Parking sounder not working after ignition off

richw · 10th July 2022, 21:10

Hi all,

I have a spot of bother with my Connie SE. It is an 02 plate, and I think was built in August 2001. It has parking sensors and the sounder in the parcel shelf.

I had a faulty sensor, which I identified and replaced using TOAF. But I have now observed that when the ignition goes off, the sounder stops working (for the next time I turn it on). If I open TOAF, go to PDC, then press Save, the sounder starts working! But only until I turn the ignition off!

When it works, the entire system works perfectly. When it doesn't work,sticking the car in R doesn't make a sound (no long beep, as you would expect with a faulty sensor).

So I suspect something is broken in the PDC control unit, perhaps the nonvolatile memory? Or would an issue with the sounder cause this? Or something else? I am at a loss as to what I should try next.

Any suggestions would be welcome.

Mike Noc · 11th July 2022, 08:24

Are you sure you haven't changed anything when using TOAF?

richw · 11th July 2022, 19:51

To be perfectly honest, no!

I actually looked at this on two separate occasions. The first, when changing the sensor, I noticed that the live data looked good, but the sounder wasn't working. Then I tried flipping the sounder setting (gong or loudspeaker). And it started working. I thought it was good. But next time I drove, it didn't work. And now I managed to conclude that the act of pressing 'save', regardless of changing anything, fixes it!

If I try the other sounder setting, I hear a faint dull buzz, like it isn't sounding properly. This makes sense, since I believe my car has a parcel shelf sounder, rather than the IPK one.

Anyone got a note of the default settings for all the PDC options, just in case?

richw · 11th July 2022, 20:10

Ah, typical... At first I couldn't find anyone with the problem. But now,it has happened to three other people! Sadly, no resolution.

https://the75andztclub.co.uk/forum/s...8&postcount=13

richw · 22nd July 2022, 20:45

OK, quick follow up. I found a couple more threads on here with the same issue, but sadly no resolution.

I took apart the loom and parking ecu in the boot. All looked fine (not wet!).

I discovered that if I unplug and re-plug the sensors, then they work (until power off). So it is nothing to do with me pressing Save in Toaf.

Then I had a brainwave. The reason for me messing on in the first place was because I had a broken sensor, which I was replacing with a new one. Toaf is useful for this.

I removed my new sensor and powered off/on. Now I get the immediate long error beep when I select reverse. Good!

I replaced the sensor with another I had lying around. And now it works across power off/on!

So my replacement sensor must have been a bit iffy. It works, but stops the system working at the initial power up. Lord knows why.

Just thought I would update here for completeness.

10th July 2022, 21:10	#1
richw Avid contributor Rover 75 Saloon Join Date: Sep 2017 Location: Stockton-on-Tees Posts: 243 Thanks: 6 Thanked 64 Times in 49 Posts	Parking sounder not working after ignition off Hi all, I have a spot of bother with my Connie SE. It is an 02 plate, and I think was built in August 2001. It has parking sensors and the sounder in the parcel shelf. I had a faulty sensor, which I identified and replaced using TOAF. But I have now observed that when the ignition goes off, the sounder stops working (for the next time I turn it on). If I open TOAF, go to PDC, then press Save, the sounder starts working! But only until I turn the ignition off! When it works, the entire system works perfectly. When it doesn't work,sticking the car in R doesn't make a sound (no long beep, as you would expect with a faulty sensor). So I suspect something is broken in the PDC control unit, perhaps the nonvolatile memory? Or would an issue with the sounder cause this? Or something else? I am at a loss as to what I should try next. Any suggestions would be welcome.

11th July 2022, 08:24	#2
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,551 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Are you sure you haven't changed anything when using TOAF?

11th July 2022, 19:51	#3
richw Avid contributor Rover 75 Saloon Join Date: Sep 2017 Location: Stockton-on-Tees Posts: 243 Thanks: 6 Thanked 64 Times in 49 Posts	To be perfectly honest, no! I actually looked at this on two separate occasions. The first, when changing the sensor, I noticed that the live data looked good, but the sounder wasn't working. Then I tried flipping the sounder setting (gong or loudspeaker). And it started working. I thought it was good. But next time I drove, it didn't work. And now I managed to conclude that the act of pressing 'save', regardless of changing anything, fixes it! If I try the other sounder setting, I hear a faint dull buzz, like it isn't sounding properly. This makes sense, since I believe my car has a parcel shelf sounder, rather than the IPK one. Anyone got a note of the default settings for all the PDC options, just in case?

11th July 2022, 20:10	#4
richw Avid contributor Rover 75 Saloon Join Date: Sep 2017 Location: Stockton-on-Tees Posts: 243 Thanks: 6 Thanked 64 Times in 49 Posts	Ah, typical... At first I couldn't find anyone with the problem. But now,it has happened to three other people! Sadly, no resolution. https://the75andztclub.co.uk/forum/s...8&postcount=13

22nd July 2022, 20:45	#5
richw Avid contributor Rover 75 Saloon Join Date: Sep 2017 Location: Stockton-on-Tees Posts: 243 Thanks: 6 Thanked 64 Times in 49 Posts	OK, quick follow up. I found a couple more threads on here with the same issue, but sadly no resolution. I took apart the loom and parking ecu in the boot. All looked fine (not wet!). I discovered that if I unplug and re-plug the sensors, then they work (until power off). So it is nothing to do with me pressing Save in Toaf. Then I had a brainwave. The reason for me messing on in the first place was because I had a broken sensor, which I was replacing with a new one. Toaf is useful for this. I removed my new sensor and powered off/on. Now I get the immediate long error beep when I select reverse. Good! I replaced the sensor with another I had lying around. And now it works across power off/on! So my replacement sensor must have been a bit iffy. It works, but stops the system working at the initial power up. Lord knows why. Just thought I would update here for completeness.