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GT4
Nordschleife
Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire
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 Posted: Mon Aug 09, 2010 4:08 pm Post subject: Bonnet Release DIY - for when the battery dies
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The Boxster, Cayman, 996 and 997 are all designed with a battery stored under the front bonnet.
This is great for weight distribution, not so great when the said battery dies and locks itself in.
There are 5 basic entry methods. Three electrical and two mechanical.
Early Boxster and 996 models have cable operated releases, activated by levers by the driver's seat. Later models and all Cayman and 997 have buttons by the driver's seat to operate the locks by electronic solenoid.
The early models have the levers locked out when the car is locked and the button versions are isolated when the car is locked.
If yours is a Button Model zip straight to the last entry of this post. On the way note the pain you have avoided by having a later model!
LEVER MODELS
You have four options with the mechanical lever models: access the cables internally or externally or energise the unlock relay circuits via engine bay or fuse box.
External Cable access (Designed by Porsche if keys, battery absent etc)
There are two external cable release "eyes" - one at each end of the car.
NOTE: Lever release cables are routed to the Passenger side (front and real) (RHD).
Electronic Release models also have these cables, but the front cable is routed to the Driver's side (RHD).
Front Release
Access this "eye" via removal of the wheel arch liner. Remove from the Passenger's side (Lever Model) (RHD).
The centre pin plastic rivets for the liner just prize out (pull up centre pin with long nosed pliers/screwdriver and they "shrink" to release).
Look a bit like this:
The problem with this method is that a previous "helpful" owner may have moved the cable to somewhere more accessible (which you don't know) or it has been dislodged by repair work.
Rear Release:
Inside the engine bay there is a +ve jump start and charging point. This can be accessed via the rear cable release. Simply slide in a plastic ruler or hook to fish out the cable lying under the Passenger's side (RHD) rear lamp cluster. You can energise the car via this terminal and an unpainted earth.
Internal Cable Access
It is only the levers that are locked out by the dead battery, so the aim of this method is to overide the locking plate or pull the release cable directly.
Locking Plate Overide
If you carefully "pick" the release locking plate down the gap between the levers with a long thin screwdriver you can release the cable locking mechanism. Now you can pull the lever.
Cable Pull
Carefully prize open the lever assembly structure (by drivers door) and unscrew the three M5 Allen bolts and you can manually pull the release cable with a pair of pliers or hook (it is the levers that are locked, the cable is free to move).
Unscrew the panel on the right of the driver that houses the bonnet release. They need loosening and the whole housing should lift out. Don't take the Allen bolts out all the way otherwise they are a real pain to get back in!
Once you have moved the housing a little (you don't need to remove it completely), you should be able to pull the bonnet. You should see the deadbolt behind the lever which is preventing the lever from moving. Once the bonnet is open a bit of charge should allow you to unlock with the remote and disable to deadlock.
The Allen bolts will be covered by some plastic caps. Just lever them off (there are 3 of them) and the allen bolts are beneath. Once you've loosened these the plastic plate will lift off enough to bypass the deadlock and the bonnet will open
Tedwedz Cable Pull
| Quote: | | Anyway solved the problem by pulling the cable from by the fuse box! You just yank the whole cable! Anyway pulling the cable by the drivers door floor works, between bonnet and floor handle |
Energise the locks with a "Fuse Buddy"
The Lever Models don't have a "Red Terminal", so make your own!
Connect both spades of a dummy fuse into position C3 with 12v positive and connect the negative to an exposed part of the body (ie not painted) - you should be able to use the door catch hoop on the rear of the door frame.
You can use a jump-pack or set of jump leads to another car battery for example. (connect the negative of the donor battery last in case of sparks etc)
Make one yourself using a spare fuse (solder on to both spades) - the lump of pig iron on the end is so your 12v crocs can actually hold it!
There is an OPC TSB (Porsche Technical Service Bulletin) if bonnets lock (and the techies cant be bothered to reach around for possibly displaced cables etc)
| Quote: | Front and Rear Hood Release Inoperative [grp5 1/96 5510 1/21/97] 1pg
Should the front and rear hood releases become inoperative due to a disconnected or discharged battery, the following procedure will allow the hoods to be operated electrically under these conditions.
Open the driver's door.
Using an external battery, connect the negative lead to the door stop.
Connect the positive lead to both sides of fuse "C3".
With the door open, move the door latch with a screwdriver into the closed position.
Using the key, lock and unlock the door.
The front and rear hood releases can now be operated.
Note: If the vehicle is in the workshop and the battery must be disconnected, try to park the vehicle in a safe area where it is not necessary to latch the front hood.
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The TSB also suggests fitting an inline 30 amp fuse (if you dont use a "buddy" with built in fuse carrier).
BUTTON MODELS
This is the easier solution (that's why Porsche evolved it!)
Just pull the red +ve terminal out of the fuse box and attach the positive of a 12v battery.
Connect the negative to an exposed part of the body (ie not painted) - you should be able to use the door catch hoop on the rear of the door frame.
You can use a jump-pack or set of jump leads to another car battery for example. (connect the negative of the donor battery last in case of sparks etc)
Now you have energised your car you can open the bonnet (or run anything else in theory).
With thanks to RichardH, TBrown, Tedwedz et al.
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Porsche
Donnington
Joined: 31 Dec 2002
Posts: 12734
Location: Nürburgring Nordschleife
2003 Porsche 996 GT3 Mk2
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| Posted: Mon Aug 09, 2010 6:26 pm Post subject:
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excellent info 
_________________
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964 Project Car
996 MK2 GT3 CS Manthey
993 Targa
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T8
General
Joined: 29 Jun 2010
Posts: 16122
Location: Kent
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| Posted: Sun Feb 12, 2012 1:45 pm Post subject:
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IMPORTANT NOTE FOR 996.2 OWNERS.
Don't pull the red plastic block out as far as I did!
Pulling it by hand should bring it out half way which is all you need to do. If you use pliers this might happen!
That pink wire was connected to the red connector block and needs to be for the process to work.
_________________
2007 Guards Red 997 Turbo Tiptronic
ex 2004 Polar Silver 996T Tiptronic
ex 2002 Seal Grey 996.2 C4 Tiptronic
ex 1978 Silver 924 Manual
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GT4
Nordschleife
Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire
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| Posted: Sun Feb 12, 2012 2:05 pm Post subject:
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... or any (late) 996.1 with button (not lever) releases.
All button release get the red terminal.
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eboy1978
Newbie
Joined: 15 Feb 2012
Posts: 5
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| Posted: Wed Feb 15, 2012 10:59 am Post subject:
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Hi,
Great info, thank you for this. I have a battery charger and a 2004 996 (button release), can I use this to get enough power to pop the bonnet open?
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GT4
Nordschleife
Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire
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| Posted: Wed Feb 15, 2012 1:43 pm Post subject:
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Possibly, depends on the current provided.
Do you not have a spare 12v battery (in a car or on its own) and jump leads?
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Waz
Estoril
Joined: 14 May 2011
Posts: 3504
Location: Sutton coldfield
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| Posted: Wed Feb 15, 2012 6:34 pm Post subject:
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Is it possible to charge the battery through the fag lighter 
_________________
May the Forsche be with you
2004 3.6 996 C4S cab in The fast black
Cayenne turbo S in matching black 600bhp
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Kgboxers
Montreal
Joined: 13 Feb 2011
Posts: 531
Location: Hampshire
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| Posted: Wed Feb 15, 2012 8:43 pm Post subject:
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Great write up chaps
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GT4
Nordschleife
Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire
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| Posted: Wed Feb 15, 2012 10:22 pm Post subject:
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| Waz 911 wrote: | | Is it possible to charge the battery through the fag lighter |
Short answer: yes.
Longer answer: 996.2 - yes, 996.1 - only if the cigar lighter socket is rewired permanent live (default is ignition live).
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chriggy
Trainee
Joined: 23 Feb 2010
Posts: 70
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| Posted: Tue May 08, 2012 1:53 pm Post subject:
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Thanks again to GT4 for helping out with this - FWIW i spent a lot of time messing about with a fusebuddy that was for some reason unsuccessful, the easiest option on my 996.1 was to prise open the carpet next to the fuse box (just wedged a screwdriver in between the rubber seal and carpet, it took a couple of good yanks on the cable).
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GT4
Nordschleife
Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire
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| Posted: Tue May 08, 2012 2:45 pm Post subject:
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Tedwedz strikes again! 
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GT4
Nordschleife
Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire
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| Posted: Fri Jun 08, 2012 12:13 pm Post subject:
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Apologies to those with newly impaired hearing, forgot to add the advice for disconnecting batteries (which applies here too):
| Quote: | To change the battery:
Put the key in the ignition and turn to "1".
That way you won't be deafened by the alarm module (cunningly placed by the battery, under the front bonnet which is also perfectly designed to channel all that siren goodness to your ear drums).
Disconnect negative first.
Swap batteries
Reconnect negative last.
Don't forget to reconnect the acid vapour overflow pipe. |
The important bit here is the key in ignition "1".
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S2000
Newbie
Joined: 08 Dec 2011
Posts: 12
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| Posted: Sat Mar 02, 2013 10:33 am Post subject:
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Hello
I followed the method of the positive in the fuse box and the door striker, unfortunately the horn sounded but neither hood or engine lid switches activated to open. The fron t cable pull broke when I tried to open it!
Before I sell the car as an anchor any other ideas on how to open either lid?
Alisdair
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T8
General
Joined: 29 Jun 2010
Posts: 16122
Location: Kent
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| Posted: Sat Mar 02, 2013 11:01 am Post subject:
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| S2000 wrote: | Hello
I followed the method of the positive in the fuse box and the door striker, unfortunately the horn sounded but neither hood or engine lid switches activated to open. The fron t cable pull broke when I tried to open it!
Before I sell the car as an anchor any other ideas on how to open either lid?
Alisdair |
The driver's manual states:
1. Use the key to unlock the vehicle at the door lock. Leave the key in the door lock.
It later says;
Note. If the vehicle was locked, the alarm horn will sound when the neagtive cable is connected.
When you unlocked the car did you leave the key in the door lock
_________________
2007 Guards Red 997 Turbo Tiptronic
ex 2004 Polar Silver 996T Tiptronic
ex 2002 Seal Grey 996.2 C4 Tiptronic
ex 1978 Silver 924 Manual
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S2000
Newbie
Joined: 08 Dec 2011
Posts: 12
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| Posted: Sat Mar 02, 2013 11:21 am Post subject:
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Thanks for your reply, I left the key in the door after unllockig, but none of the release buttons would work.
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GT4
Nordschleife
Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire
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| Posted: Sat Mar 02, 2013 11:41 am Post subject:
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| S2000 wrote: | | Thanks for your reply, I left the key in the door after unllockig, but none of the release buttons would work. |
On power-up, did you cycle the central locking (lock/unlock)?
If the car thinks it is still locked, then the buttons are inoperable.
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HoocH
Trainee
Joined: 14 Nov 2011
Posts: 56
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| Posted: Wed Mar 20, 2013 8:51 pm Post subject:
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got myself a trickle charger. Great bit of kit!......Apart from when you dont turn the socket on!!!
Im now trying to jump from another car but as i connect the -/neg it sparks then I hear a relay click and nothing happens. No lights, no bonnet open, no horn nothing....
Any ideas?
Thanks
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GT4
Nordschleife
Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire
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| Posted: Wed Mar 20, 2013 11:02 pm Post subject:
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Where are trying to jump to/from?
996 can only be jumped from the engine bay (see your manual)
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HoocH
Trainee
Joined: 14 Nov 2011
Posts: 56
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| Posted: Thu Mar 21, 2013 6:23 am Post subject:
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Im connectiing to the red connector in the drivers footwell. I only want to open the bonnet. But no luck!?
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Ant Blain
Kyalami
Joined: 11 Mar 2010
Posts: 1754
Location: Manchester
2003 Porsche 996 Carrera 2
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| Posted: Thu Mar 21, 2013 8:01 am Post subject:
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| GT4 wrote: | Where are trying to jump to/from?
996 can only be jumped from the engine bay (see your manual) |
Do you mean a 996 should only be jumped from the engine bay? Because I've jump-started mine direct to the battery in the past; worked fine and doesn't seem to have done it any harm...? 
_________________
_/_/_/ ex-2003 911 Carrera _/_/_/
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