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Old 21st May 2019, 15:49   #1
bigblue75
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Default Continuous Airbag Light

Had the airbag light come on and "airbag fault" show when I started the car earlier. Previously fixed this in my last 75 by disconnecting and reconnecting the blue and yellow underseat connectors but not this time.
Have checked the carpets around the side impact sensors and both sides dry so read a little from the forum and came across the post

https://the75andztclub.co.uk/forum/s...2&postcount=39

The airbag light on my dash remains on continuously from posII to starting and beyond. I also found that removing fuse 18 before restarting the car has no effect on the dashboard airbag light which stays lit until the key is turned to stop the engine.

Do these symptoms indicate a faulty DCU? is there anything else I can check before replacing the SRS DCU and having it configured to the car?

Thanks in advance.

Last edited by bigblue75; 21st May 2019 at 15:51..
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Old 21st May 2019, 15:54   #2
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I had the light displayed on one car I acquired, and it did not disappear until I gently moved the connectors in the plugs, just to bend them slightly but without undue force.

The only time is showed since was during severe rain storms so I think that was probably due to condensation.

good luck.
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Old 21st May 2019, 16:31   #3
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I also use electrical contact cleaner, sprayed into the connectors.
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Old 21st May 2019, 18:17   #4
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I had the airbag light on permanently, and it was down to corrosion on the side impact sensor under the carpet. If you have ever had water under the carpets this will cause the problem. There are two sensors, one under each front seat, and there are two colour variations dependant on your vehicle model, one is orange and one is green.
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Old 21st May 2019, 18:20   #5
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I reckon you should have it diagnosed properly Joe, otherwise it could be absolutely anything

Brian
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Old 21st May 2019, 18:52   #6
bigblue75
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Awaiting a cruise kit which will need configuring to the car so will try to get to a T4 for this and a diagnosis of the airbag fault in one session.
Had hoped for a definite "yeah, that's the SRS DCU goosed" kind of answer- would have picked one up to take along while having the cruise sorted.

Thanks for the assistance.
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Old 22nd May 2019, 16:10   #7
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I had the same problem even after the connectors had been checked, it turned out to be the Air Bag ECU which was replaced by Jules and reprogrammed for my car with his T4
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Old 22nd May 2019, 16:20   #8
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I take it that you have checked under both front seats?
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Old 23rd May 2019, 07:15   #9
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Have tried to rule out the usual suspects. Am going to get a diagnosis on the issue when I get the cruise control configured to the car- as MarinaBrian has said, it could be anything and a T4 session will cut out the guess work (and a possibly unnecessary part purchase).
Thanks for your interest and comments.
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Old 23rd May 2019, 17:12   #10
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I had a faulty SRS ECU and a soaked side impact detector.
when ecu is faulty, the srs warning indicator lamp will be lit constantly.
After replacing to a working ecu but with still a defect side impact detector. the sequence after ingnition on was:
lamp on for ca 4 sec followed by a short period when it's of (SRS test period) then on again as there was a fault in the impact sensor.

after replacing the side impact sensor, the sequence was still the same, indicating a fault (although there now is any) until you have a T4 system connected and the ecu is programmed with the right WIN number.

btw is't time consuming to get to both the ECU and the side impact detector. lot's of stuff need to come out. (center console with radio, navigator and heat panel. front seat, etc )

I found a used SRS ECU on ebay for 25€
Good luck.
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