Not Another Parking Sensor Question!

shed17 · 18th March 2008, 10:28

Was pointed to this forum by Les at SMC.

The reversing sensors had failed on the ZTT as all I was getting was the long beep.

So after reading loads of threads about what can go wrong, thought that I had covered all the bases.

Listened to each sensor for a clicking noise - silence! So replaced all four sensors.

Put car in reverse, reversing light comes on, long beep

.

So replaced the control box, the reason that Les sent me here, engaged reverse, reversing lights go on and now nothing! No long beep, no clicking sensors. Put the original control box back in and get long beep but no clicking

.

Checked that it was the correct control box and model numbers match!

Can anybody help before I go totally mad

dionh · 18th March 2008, 17:26

Your problem is almost certainly caused by the wiring loom behind the rear bumper. I had exactly the same on my ZTT.
You will have to remove the bumper, disconnect the loom and check for continuity to each sensor. If yours is like mine was, you will find corrosion in two or three places. Remove the corroded bits and re-connect, making sure your new joints are well protected. It's a tough environment back there!
You will find more detailed info in other posts on here.
Best of luck,
Di.

shed17 · 18th March 2008, 18:33

Di,

Thanks for the reply. The wiring loom was the one thing that I did not carefully check as it looked OK on a quick examination.

What are the areas that you talk about that are prone to corrosion?

dionh · 19th March 2008, 11:58

You will probably find that the break is where the cable from the PDC (parking distance controller) splits into 4 black wires (1 for each sensor) under the bumper - at least that is where mine was. Unwrap the insulation tape and check the crimp for corrosion and a broken wire. While you're at it, check all the other wires for continuity with a multimeter.
Have fun,
Di.

alwal0307 · 21st March 2008, 20:31

hi I had the same problem found to be the Wiring corroded cost £50 with a auto elecy!

18th March 2008, 10:28	#1
shed17 Newbie MG ZTT Join Date: Mar 2008 Location: Scotland Posts: 10 Thanks: 0 Thanked 0 Times in 0 Posts	Not Another Parking Sensor Question! Was pointed to this forum by Les at SMC. The reversing sensors had failed on the ZTT as all I was getting was the long beep. So after reading loads of threads about what can go wrong, thought that I had covered all the bases. Listened to each sensor for a clicking noise - silence! So replaced all four sensors. Put car in reverse, reversing light comes on, long beep. So replaced the control box, the reason that Les sent me here, engaged reverse, reversing lights go on and now nothing! No long beep, no clicking sensors. Put the original control box back in and get long beep but no clicking. Checked that it was the correct control box and model numbers match! Can anybody help before I go totally mad

21st March 2008, 20:31	#5
alwal0307 Regular poster Rover 75 Connoisseur se cdt Tourer also Mini Cooper Diesel & BMW Z3 Join Date: Mar 2008 Location: Wigan Posts: 45 Thanks: 0 Thanked 0 Times in 0 Posts	same problem hi I had the same problem found to be the Wiring corroded cost £50 with a auto elecy!

18th March 2008, 17:26	#2
dionh Regular poster MG ZT-T cdti 135 Join Date: Nov 2007 Location: Monmouth Posts: 96 Thanks: 0 Thanked 2 Times in 2 Posts	Your problem is almost certainly caused by the wiring loom behind the rear bumper. I had exactly the same on my ZTT. You will have to remove the bumper, disconnect the loom and check for continuity to each sensor. If yours is like mine was, you will find corrosion in two or three places. Remove the corroded bits and re-connect, making sure your new joints are well protected. It's a tough environment back there! You will find more detailed info in other posts on here. Best of luck, Di.

18th March 2008, 18:33	#3
shed17 Newbie MG ZTT Join Date: Mar 2008 Location: Scotland Posts: 10 Thanks: 0 Thanked 0 Times in 0 Posts	Di, Thanks for the reply. The wiring loom was the one thing that I did not carefully check as it looked OK on a quick examination. What are the areas that you talk about that are prone to corrosion?

19th March 2008, 11:58	#4
dionh Regular poster MG ZT-T cdti 135 Join Date: Nov 2007 Location: Monmouth Posts: 96 Thanks: 0 Thanked 2 Times in 2 Posts	You will probably find that the break is where the cable from the PDC (parking distance controller) splits into 4 black wires (1 for each sensor) under the bumper - at least that is where mine was. Unwrap the insulation tape and check the crimp for corrosion and a broken wire. While you're at it, check all the other wires for continuity with a multimeter. Have fun, Di.