SRS light on

Hi
Just had a word with Darren and he's not sure whether the 001600 or the 103380 came off single or twin airbag cars.
He doesn't do any reprogramming just removes parts and sells them on.
Wondering which way either of you would go if i change the dcu.
Regards
Pete.

Personally I would go for 001600, but in the same time I would make sure I can return it back if it does not suit the purpose.

One question: do you still have posibility to connect PScan and inspect DCU you have on the car? If you can, can you make screenshot of what info you get when hit Information button under EC5/RC5 airbag ECU interrogation?

I’ve invested in 00160 myself & that is the way I would be going, it’s a shame you aren’t closer & we could pass one of mine over. On balance the loan of one doesn’t worry me one iota, the getting it both ways safely & with zero hassle, is the other side of the balance.
Darren is wanting £30 as I recall, there will be carriage, like the cherry, on top; did you look at the one from BAS in Bradford?
I’ve never needed to return to him so I’ve no idea what his policy is.
On a side note, you say your controller is an Autiliv device, I haven’t seen any device used in our airbag systems with that name other than on later tf’s, just as Roverlike has said.
M

Hi
When i spoke to Darren i did ask if i could return the part but he said its like I'm using them for testing purposes so no luck there.
Not sure if the screenshot tells you anything.
The dcu was manufactured Nov 1994 and i go into the system using ec5/rc5
Both airbags autoliv.
Regards
Pete.

 

 

Some progress i fitted a dcu 103380 off ebay a couple of days ago and the srs light went out. I checked it a few times that evening and again the following morning all good.
I then bolted down the dcu and tightened the two bolts on the fuse box under the dashboard, then re-checked the srs and the light came back on.
The pscan gives the same error code C150 front airbag cicuit driver high resistance.
The light has been intermittent, i have had the fuse box back down and disconnected the yellow block connector and cleaned the terminals all seems well.
I'm not sure if I've got two faults or wether the dcu I've just bought has the same fault as the original.
Also changing the dcu was a bit of a guess as i couldn't pinpoint the fault exactly.
Hope Roverlike and Airportable see this.
A known dcu would be good if anyone has one.
Regards
Pete.

Can you unbolt the DCU again and leave it unbolted and check if you will still have the SRS light on?

Also have you checked your original DCU connected but unbolted to its place, to see if in such position you will have the same error?

Hi Roverlike
I have unbolted the DCU and the SRS light is still on. Also slackend off the fuse box, given it a shake, the light is still on and no flickering.
Also refitted the original DCU left it unbolted, the SRS light is still on.
The error is the same for both DCU's.
The only thing ththe at differs, is that with the original DCU, the SRS light comes on for about 3 seconds goes out and comes back on in a second or two and then remains on.
The ebay DCU, SRS light comes on and remains on.
When i first fitted the ebay DCU it was perfect, I cleared the error codes and pscan remained clear. [ i was doing cartwheels ].
It was the next day it threw a wobbly after bolting down the DCU and tightening the fuse box.
I have also rechecked the little earth wire, that comes out of the SRS harness and bolts onto the tunnel by the DCU.
I went for the 103380 because my car is old, and it was the same number from a 2000m/y.
Don't go on holiday
Thanks again
Pete.

I look at your message earlier on before I went to church & noted your help request.
On returning we set of for some time away, now having stopped for a breather I am having a look in & noticed your final line.
I will keep an eye on progress but I’m unlikely to be of any physical help. Sorry.
M

What boders me is that you got situation in which you could clear the error and it did not return back. Then something is changed and error is back.

Since you said that error returned when you bolted DCU and fusebox I am investigating what could disturb the situation in that area. This is a long shot, but since three signals have interconnection in wires, although they are not related to drivers airbag, might be worth to recheck that connections. Signals that have interconnection are power to the DCU, OBD port signal and instrument pack lamp. They are passing through interconnections C0223-C0047 and C0273-C0305  on the below picture in the fuse box (shown below). Maybe worth to recheck that connectors and clean them.

 

Only other thing in my mind which could make this kind of ghost error (which is present under some circumstances) is rotary coupler. This spring of wires can start breaking and although when measured you cannot see it as problem, as soon it is touched under different circumstances it makes problem. 

Since you have dedicated wires for airbag in rotary coupler, you cannot use different (free available, not used) wires that easily. That means replacement rotary coupler should be used.

I’m not sure how much it would cost to buy an entire SRS loom (the full nine yellow yards) from a reputable used part supplier, Darren for instance.
I really can’t see there being two faulty modules & maybe it’s time to work towards the dynamic ends ‘bags & bangers’.
I’m not sure just what my next move would be under your circumstances.
M

So it worked OK before it was screwed down but when you secured it it played up yeah?  I doubt any of the following are the problem but considering all else that's been tried maybe it's time to eliminate some of the oddball possibilities......have you tried it after having loosening it again? I'm wondering if when secured it's purhaps putting tension on the wiring?  or How easy does it screw down? Is there a lot of tension perhaps distorting it as you screw it down? if screwing it down causes a twist in the circuit board maybe that's a problem by opening a dry joint?