I know I have seen posts on this subject before, sadly the search engine on this does not seem to find them unless I use Google and scroll through pages and pages. Maybe someone has a link they can post.

Mine do not seem to work, front or back. On a 2006 XJ6 2.7TDVI (I suspect mine is a 2005MY with a 56plate)

When I start the car I get a loud beep (I'm deaf in one ear so cant tell where it is coming from), but when I drive or reverse up to anything there is nothing.

Where do I start to diagnose the problem?

 

Maybe THIS will help. Most likely you have a bad sensor and it's in error mode.

 

Not sure how long you've owned the car, but make sure the overhead "P" switch is off. Or on I can't remember, it disables the parking beeps when they go mad. I can't remember if it resets after an ignition cycle, but there's a red light next to it.

 

Hi Chris,
The parking sensor alarm cancel does reset after an ignition cycle.
A long beep when turning the ignition on or engaging reverse indicates a fault.

Parking sensor fault indication
There is more information on page 118 of the owner's manual.

Pete M

 

Dear Pete M,
if you keep giving sensible answers then I might need to visit you.
(I was in "nearby" Queenstown last month but with a hire car. "What car?" A corolla I'm afraid. And Skippers Canyon Road I wouldn't wish on anyone, I only did a 1/2km before a difficult U-turn.)

As to the parking sensors "system fault", I am unable to diagnose, except that I would expect a front or rear bad parking sensor to fault only in the relevant gear selection? And they go off too often rather than too little, which seems the norm.

Bad connectors seems a likely problem from general computer experience, though goodness knows where they are. This is why our Jags have air suspension. So you can fit a Jaguar-trained specialist in the rear seat along with all his equipment, and still have the car level.

 

Hi. To check which sensor is faulty do the following: REAR SENSORS - engine off but ignition ON, foot on brake and select reverse. Once the loud continuous beeping stops go to the back of car and put your ear next to each sensor in turn. If working you will hear a faint clicking sound. No ticking indicates a faulty sensor (to replace, unfortunately, requires removal of rear bumper). FRONT SENSORS: As for rear sensor check, but select 'Drive' with ignition turned on - no clicking indicates faulty sensor (Once again, replacement requires bumper removal). Hope that helps.

 

Scanning with Car Soft will reveal which sensor(s) are faulty-mine did.

 

Brilliant Guys Many thanks yet again.

Strange turn of events today.... On my second week of owning this car, is actually going well.

I went to visit an exhibition at the Royal Cornwall Show Ground, On my way back I stopped for fuel. The petrol station is at the top of a hill so when I roared through my gap in the traffic and proceeded down hill the engine management light came on. Immediately thought EGR Valve! (they dont really work when the engine is not under load). So I pulled onto a car park that I knew has an upward slope. Stopped the car. put it in park and applied the handbrake, just so I could first check under the bonnet and underneath for anything obvious. All looked fine, and the engine appeared to be running as it always has done. So I thought blast it up the hill and we will know for sure if its just a soot'd sensor.

PARKING BRAKE FAULT!. Bloody electronic parking brakes. Unplugged the parking module, then plugged it back in. Brake released and no yellow light on the dash so it looks like my parking module needs replacing.

I took it to a local garage who plugged it into their diagnostics machine and the faults that came up:

EGR Sensor A
Parking module open circuit
Parking sensor fault 1
Parking sensor fault 1.

So I need a couple of sensors in my rear bumper.

As it happens I need to take the boot trim out to change my module for the parking and secure the cradle for the sat nav as it has a slight rattle (you can only hear this when you drop heavy stuff in the boot but its obviously loose and needs addressing. As this is all coming out I will whip the bumper off.

Many thanks again

 

Your description implies a connector problem (you said so!), rather than necessarily "parking module needs replacing".
Also implied by "Parking module open circuit". If you are getting that, then other error messages may be secondary?
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I'm a retired computer technician (big computer rooms not cars). I don't know how many times a large computer packed up, we replaced all the circuit boards and it worked, then restored the old circuit boards one-by-one and it still worked. I just took the credit whilst everyone still thought I was a computer expert.
90% likely some connector problem, is my unscientific certainty of probability. :-)