Hello all.... again. I recently posted about the parking (forward and reverse alarm) that stopped working and got some suggestions as to what may be the cause. I followed all those including checking the F29 fuse in the passenger foot well fuse box (It was fine) and replaced the Parking Control Module itself as several posters suggested water in the trunk may have shorted it. I've never had an issues with water in the trunk area but ordered a new module just to see if that was the cause. The 'P' switch in the overhead console also stopped functioning. A bad control module seemed like it would cause the entire system to stop functioning. Evidently it wasn't because after replacing the old with the new, the system still didn't work. My special Jaguar mechanic (not my regular guy) worked as a mechanic at the local (40 miles away) Jaguar dealership for 20 years and then retired and started his own repair shop specializing in older Jaguars. The dealership introduced me to him after they informed me they don't work on Jaguars built before 2010. He did a transmission repair and a couple other minor functions my regular mechanic doesn't have the right computer testers for, and when I asked him about this problem he said he hasn't worked on that particular issue every often but suggested and individual sensor may have disconnected or somehow stopped working and that would shut the system down.There are 8 sensors (4 front and rear) and all look like nothing has happened to them and I have no idea how to tell if one is bad. So if anybody has any suggestions as to what else may be the problem, I'd appreciate hearing from you. The fuse box location diagram and the list of what functions each fuse is responsible for is pretty complete, but I found no listing that specifically referred to the Parking Control Module or any language that I identified with that function other than a vague reference to parking control to fuse slot F29 for a 5 amp fuse. I got that location from another poster who responded to my original question, but that fuse is fine. I'm wondering if there isn't another fuse that handles that as well. I'm at a loss as to my next step. I really like that system. Thanks again.

 

An iCarsoft i930 or LR-II will scan and pinpoint the failed sensor. A cloned version of the factory SDD/IDS program will also do the same, but is far more complex to use.

I have used the LR-II to pinpoint a failed reversing sensor twice since acquiring my S-type five years ago.

 

Hi. Thanks for that. I just ordered the i930 on Amazon. We'll see what happens. Should have it tomorrow. A followup report when the mail arrives. Ed

 

Haven't tried this myself, but supposedly each sensor makes a faint clicking noise when in operation. A dead sensor won't make any noise. This video shows the test procedure on a Ford, which should be similar:



Note he has the engine running, as his car only has an on/off button for the engine. For our cars, you should be able to turn the key to Run but not Start, which would be a lot safer. You'll still want to park on a level surface, set the parking brake, and chock the tires to be safe before shifting into reverse.

 

I didn't know they made a clicking sound either. Hopefully this new device I ordered will tell me exactly which one, although I'm not sure how I will fix it when I do find out. I have an electronic parking brake and I don't think I can put the car in reverse and engage the parking brake like you can with a mechanical brake.

 

I also heard before about the clicking sound (which is kind of like the "clicking" ultrasound noise made by bats) of the sensors, and at one point I heard it too on my X-Type. I will check later on my S-Type.
I got the electric handbrake, too. You can actively pull it up to engage it, but I would not know, if that works while you are in reverse. So to do that safely, you need a little helper, who sits in the car, presses the brake pedal and goes into reverse - brake pedal still pressed firmly. Then you can go and listen for bats in the rear. Then in D or any of the other forward gears (with brake engaged) you can go and look for bats in front of the car...

 

Oops, hadn’t thought of that. This is NOT to be construed as me being the W word, but merely less correct than usual.

You could still easily test the sensors by parking on a level surface and chocking the tires. Do the test with the engine off and key to the Run position to energize the system when you shift into reverse. If for some reason the engine must be running, have a helper hold their foot on the brake pedal.

 

OK, I checked:
As I wrote before: I remember that I heard that sound with my ear on the sensor before on my X-Type some time ago. But I also remembered that I checked for that same ticking more recently and I could not hear it.
So now I checked again: I can neither hear it on the X nor on the S (engine not running and engine running in reverse), but both reverse systems work... Also: I quickly stuck a little funnel into a short bit of garden hose and used this as stethoscope - but no luck either...
Thus, I thought...: Maybe my hearing got that bad, that the ticking is there, but I just cannot hear it anymore.

Hence, I tasked my wife to listen thru the hose (on the funnel) and directly on the sensor (with engine off, but in reverse)...:
And - sadly - indeed: I just cannot hear that frequency anymore - my wife can hear it clear and loud - with and without made-up-stethoscope.
She describes it as some fast ticking like from a beetle, or from a wall-clock, but very fast, or like a bat...

So here you have it: If you cannot hear the sensor tick, it is either broken or your ear is broken...

Or to put it like that:
If it does not tick and you are lucky, the sensor is buggered.
If you are unlucky, your ear is buggered.
And if you are very unlucky, your sensor and your ear are buggered...

 

Interesting. Any chance you could feel the clicking if you lightly placed you fingertip on the sensor?

 

Hi Karl, no you can't feel the ultrasound, which - as I understand it - the sensor sends off for the purpose of echo-location to measure the time it takes for signals to bounce back to the "sender" in case of an obstacle being present, where the signal can bounce back from, so that the distance is known (just as bats and submarines do it)...

I am not quite sure, which frequency Jaguar - or the parking-aid supplier for that matter - chose. But ultrasound means typically 20kHz, but also a few thousand Hz below. I am sure that I could hear 20kHz when I was young, but as I was able to hear the parking aid ticking about 2 years ago, I assume the frequency is quite a bit below 20kHz, but as I cannot hear it anymore, it would be 8kHz or a few thousand Hz above that...

Or to put it differently: If your parking aid works and you want to check your hearing, holding your ears to the sensors could save you the trip to the audiometrist (who checks up on your hearing)..

 

Yes use two people! I get the wife in the drivers seat and then move the shifter from P to D and to R. With your ear against the sensor it will be obvious if they are emitting anything or not.

But we really need some codes. Hopefully your Icar scanner will help narrow down where the problem is.
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Wow! My mother warned me what would happen to my eyesight, but she never mentioned anything about my hearing.

 

She did, but you just didn't hear her.

 

Ain't Amazon Amazing?? I plugged it in and ran the diagnostics for the Parking Control Module. It came back with one error as shown below. I have no idea what it means.Anybody?? Thanks.

 

Information from the "other" Jaguar Forum:

Parking Sensor Code | Jaguar Forum

 

If it is just a sensor when you engauge reverse the system will bleep at you.
I use the jaguar SDD software to tell me what sensor is faulty.

If you get no sound at all, then there is a fault with the parking module or the power to it.

On my 05MY STR the sensors do not make any clicking noise at all, even when they are all working.

Mellow

 

Hi Mellow,
as I pointed out above: If your reverse sensors/system work and you hear no clicking, that does not necessarily mean, that there is no clicking. Ask someone who is young, if they can hear your sensors clicking...
There is a good chance, that you do not hear that frequency...

 

Okay, I get no system "beep" when I go into reverse, and it can't be the module as I have already replaced that. So now I am left with a power problem which is going to be harder to diagnose.My i930 scanner screen shows "Power Supply Sensor-Short to ground". Whatever that means. Thanks again for the help.

 

+1 on that. I've currently got a dead sensor on my '02. My 60-year-old ears could not hear the clicking, even with my ear pressed right against the sensor.

So I broke out my Steelman Engine Ear electronic stethoscope (HIGHLY recommended):

https://steelmantools.com/products/e...ar-stethoscope

With a little electronic assist, I could clearly hear 3 sensors clicking normally and 1 not so much.

 

Hi Karl, yes, it was quite sad when I had to realize myself, that I don't have the hearing of a bat anymore as in the past...

Hi Fh,
> My i930 scanner screen shows "Power Supply Sensor-Short to ground". Whatever that means. Thanks again for the help.
If the issue turns out to be the wiring (short) of one of the sensors, it could still be possible that the other sensors work, hence the suggested "hearing test".
If there is no "bat-signal" being send out by any of the sensors, there may be a short in the power supply cable to the module (or a fuse blown, or both). Did you ever pull out the power supply cable (from the module) and measure the voltage on that cable when you are in reverse?