Over these past few days I noticed when moving the gear lever from P to D when first moving off after starting up, as it gets to R there was an alert sound which stopped when it went on to N. Now when reversing there is no distance warning alert when nearing objects. There's no error message coming up on the dash.

Is it just a case of checking the fuses or is there something more sinister (& expensive!) I need to sort?

Any words of wisdom on this greatly appreciated.

 

I had the same problem. Put the car in reverse with the ignition on, but don't fire the engine. Then go round the back of the car and put your ear next to each of the four sensors along the bumper. You should hear a faint rapid clicking sound from each one. If only one sensor is down, the entire system fails.

I replaced the one defective sensor I had and it all works beautifully again.

 

Just checked, and getting the rapid clicking noise from each of the four sensors.

 

Checked the module in the boot and all looks good - no signs of corrosion or faulty connections. Have cleaned meticulously the sensors again and retested for the rapid clicking, and each one emits the noise quite clearly. Am still getting the continuous bleep when first selecting reverse.

Section 4-42 of the drivers handbook states the 'system has a fault' when this happens, which is genius!, but could it be an issue with the reverse speaker ie wiring? If this is worth checking, any advice how to do some testing on it?

I'm loathed to take it to a garage at this early stage.

Cheers in advance...

 

It could be the Speaker which is in the rear of the Centre Console. It could also be the Sensor harness connections behind the Rear Bumper which can get covered in road dirt etc.

This is the link to the Reverse Parking Aid installation instructions on my MediaFire account (the file is too big to add here as an attachment):

http://www.mediafire.com/view/?9acnkz6205x1ndd

Ignoring the bumper drilling instructions etc for the sensors, it's a good guide to the circuit and layout.

Graham

 

Thanks Graham. Checked speaker connection and all looks good. Checked module wiring and again all looks ok. Haven't as yet checked the sensor wiring from the module, and assume that means a bumper off job?

Worth mentioning, all sensors are emitting the clicking but one (perhaps) is very slightly less loud than the other 3. I could be just imagining it, but if so, does this mean its faulty?

Thanks again.
Jules

 

Jules,

Unfortunately it is a bumper off to get to the back of the sensors and the harness from them to the module. The bolts can be a real joy if the bumper hasn't been off in a while. The lowest cost item on the whole assembly is the brackets (on the UK non energy absorbing type), so always go for these if something has to be broken to remove the bumper.

Other than physical damage, usually it's water or dirt trapped between the sensor and the sensor sleeve which sets off a continuous alert on moving the selector from P through R.

Graham

 

Jules
I put money on it being a sensor,I had exactly the same thing.

 

I didn't have to remove the bumper. The technique involved in removing each sensor is actually quite simple, yet hard to put into words. You push it out from the inside, twist and it breaks into two pieces, allowing you to remove it from the bumper. There may be a video on Youtube.

 

Thanks Frog. I'll do a search on Youtube as this could save me lots of time. If I find it I'll post it back on here for others to refer to.

Cheers
Jules

 

Had the diagnostic done this morning and have had it confirmed the rear right sensor is not functioning as it should. The quote I've been given for a replacement sensor (1 x unpainted) is £60 (c.$90) which seems steep, or is it?

I've seen a set of 4 on e-bay for £40 but not sure if these are OEM parts... Any advice on where I could order genuine sensors at a reasonable price?

Thanks
Jules

 

Jules,

One of the specialist UK Jaguar breakers is your best bet.

I wouldn't worry too much about the colour as you'll be very unlucky if the original cover can't be reused. Even if it can't, HDpartsman00XKR has recently posted a superb guide to refinishing door mirrors ( https://www.jaguarforums.com/forum/x...n-101-a-94650/ ) and the same technique could be used for the sensor cover.

Graham

 

Does the parking assist work automatically or do I have to hit it when I want to use it? I'm so glad this forum exists

 

Automatically.

 

In post #9 below, Frog mentions a procedure to remove sensors without dropping the rear bumper. Does anyone have any further info on this? I can't seem to get it.

Here's my symptom BTW: constant tone from parking assist when selecting reverse ... but not all the time! Seems most likely to happen after the car has been driven for a while. At times, the system works normally.

I was able to borrow a parking assist module from another car to see if that changed anything. Nope. So it looks like I'm dealing with a problem in sensor(s) or harness.

 

Are the sensors clicking when reverse gear is selected? Go out and have a listen. Most likely a sensor has a shorted/broken connection, or you simply need a new sensor. The click-check should tell you which sensor is causing the problems.

 

Thanks. All clicking away happily at the moment, but then I don't have the symptom right now either. I'll need to have it fail in a quiet environment where I can re-check this.

I did figure out how to get a corner sensor out, so I'll clean and refit those two and see what happens. I don't think it's going to be possible to get the two inner sensors out of a USA-spec bumper while it's in place, but hope somebody will tell me I'm wrong.

 

I had a similar problem a couple of years ago. The Main Dealer said it was the Module, which they replaced. Still not solved. They then said it was a sensor, which they replaced & that seemed to solve the problem - temporarily! However, the problem surfaces still, from time to time & I suspect the real culprit could be a low battery, as I don't use the car a lot & it always occurs after a period of not using the car. When the battery is charged up, it seems to work OK. Just a suggestion that costs nothing to check out.

 

Thanks. Battery is almost new and reads good.

Does anyone know if there is an electrical test of some sort that can be done on a sensor when it's out of the car? Could a dealer test it?

 

Just wanted to report outcome. The problem was a dirty right-corner sensor. Cleaning around it did not help; had to remove it and clean inside the sensor assembly. I would never have guessed this would do it, but there it is. (Result can't be attributed to cleaning the electrical connection since I tried that before moving on to removing the sensor from the bumper.)

All better now.

A few things learned that hopefully will be of value to someone:

- The sensors are held in place in a way much like that commonly used to secure automotive light bulbs ... push against a spring, twist a little CCW (that's ACW if you're British) to remove, push and twist a little CW to install.

- The corner sensors are pretty easy to remove but the center ones ... on a USA-spec bumper it looked to me like the bumper would have to come off to do it.

- The electrical connectors are secured by a little clip which must be opened first to allow opening the connector (and closed last when re-connecting things). The connectors, on my car anyway, were a royal PITA to close. You have to push pretty hard and there's just no room for your hands under there.

FWIW ...