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Trevor
Member Since: 09 Aug 2007
Location: Hampshire
Posts: 155
  
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| Serious Question on Deployment of front Airbags |
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The question for the technos is this.
If the front airbags deploy say if you plough into a sand dune in the middle of the Sahara does this immobilise the vehicle or can the vehicle still be driven?
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 28th Sep 2009 2:46 pm |
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AndrewS
Tarquin of the Desert
Member Since: 06 May 2005
Location: Y...... because I can
Posts: 10438
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In theory yes. However I have  a D3 into sand dunes and the bags didn't go off.
Check this video out at 12.35 minutes in. We used the 110 to roll the sand flat as the previous competitor really messed up the sand on the climb. This worked most times on other sections and the D3 would climb on the compacted sand. However in this instance the front dug inn and killed momentum. Knowing what I know now I would have attempted it a bit slower or not bothered and gone straight for the wall of death method.
Anyway as you can see the car hits quite hard with no ill effects.
http://video.google.co.uk/videoplay?docid=-4418882666497007073# In the Beginning there was nothing, which exploded.
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| 28th Sep 2009 3:05 pm |
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DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
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If you do enter 'crash mode' it can be cancelled after the event by cycling the ignition switch. All should be drivable provided of course that the impact hasn't damaged any rolling components. 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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| 28th Sep 2009 4:25 pm |
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Trevor
Member Since: 09 Aug 2007
Location: Hampshire
Posts: 155
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Thanks for that DG at least would not need a tow back to Spain.
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| 28th Sep 2009 4:36 pm |
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NoDo$h
Member Since: 02 May 2006
Location: Finding new and exciting ways to milk badgers.
Posts: 19689
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That's the spirit Trevor, keep looking on the bright side 
Now, don't forget your paperwork this time.....  I know it's not considered "kind" to say no these days, but no. Just no, ok? And if it's not ok, still no.
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| 28th Sep 2009 7:43 pm |
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AndrewS
Tarquin of the Desert
Member Since: 06 May 2005
Location: Y...... because I can
Posts: 10438
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So Trevor are you going hardcore this time  In the Beginning there was nothing, which exploded.
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| 28th Sep 2009 8:00 pm |
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SteveNorman
Member Since: 14 Oct 2005
Location: Somerset
Posts: 1144
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Crash Signal
When the restraints control module outputs any of the
fire signals, it also outputs a hard wired crash signal to
the Engine Control Module (ECM) and changes the
high speed CAN bus output message from 'no crash' to
'crash condition'. The high speed CAN bus message is
used by the Central Junction Box (CJB) and the Fuel
Fired Booster Heater (FFBH).
On receipt of the crash signals:
• The ECM disables the fuel pump.
• Operation of the FFBH is disabled.
• The CJB enters the crash mode and:
• Activates all of the unlock signals of the vehicle
locking system, even if the vehicle is already
unlocked. After 3 seconds, the CJB activates the
unlock signals again, in case a lock button is
pressed during the crash, by flailing limbs for
example.
• Ignores all locking and superlocking inputs until
the crash mode is cancelled, when it returns the
locking system to normal operation.
• Activates all of the courtesy lamps, except for the
approach lamps. The activated courtesy lamps
remain on until they are manually switched off
at the lamp unit, or the CJB crash mode is
cancelled, when they return to normal operation.
• Activates the hazard warning lamps. The hazard
warning lamps remain on until cancelled by
turning the ignition switch from position II to
position I or 0, or until the crash mode is
cancelled.
The crash mode is cancelled by cycling the ignition
switch.
BUT:
The battery terminal posts allow for the battery cables to be connected with clamp type connections. The battery positive terminal uses a pyrotechnic attachment, which detaches the battery cable in the event of a crash of a severity to trigger the airbags. For additional information, refer to Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) (501-20B Supplemental Restraint System)
Can't find any additional information about this, but battery disconnection may a problem to driving 
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| 29th Sep 2009 2:48 pm |
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DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
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Unless you just reconnect it  21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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| 29th Sep 2009 2:51 pm |
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Gareth
Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26702
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I suppose the phrase " You were only supposed to blow the bloody cable off" comes to mind, as you survey the fragments of battery embedded in the underside of the bonnet 
Coat on , walking 
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| 29th Sep 2009 2:57 pm |
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10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
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SteveNorman wrote: battery terminal posts allow for the battery cables to be connected with clamp type connections. The battery positive terminal uses a pyrotechnic attachment, which detaches the battery cable in the event of a crash of a severity to trigger the airbags. For additional information, refer to Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) (501-20B Supplemental Restraint System)
Can't find any additional information about this, but battery disconnection may a problem to driving
That was only ever fitted on TD6 Range Rovers, it was originally supposed to be ported across to the T5 platform but never made it... (thankfully!) the black box on the +ve battery post is a 500A fusible link, not a pyro device
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| 29th Sep 2009 3:10 pm |
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