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Topic: wayward airbag dash warning light (Read 1626 times) |
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november_man
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wayward airbag dash warning light
« on: Apr 2nd, 2012, 11:14am » |
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greetings, is there a circuit diagram available for this system. the illumination can be quite intermittent , a bump in the road causing it to go off as well as bringing it on. it may seem daft but can it be affected by R/T. on the motorway nearby there is an electronic traffic monitoring array. the light can be off but you can guarantee that when the position is passed the light pops up ! there again it could be a bad connection somewhere, duff sensor ? any advice gratefully received
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Simmo
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Re: wayward airbag dash warning light
« Reply #1 on: Apr 2nd, 2012, 1:13pm » |
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The usual cause is a loose connection in the steering wheel. Have a read of This.
Also check out the details in the Electrical faults section of Fault finder.
Another place to check is the connections under the seat as rear passengers feet can sometimes disturb them.
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Tompion
Administrator
1997 2.3 Ultima estate.
Posts: 2918
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Re: wayward airbag dash warning light
« Reply #2 on: Apr 2nd, 2012, 3:36pm » |
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There have been several posts regarding a flickering airbag light over the years. Faults with components of the airbag system or their wiring should produce a flashing code as shown on the page that Simmo posted a link to.
A flickering or permanently on light is more likely to be either the power supply to the airbag module, a fault with the module or its connector/wiring to the dash, the dash connector or the dash itself.
Quite often with this problem people report slapping the top of the dash or pressing the instrument cluster will cause it to come on/go off.
Cleaning the connector behind the dash is often suggested, but as that connector has 6 other wires it is difficult to see why just the airbag light would be commonly affected – although having said that there are less common reports of problems with the cruise light, its pin is adjacent to the airbag pin.
I have found bad solder joints in the dash of my car & have had no problems since re-soldering them, however it was only a few weeks ago so difficult to say whether it was definitely the fault.
I plan to post more about it at some stage.
You can see some details here:
http://www.fordscorpio.co.uk/cgi-bin/yabb/YaBB.pl?board=Advice;action=di splay;num=1330135415
A link to the wiring diagrams can be found here:
http://www.fordscorpio.co.uk/cgi-bin/yabb/YaBB.pl?board=admin
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ABS multiplug wheel sensor pins MK IV or MK 20
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november_man
Junior Member
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Posts: 81
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Re: wayward airbag dash warning light
« Reply #3 on: Apr 3rd, 2012, 10:56am » |
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thank you for pointers. investigation underway
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Mike H
Senior Member
Renault Clio
 
Posts: 2594
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Re: wayward airbag dash warning light
« Reply #4 on: Apr 3rd, 2012, 12:44pm » |
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Safety note ~ before messing about with the actual airbag unit in the steering wheel (if it comes to that) disconnect battery and wait 30 minutes, or is it 45 minutes? To make sure it don't go off in your face! 
I'm only going by what some other experts wrote before 
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Mike H
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: wayward airbag dash warning light
« Reply #5 on: Apr 3rd, 2012, 12:45pm » |
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on Apr 2nd, 2012, 1:13pm, Simmo wrote:| Another place to check is the connections under the seat as rear passengers feet can sometimes disturb them. |
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I agree that's most likely first on the list.
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Mike H
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november_man
Junior Member
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Re: wayward airbag dash warning light
« Reply #6 on: Apr 3rd, 2012, 12:55pm » |
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postscript : investigation temporarily suspended, rain stopped play . as a matter of interest regarding wiring under front seats, I assume the airbag circuit is linked to seatbelt tensioning setup ?
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Tompion
Administrator
1997 2.3 Ultima estate.
Posts: 2918
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Re: wayward airbag dash warning light
« Reply #7 on: Apr 3rd, 2012, 2:21pm » |
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Yes plugs link to pyrotechnic pre-tensioners, although I believe early cars may not have pyrotechnic types. Later cars also have side airbags but I don’t know the location of the plugs.
You should find clips under the seats to keep the plugs out of harms way.
The plugs & sleeving for the wires for the system are yellow.
On this page it says “disconnecting the battery for twenty minutes”:
http://www.fordscorpio.co.uk/airbagmanual.htm
However within the PDF’s it says
“Wait at least 15 minutes after disconnecting the battery before disconnecting the electronic control module multiplug. For all other supplementary restraint system multiplugs wait two minutes. If these times are not observed there may be the possibility of accidentally deploying the air bag(s) and the pyrotechnic seat belt pre-tensioners.”
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ABS multiplug wheel sensor pins MK IV or MK 20
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november_man
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Posts: 81
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Re: wayward airbag dash warning light
« Reply #8 on: Apr 3rd, 2012, 7:07pm » |
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it would appear a previous owner has been here before me. no clips and a fistful of wires !
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a-way
Newbie
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Re: wayward airbag dash warning light
« Reply #9 on: Apr 4th, 2012, 9:05am » |
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My scorpio did the same but the flickering went of for moments if i slapped the dashboard... it bothered me so finally i changed the instrument panel and the airbag light flicker disappeared like magic... also i looked at the old instrument panel for cold solders and there were some so i think that were where the flickers originated.
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F Scorpio GHIA 2,5tdi 125bhp MT
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: wayward airbag dash warning light
« Reply #10 on: Apr 5th, 2012, 8:17pm » |
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on Apr 3rd, 2012, 7:07pm, november_man wrote:| it would appear a previous owner has been here before me. no clips and a fistful of wires ! |
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A-ha!!
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Mike H
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november_man
Junior Member
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Re: wayward airbag dash warning light
« Reply #11 on: Apr 6th, 2012, 11:37pm » |
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faffed about with wires and plugs under seats with some success, though not 100%however, light can also be induced to go off with severe beating of dash ! trouble is cruise control light is now behaving in sympathy. never had this problem with my QUAD 22.
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leewar
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Re: wayward airbag dash warning light
« Reply #12 on: Apr 7th, 2012, 11:23am » |
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Sounds like a removal of the instrument panel and a spot of soldering or a replacement panel 
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november_man
Junior Member
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Posts: 81
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Re: wayward airbag dash warning light
« Reply #13 on: Apr 11th, 2012, 1:00pm » |
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time to throw rope over rafters !
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leewar
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Re: wayward airbag dash warning light
« Reply #14 on: Apr 11th, 2012, 6:13pm » |
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It never gets that bad 
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november_man
Junior Member
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Re: wayward airbag dash warning light
« Reply #15 on: Apr 18th, 2012, 11:22am » |
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it does ! new problem
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