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Thread: Airbag/SRS Pretensioner fault

  1. #1
    Join Date
    Feb 2019
    Location
    Brisbane
    Posts
    18

    Airbag/SRS Pretensioner fault

    Hi All,

    New member/owner here, thrown in the depth of Range Rover troubleshooting. I wanted a challenge...someday I may regret!

    I've posted this on the L322 owners FB group also, but looking for advice on resolving this fault.

    RCM-Airbag

    B0072-13 (AA) Passenger's safety belt pretensioner deployment control - General electrical failure - circuit open

    My airbag light is on, occasionally has gone off for some trips. Have new battery. So far I have unbolted the passenger seat and checked the pretensioner for continuity, so I think the pretensioner itself is ok. Reseated a number of the harness plug connectors. Wiring upon initial inspection seems ok, no chafing/pinches that I can see. Upon resetting the module, the fault instantly returns so I need to do further investigation.
    Any tips on where to keep digging? Thinking I need to get a wiring diagram to start checking the right part of the harness for any breaks.

    MY08 L322 RR Vogue

  2. #2
    Join Date
    Mar 2007
    Location
    Canberra
    Posts
    584
    Hi Mick
    Don't laugh, but check your battery first !!! A poor battery can create many fault warnings in these cars.

    Laurie

    .

  3. #3
    Join Date
    Feb 2019
    Location
    Brisbane
    Posts
    18
    Thanks Laurie. No laughing here at all. When I got the car it had a knackered battery already. So I've seen how some things behave with low voltage. Key wouldn't turn in ignition etc..despite everything else appearing to power up ok.

    I have within the last month just installed a new battery. Amaron DIN100 which has a three year warranty. Interestingly when I picked it up, the testing voltage seems to be a little lower than expected at 12.51 volts. So when connected to the car and all the gizmos wake up, the load brings the voltage down to about 12.3, until things go to sleep again.

    This morning I thought I'd take your advice and check the voltage again after car woken up (to open bonnet) and gone back to sleep and the voltage at the battery is 12.42. Quite low in my opinion for a new battery.
    Wondering whether I have picked up a dud *new* battery, or if there is a drain in one of the circuits.
    IMG_20190905_073911.jpg

  4. #4
    Join Date
    Feb 2019
    Location
    Brisbane
    Posts
    18
    Just checked while running, voltage is 14.66v.
    It has had a new alternator fitted by previous owner.

  5. #5
    Join Date
    Mar 2007
    Location
    Canberra
    Posts
    584
    Mick
    I think the voltage of 12.42v for a new battery is low ! I would expect a reading of 12.50v+ from an older battery ! Your charging voltage is great. I would get the battery load tested and take it from there. On my previous Rangie I had a intermittent battery drain problem; after many months it turned out to be the wiper relay Easy fix, but locating ???

    Laurie

  6. #6
    Join Date
    Feb 2019
    Location
    Brisbane
    Posts
    18
    Yes, I think the jury is out on the battery. I might drop past another more local battery shop to get their opinion on the battery. I have the load test for the battery when I picked it up from the other store, it passed with flying colours, just the lower voltage which I thought might have been from it sitting on the shelf a little an slightly discharged.

    There could also be a drain issue, yet to be determined.

    So last night I made up a dummy airbag tester to replace the pretensioner and check the wiring. Computer was still bringing up an open circuit fault.
    (1) I reseated the two plugs under the seat again which are part of the pretensioner/seat belt circuit.
    (2) I noticed that where the loom leaves the under seat area toward the centre console it wasn't passing through a hole in the carpet where it would make sense to route the wiring. So I manipulated the harness into what looks to be the correct position. This is where two sections of carpet meet, they now can sit more flush.
    At this stage I rechecked the status of the SRS system, still coming up with a fault immediately.
    (3) Pulled centre console apart to the point of seeing everything under the E brake and shifter assembly, still couldn't see the SRS ecu and not prepared to dig further as was getting late.
    So cleaned up some of the panels, managed to fix the rear aux door (was stuck open) and put it all back together.

    So after all that I've started the car again and it's decided the SRS system is all good! So I'm not convinced I've fixed it, other than identify there must be a dicey connection which I have disturbed.

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