom that sits right below it?

Any more info on this?
forgot to quote you in my last reply, sorry 👍

Post #430770 10th Mar 2023 3:01 pm
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thebigyin79



Member Since: 27 Oct 2020
Location: Scotland
Posts: 20

United Kingdom 2007 Freelander 2 TD4 HSE Manual Tangiers Orange

thehelper wrote:
Hi, yes sorry, I posted the solution on a different thread. In the beginning, one sensor was reading as faulty using the fault reader, so I changed it but did not cure the problem. It turns out that one of the other sensors was breaking down under increased voltage. Stupidly I discounted this possibility because the first sensor read faulty but all the others seemed normal. I only found it because I had tried everything else. So changed the 3 remaining sensors one at a time.
.
👍

Post #430771 10th Mar 2023 3:02 pm
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thehelper



Member Since: 29 Jul 2018
Location: Cambridgeshire
Posts: 149

United Kingdom 2008 Freelander 2 TD4 HSE Auto Baltic Blue

thebigyin79 wrote:
Thanks for the reply, my sensors stopped beeping/working with just the flashing light on the button above the radio, I put a reader on and it showed front right inner sensor not working, I replaced that sensor and now when I select reverse it's just a constant beep, I plugged the reader in again and deleted the old code, read it again and there's no fault codes showing, I'm in the middle of doing a hard reset now to see if that might help, really no clue what to do next if the reset doesn't work.

The original symptom you had points to the very common front sensor cable loom chaffing and water ingress. It could well be that when you changed the faulty sensor, your flexed the faulty cable causing the indication to change. I would remove the bumper and check the cable for signs of damage.

Post #430772 10th Mar 2023 3:17 pm
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thebigyin79



Member Since: 27 Oct 2020
Location: Scotland
Posts: 20

United Kingdom 2007 Freelander 2 TD4 HSE Manual Tangiers Orange

I'll do what you've said and inspect the full loom thats there in the front bumper, appreciate the input thanks again. 👍

Post #430773 10th Mar 2023 3:21 pm
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thehelper



Member Since: 29 Jul 2018
Location: Cambridgeshire
Posts: 149

United Kingdom 2008 Freelander 2 TD4 HSE Auto Baltic Blue

If you find any signs of damage. The water gets inside the insulation and corrodes the wire, making it very difficult to repair. Also difficult to trace all the breaks caused. I would advise buying a used loom off eBay. They usually come with a set of sensors fitted. Which is handy as they fit the rear as well. Let me know how you get on.

Post #430774 10th Mar 2023 3:47 pm
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thebigyin79



Member Since: 27 Oct 2020
Location: Scotland
Posts: 20

United Kingdom 2007 Freelander 2 TD4 HSE Manual Tangiers Orange

Thats a good idea about the new loom, I'll see if I can find one.

Post #430775 10th Mar 2023 3:51 pm
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MotionInc



Member Since: 17 Jun 2019
Location: North America
Posts: 1278

Canada 2008 LR2 i6 SE Auto Tambora Flame

thebigyin79 wrote:
Thanks for the reply, my sensors stopped beeping/working with just the flashing light on the button above the radio, I put a reader on and it showed front right inner sensor not working, I replaced that sensor and now when I select reverse it's just a constant beep, I plugged the reader in again and deleted the old code, read it again and there's no fault codes showing, I'm in the middle of doing a hard reset now to see if that might help, really no clue what to do next if the reset doesn't work.

This was not an easy find but here you go, video in first post:
https://www.freel2.com/forum/topic36251.ht...oom+damage

Post #430777 10th Mar 2023 4:46 pm
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thebigyin79



Member Since: 27 Oct 2020
Location: Scotland
Posts: 20

United Kingdom 2007 Freelander 2 TD4 HSE Manual Tangiers Orange

Thank you for the video, I'll check that out aswell 👍

Post #430778 10th Mar 2023 5:17 pm
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