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Crackers
Member Since: 18 Sep 2013
Location: Camberley, Surrey
Posts: 142
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Hi All,
Airbag light came on during that cold snap. My indy cleared all fault codes but the airbag ones persisted. Light still on. Specialist AirBagMan visited today and diagnosed the airbag ecu (seems to also be called restraint control module) is shot (from the fault codes) and needs replacing. No accidents/impacts/airbag deployments ever to my knowledge. Had car 4+ years and heritage before then known.
Before replacing Airbag ECU (£400+ for a new one - gulp!), just keen to know if anyone else has had similar experience and found it to be:
a) Caused by something else when you thought the ecu was knackered (have read lots about loose wires and clock spring)
b) OK to replace with a salvaged part (e.g. £40 to £100 on fleabay) or definately go genuine part/pattern part
I understand it's located under the carpet, under the centre console cubby. Any advice on getting to it greatly appreciated! I'd let a pro do the airbag stuff....
Cheers!
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 5th Mar 2018 8:29 pm |
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Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1782
  
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Main criteria - disconnect battery before doing anything related to air bag. Could be bad connector on the RCM
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| 6th Mar 2018 10:33 am |
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Crackers
Member Since: 18 Sep 2013
Location: Camberley, Surrey
Posts: 142
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Apologies for bumping my own post, but...
Airbag light still on. Local Indy checked and cleared fault codes again. These ones won't clear:
U1A00
U0073
B1A55
U0155
Reading other posts, all of these codes have been experienced by others and successfully cleared...
Mine is an early base model with Cruise Control. Cruise Control buttons work on the steering wheel (although they were intermittent a couple of years back!) and operate the HDC OK too. Makes me think clock spring might be OK...?
No fancy heated or power operated seats, so little visible wiring under the seats. Had a poke about but not much to wiggle about under there.
I'm no further forward establishing whether it's the RCM, Clock Spring, a loose connector or damaged wire...
Any ideas before I start throwing parts/money at it? I'd welcome recommendations for experts in the South who might be able to help too! (Don't say Airbag Man Ltd of Camberley  )
Cheers!
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| 16th Apr 2018 6:35 pm |
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Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1782
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"B" type faults are hard to find but this document may assist you.
sorry, pdf file will not post
Can someone indicate how to do it as it would be long in a post
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| 16th Apr 2018 10:17 pm |
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parrafin23
Member Since: 04 Dec 2011
Location: Buskeud
Posts: 678
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As the others are saying, forget the U codes for now.
You need to check the B1A55 code. it's description is Crash record circuit short to ground or open.
I had exact same issue on my 2005. I tried to reflash the module, to no aid. I did trace that single wire.. It goes from the module towards the rear seats then over to the driver side (uk) then forward and ends up in a joint by the A pilar where it splits to a connector. the other side of this is not connected to anything. Back to the splice. this leads up and behind the BCU and connects to this.
As I have understood this wire and its purpose is to transmit a signal to the bcu when a crash has been detected, this activates the 4ways and cuts the fuel pump amongst other things.
My fix was to replace the module. If i remember correctly i gave £99 for a brand new pre programed to my vin from TLO back in the says..
Mr.P
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| 17th Apr 2018 12:59 pm |
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Crackers
Member Since: 18 Sep 2013
Location: Camberley, Surrey
Posts: 142
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Hi all - thanks for your replies so far - much appreciated!
Mr P - as you seem to have had the same issue, can I ask a couple of questions please:
1) You mention the wire that you traced. Was this responsible for the fault at all or was that just for info?
2) When you refer to the BCU, do you mean the Restraint Control Module (RCM) that is situated between the front seats below the centre console?
3) Did you just change this and nothing else to clear the codes and get dash light to extinguish?
4) Can you recall the part number - I've been quoted NNW512000 as a match for my VIN (£300+ now!)
5) Was it just a straightforward replacement - i.e. fit new and plug back in, no 'programming' required after fitting?
All and any insight gratefully received!
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| 17th Apr 2018 1:11 pm |
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parrafin23
Member Since: 04 Dec 2011
Location: Buskeud
Posts: 678
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1. The wire tracing was just for diagnostical purpose. You can ofc do the same. But this was not the issue
2. When I refered to BCU thats the BodyControl Module. The one with all the fuses located behind the lower glovebox. (Its a pig to get to )
3. I just changed the RCM (pre programed to my vin), did a global clear on faults on all modules. light went out.
4. Im sorry I cant recall the part number. I did search thru all my pm's and i cant find any record about getting the part number.
5. It was quite straight forward. Remove the vehicle battery. let its sit for 20mins.
undo some bolts that holds the rear of the center console, lift the console up a tad, remove the cup holders for 2.nd row seats. undo the connectors and remove 2 torx screws. Install the new module and monunt everything back.
Bonus reply :
You might be able to get it cheaper if you send it to Airbagman.co.uk or crashdata.co.uk etc for a repair. The fault code indicates an internal fault, it might be as simple as a capacitator that needs to be replaced that cost a few cents just for the part, Send em an Email and ask.. who know
Mr.P
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| 18th Apr 2018 1:34 pm |
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Crackers
Member Since: 18 Sep 2013
Location: Camberley, Surrey
Posts: 142
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Cheers Mr.P !
Very helpful and much appreciated.
You're a top man! 
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| 18th Apr 2018 1:44 pm |
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Crackers
Member Since: 18 Sep 2013
Location: Camberley, Surrey
Posts: 142
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Helpful online chat with CrashData chap.
He thinks a wiring fault most likely. To re-programme the module he'd expect to be working against code B1193 - Crash Event Storage - Full & Locked.
Not suggesting Mr P is wrong to say that RCM needs replacing, it could be faulty... I'll do a bit more work on trying to find the wire (SJ991) in the post Pete K referenced in an earlier reply and Mr P also traced... Just in case...
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| 18th Apr 2018 3:19 pm |
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Hairy47
Member Since: 13 Jul 2017
Location: Bradford
Posts: 277
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Crackers.... Did you resolve this issue?
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| 1st May 2018 6:23 pm |
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Crackers
Member Since: 18 Sep 2013
Location: Camberley, Surrey
Posts: 142
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She's booked in for a replacement RCU next week. Will update after that!
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| 1st May 2018 9:11 pm |
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Crackers
Member Since: 18 Sep 2013
Location: Camberley, Surrey
Posts: 142
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Update: I really hope that I'm not tempting fate but pleased to report that replacing the RCM appears to have fixed the problem. Airbag light is out and all fault codes cleared. Thanks to Challenger 4x4 for diligently checking wiring / connectors before going ahead with the module change. Wallet is somewhat lighter now though!
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| 10th May 2018 6:02 pm |
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