Parking sensor fault 159, help! - Alfa Romeo Forum
You are currently unregistered, register for more features.    
Reply
 
Thread Tools Search this Thread
(Post Link) post #1 of 50 Old 22-05-15 Thread Starter
HTA
Status: --
AO Member
 
HTA's Avatar
 
Join Date: May 2015
Location: Norway
Parking sensor fault 159, help!

I have a fault with my parking sensor on my 159.
When I start up and put it in reverse I get a long beep and then in the display "parking assistance not available"
I had had a go at it with a fault reader and it said circuit shortage or something like that. I understood that there was a problem with the power supply. It did not say if there was a specific sensor.
I looked at the wires to the front sensors first, and could not find anything that could look like a fault.
And when I disconnected the connector to the front set there was no difference.

But when I disconnected the connector to the sensors at the rear bumper I got fault code for all the rear sensors, and the original "power shortage" fault disappeared.

So I can conclude that the fault is with one of the rear sensors?

Are there some typical places I can look for a fault?
And do the rear bumper need to come of to get access?

Last edited by HTA; 22-06-15 at 16:44.
HTA is offline  
Sponsored Links
Advertisement
 
Status: #RussiansDidIt
AO Silver Member
 
Join Date: Aug 2013
Location: Russian Federation
County: St. Petersburg
All parking sensors are connected onebyone what is why complete system faulty.
Ecuscan should tell you which one is faulty.
If no proper software I would buy single sensor as is. It is not to pricy.
Rear bumper is to be stripped off. 4 bolts+8screws.
change each onebyone and see reaction. Should help.
Make sure park sensor to be painted bumper colour.
BuonGiorno is offline  
Status: #RussiansDidIt
AO Silver Member
 
Join Date: Aug 2013
Location: Russian Federation
County: St. Petersburg
Two bolts under lamps. Sorry...
Lamp has three nuts each.
BuonGiorno is offline  
Status: -
AO Silver Member
 
IAMBRERA's Avatar
 
Join Date: Aug 2014
Location: Jamaica
County: Saint Ann Parish
I'm conviced it's the battery being slighty low of voltage. If i've not driven mine for a few days mine do the same. But if i go for a long enough drive the alternator seems to replace the charge needed & the P symbol goes away & the sensors work again.

I've had this on & off for 2 years or so now. Sometimes they only beep when i'm right on top of an object ( with the P off the dash display & no warnings of Park assist unavailable on start up ) just before i touch an object, with a rapid set of beeps, then a continuous beep making me having to jam on because i was relying on them.
But sometimes the big P is on the dash then when i reverse it all of a sudden goes away & works normally, when i'm not expecting them to.
I've come to not rely on them & rely on my own technique of checking where i'm reversing, so i would not necessairly say it's a faulty sensor. All i know is a lot of people have had this fault

Last edited by IAMBRERA; 22-05-15 at 20:57.
IAMBRERA is offline  
(Post Link) post #5 of 50 Old 04-06-15 Thread Starter
HTA
Status: --
AO Member
 
HTA's Avatar
 
Join Date: May 2015
Location: Norway
The fault code that came up on the reader was something like this:
"C1009 Power supply shortage"

Last edited by HTA; 23-06-15 at 12:15.
HTA is offline  
Status: Extra miaow
AO Member
 
Malheus's Avatar
 
Join Date: Apr 2011
Location: Sweden
County: Norrbotten
Images: 5
Garage
Getting 12 Volt to the Parking sensor ECU?
Malheus is offline  
(Post Link) post #7 of 50 Old 05-06-15 Thread Starter
HTA
Status: --
AO Member
 
HTA's Avatar
 
Join Date: May 2015
Location: Norway
Quote:
Originally Posted by Malheus View Post
Getting 12 Volt to the Parking sensor ECU?
Dont know...
Where can i find the parking sensor ECU?
HTA is offline  
Status: Extra miaow
AO Member
 
Malheus's Avatar
 
Join Date: Apr 2011
Location: Sweden
County: Norrbotten
Images: 5
Garage
Most parking sensors ECU's are fitted in the luggage, check behind the clothing
Malheus is offline  
Status: Fingers crossed no more expense.
AO Member
 
Waquer159's Avatar
 
Join Date: Nov 2012
Location: United Kingdom
County: Devon
I had a problem with my rear parking sensors in that they suddenly didn't work. I checked and noticed the reversing light was not working also. Couldn't find a fault with the circuit but took the reversing bulb out and they worked. Bulb back in nothing.... was totally flummoxed. I had an LED bulb that would fit it, put it in and everything worked again.
Waquer159 is offline  
Status: #RussiansDidIt
AO Silver Member
 
Join Date: Aug 2013
Location: Russian Federation
County: St. Petersburg
Quote:
Originally Posted by Waquer159 View Post
I had a problem with my rear parking sensors in that they suddenly didn't work. I checked and noticed the reversing light was not working also. Couldn't find a fault with the circuit but took the reversing bulb out and they worked. Bulb back in nothing.... was totally flummoxed. I had an LED bulb that would fit it, put it in and everything worked again.
I would check a switch activating reverse light first.
Switch is located at front of gearbox under bonnet.
May depends on engine version.
BuonGiorno is offline  
Status: -
AO Member
 
zoomers's Avatar
 
Join Date: Dec 2008
Location: United Kingdom
County: Durham
Just sorted my rear parking sensors on my Brera, the fault i had was, 'parking help unavailable'. If you put the car in reverse, touch the sensors one at a time and you should be able to hear the working ones 'tick' when you put your fingers near them. I had the middle two off, bought two replacements from ebay 20 each (valeo sensors) and once sprayed to match car colour (15 halfords) i replaced them and all is good. Had to remove my bumper on the Brera.
zoomers is offline  
Status: -
AO Member
 
samisnake's Avatar
 
Join Date: Nov 2009
Location: LDN
County: -
Quote:
Originally Posted by zoomers View Post
Just sorted my rear parking sensors on my Brera, the fault i had was, 'parking help unavailable'. If you put the car in reverse, touch the sensors one at a time and you should be able to hear the working ones 'tick' when you put your fingers near them. I had the middle two off, bought two replacements from ebay 20 each (valeo sensors) and once sprayed to match car colour (15 halfords) i replaced them and all is good. Had to remove my bumper on the Brera.
gotta replace one on my misano brera. got the sensor, the paint and laquer, just need primer and a day off now.

how many coats of each did you put on?
does it look as good as the original in terms of paint finish.

gonna put my numberplate light camera in while im at it
samisnake is offline  
Status: -
AO Member
 
zoomers's Avatar
 
Join Date: Dec 2008
Location: United Kingdom
County: Durham
i masked off most of the sensor, plug in end and gave them a good clean with some cleaner so the paint would take. Gave pine about 4 light coats of top coat colour until they looked well covered but not too thick, (best to get the paint spraying in a bag or somthing first to make sure its a fine spray). one coat of lacquer on mine and the match is good , you only see the end face anyway
zoomers is offline  
Status: -
AO Member
 
Join Date: Dec 2013
Location: United Kingdom
County: Rutland
I had a rear sensor go faulty a couple of months ago, but it started to work again. I can only think it had got a bit wet....
R159 is offline  
(Post Link) post #15 of 50 Old 07-06-15 Thread Starter
HTA
Status: --
AO Member
 
HTA's Avatar
 
Join Date: May 2015
Location: Norway
Quote:
Originally Posted by Malheus View Post
Most parking sensors ECU's are fitted in the luggage, check behind the clothing
Any idea on what side?
HTA is offline  
(Post Link) post #16 of 50 Old 07-06-15 Thread Starter
HTA
Status: --
AO Member
 
HTA's Avatar
 
Join Date: May 2015
Location: Norway
Found out that the ECU is located in the RHS in the trunk behind the carped.
Will have a look tomorrow at the ECU for obvious faults and also check the revers lights and switch.
And do a "click" test
HTA is offline  
Status: No more Spider
AO Member
 
R50 MEO's Avatar
 
Join Date: Feb 2009
Location: United Kingdom
County: Derbyshire
Anyone know how much one of these ECUs costs?
R50 MEO is offline  
(Post Link) post #18 of 50 Old 09-06-15 Thread Starter
HTA
Status: --
AO Member
 
HTA's Avatar
 
Join Date: May 2015
Location: Norway
The reverse light works.
Did put the car in reverse several times and listened for any sounds and felt for "ticks" from the rear sensor.
I could not hear or feel anything...
HTA is offline  
(Post Link) post #19 of 50 Old 11-06-15 Thread Starter
HTA
Status: --
AO Member
 
HTA's Avatar
 
Join Date: May 2015
Location: Norway
Any ideas where my problem can hide?
HTA is offline  
Status: #RussiansDidIt
AO Silver Member
 
Join Date: Aug 2013
Location: Russian Federation
County: St. Petersburg
Quote:
Originally Posted by HTA View Post
Any ideas where my problem can hide?
Strip bumper and check manually.
BuonGiorno is offline  
(Post Link) post #21 of 50 Old 15-06-15 Thread Starter
HTA
Status: --
AO Member
 
HTA's Avatar
 
Join Date: May 2015
Location: Norway
Quote:
Originally Posted by Malheus View Post
Getting 12 Volt to the Parking sensor ECU?
I do think so. The ECU is making the beep rigt?

Last edited by HTA; 23-06-15 at 12:06.
HTA is offline  
(Post Link) post #22 of 50 Old 22-06-15 Thread Starter
HTA
Status: --
AO Member
 
HTA's Avatar
 
Join Date: May 2015
Location: Norway
I fiddled around a bit with the wires to the ECU, gave the ECU some gentle taps and fiddled with the connector behind the rear bumper. And then suddenly the parking assistance worked fine. I drive it around a bit right after i found out that it worked just to test it.
Finally i thought..... but...
Then in the morning after it was back to "parking assistance not available" again.

Bad connection somewhere, or faulty ECU?

Anyone had a similar experience?
HTA is offline  
Status: #RussiansDidIt
AO Silver Member
 
Join Date: Aug 2013
Location: Russian Federation
County: St. Petersburg
I have had a small accident in past.
Just a little touch with my rear bumper without any visible results.
But it was enough to get a crack on a sensor socket which make a problem finally.
I do not believe ECU. At least you can switch one from a good car.
The rest are inside bumper. You need to go through. Sorry for insist.
BuonGiorno is offline  
(Post Link) post #24 of 50 Old 10-07-15 Thread Starter
HTA
Status: --
AO Member
 
HTA's Avatar
 
Join Date: May 2015
Location: Norway
Ill change the connector that i can access from under the rear bumper. It looks ok, but easy to change to rule that one out. It is out in the open so maybe some water damage could have happened.
I will update when the connector has been changed with another waterproof connector.
HTA is offline  
ocp
Status: -
Newbie
 
Join Date: Oct 2014
County: -
Quote:
Originally Posted by R159 View Post
I had a rear sensor go faulty a couple of months ago, but it started to work again. I can only think it had got a bit wet....
I used got an error but every time it rained, sometimes when I washed it, it got back to life.

Now it is dead no matter what the weather.

Will have to check it properly...
ocp is offline  
Reply

Go Back   Alfa Romeo Forum > Supported Alfa Romeo Models > Technical & Vehicle Assistance > Alfa 159, Brera & 946 Spider

Tags
159 , fault , parking , sensor

Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome