hi All, my front sensors have suddenly stopped working. the rears are fine and all was well with the front ones, then just got in the car and they were no longer working. any ideas as to what i could check and what is the easiest way of getting at them? do i actually need to remove the bumper

bob

Is it icy there? I have seen mine stop working in heavy frost or ice. Previously..
Vogue SE TD6
Defender 90 2.4
Defender 110 TD5
Vogue 3.5 EFI

Have a look here -

It's easy to diagnose:

1. Once you have activated the front PDC - put your ear up to each sensor and listen for a clicking sound.
2. If none of them are clicking then it is likely to be a break in the wiring loom
3. If some are clicking then the chances are it is a single sensor failure

I replaced one a couple of weeks ago and couldn't find anything useful on YouTube to explain how to remove the front bumper so I used the workshop manual (which isn't brilliant but you can work it out). It can be done in 10 minutes once you know how - remove grille, remove about a dozen screws and don't forget the 2 hidden ones behind the plastic caps, remove the screw in each wheel well of off she pops. Be careful the wiring isn't very long so you'll need something to rest the bumper on

A dealer is currently replacing one of mine and said that the replacement will need spraying up in body colour. Is that correct, do replacement sensors need spraying?

If you want them to match. Don't think you can get replacement sensors in "all" colours. If you need to know for sure check with Duckworths Dan. .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

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Thanks Joe. Just being overly suspicious.

hi archie, no it is not really icy. infact very mild at around 16 degrees at the mo. i will listen at the front and see if i can hear anything clicking? with regard to switching them on, i assume i just turn on the ignition and put it in drive to test them would that work

bob

Leave it in park. There is a button, bottom left, to switch on the park sensors.  Previously..
Vogue SE TD6
Defender 90 2.4
Defender 110 TD5
Vogue 3.5 EFI

When I lost the front sensors, it was the PDC ECU in the boot that needed to be replaced.

ok mate, i did know about the button but just thought that used if you wanted to keep them on whilst driving . the rears are working no problem; so dont know if that rules out the ecu in the boot unless there are seperate ones for front and rear

bob

BOBCUSSEN wrote:

hi archie, no it is not really icy. infact very mild at around 16 degrees at the mo. i will listen at the front and see if i can hear anything clicking? with regard to switching them on, i assume i just turn on the ignition and put it in drive to test them would that work
bob

well when i get in mine, i normally just start it, and if i put it in reverse, it works straight away, and if i pull forward it also works straight away . i dont have to switch anything on for it to do this ; the light comes on on the switch without me having to press anything. i thought if you wanted to have them on whilst driving, you just needed to press the switch, and this would alert you when approching someone or something, and vice versa.?

however i am a newbie to this wonderfull motorcars, so hell, what do i know.

so please correct me if again i have it completly wrong

bob

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To get to drive you transition through (assuming you leave in park) reverse, think this is what triggers the system.

My routine is start engine, select reverse and back out - during this time both front and rear are active - drive off and exceed the trigger speed and the system is deactivated. when coming home I have to manually turn the system on or select reverse (if system has been turned off manually reverse will not activate system until a power cycle)

yes, when i start, i jus put in reverse and on comes the light and the rears are working, when i pull forward, up until they stopped, the fronts came on without having to do anything else. when i start driving, after a short while the light goes off. i guess i will just do the checks as i expect it is either the sensors themselves or the rear ecu