Going Backwards.. as normal.

puddle jumper · Post by **puddle jumper** » 03 Jun 2010, 22:10

Just when my MK1 c5 exclusive had lulled me into its comfort zone and I was just getting used to the spasmodic reminders it sends me about how its feeling, it threw a new one in.The rear parking sensors. Whilst parking last night, engaged reverse beep as normal then nothing. now on engaging reverse i get the normal beep followed by a longer higher pitched beep then still nothing. All looks normal No damage (YEt)

does any one have any troubleshooting tips please .....

Citroenmad · Post by **Citroenmad** » 03 Jun 2010, 22:16

Is the high pitched noise as if your car is telling you to stop as something is close?

Ive known the sensors go faulty and cause this problem, also if they are dirty or have moved it could also cause the same thing. If they are a Citroen item i think you can buy individual sensors.

puddle jumper · Post by **puddle jumper** » 03 Jun 2010, 22:24

Thank you for the quick reply, No the beep is a higher pitch and diffrent duration than the normal backing bleeps, I was just wondering if the reversing sensor sytem has its own diagnostics Like a blink code sort of thing or do i need the dreaded lexia

citronut · Post by **citronut** » 04 Jun 2010, 07:50

if you feel the need to hook up to a LEXIA, insted of paying the dealer,

check the the leximap on this forum for your nearest FCF member LEXIA owner as there are a few of use now,

regards malcolm

regards malcolm

wheeler · Post by **wheeler** » 04 Jun 2010, 08:40

Most likely a duff sensor, they usually fail due to water getting into them. Have a look at the sensor plugs behind the bumper first, you will usually see a nice green/white residue. because of where they are they are prone to getting water in them. If they all look ok have a look at the connections on the control unit located in the spare wheel well area, another water trap if you have any leaks.

Homer · Post by **Homer** » 04 Jun 2010, 20:31

puddle jumper wrote:on engaging reverse i get the normal beep followed by a longer higher pitched beep then still nothing.

It's a "failure" indication, to warn you the reversing sensor isn't working.

When I bought the 807 it needed a trim replacing on the rear bumper, while replacing that they broke one of the sensors. While we were waiting for a new sensor we got the same beeps.

KevMayer · Post by **KevMayer** » 04 Jun 2010, 20:43

I've had this twice on my C5. Each time i've wet a finger and wiped it over each of the 4 sensors and it's cleared the problem.

puddle jumper · Post by **puddle jumper** » 04 Jun 2010, 22:10

well thank you all for your contributions, i will have a look at the wiring when ican get it over the pit at work and report back.. thanks again much appreciated

Kowalski · Post by **Kowalski** » 07 Jun 2010, 11:17

You can replace sensors one at a time, by swapping one at a time, you should be able to find the faulty sensor.

I had to replace a sensor on my C5, its post facelift, so it uses an entirely different parking sensor system. On mine, the problem was intermittent and with the readout on the in dash display (post facelift only) I could see which sensor was giving incorrect readings. Swapping the suspect sensor with another sensor from the car moved the problem and confirmed a duff sensor which I then replaced.

French Car Forum

Going Backwards.. as normal.

Going Backwards.. as normal.

Re: Going Backwards.. as normal.