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chriscoates81
Suzuka


Joined: 17 May 2013
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PostPosted: Fri Mar 09, 2018 6:05 pm    Post subject: Wierd electrical/central locking issue Reply with quote

So today at lunch I noticed my car wouldn't lock with the fob, using the key works and so does the switch on the dash. I also noticed the voltmeter showing around 13.5v rather than the usual just under 14v. Any ideas, I changed the regulator on the drivers window a couple of weeks ago but I don't think it's related.

Cheers guys.
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chriscoates81
Suzuka


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PostPosted: Fri Mar 09, 2018 7:54 pm    Post subject: Reply with quote

interestingly the fob no longer opens the bonnet either. Does this mean its 100% the fob?
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MisterCorn
Long Beach


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Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Fri Mar 09, 2018 8:02 pm    Post subject: Reply with quote

I would check the fob battery.

MC
 
  
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chriscoates81
Suzuka


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PostPosted: Fri Mar 09, 2018 8:14 pm    Post subject: Reply with quote

I should of half inched a battery from work earlier lol.
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deMort
Zolder


Joined: 21 Mar 2015
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Location: Brighton


PostPosted: Fri Mar 09, 2018 8:15 pm    Post subject: Reply with quote

When you press the fob does the red light flash ?

If not then battery or new fob required .

If it does then it still can be the fob but also the ignition lock or the drivers door lock asembly .

With a tester you can see fob activation plus the ignition lock fault (if you know what to look for ) and if the door lock drivers side is faulty .
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chriscoates81
Suzuka


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PostPosted: Fri Mar 09, 2018 8:41 pm    Post subject: Reply with quote

The light does flash, im going to visit an indi tomorrow and see what he says. Why would the ignition or door lock affect the central locking?
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deMort
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PostPosted: Fri Mar 09, 2018 8:58 pm    Post subject: Reply with quote

If the car thinks the key is still in the igntion it wont lock ( yes with the central locking button but not the fob ) .. there is a switch in the ignition lock that can fail and cause this .

If the car thinks the drivers door is open it wont lock .. micro switch failure .

No light on the fob = battery or fob .
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chriscoates81
Suzuka


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PostPosted: Fri Mar 09, 2018 9:26 pm    Post subject: Reply with quote

Hmm I did have an issue where the engine wouldn't turn over at all. I wonder if the barrel is knackered.
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chriscoates81
Suzuka


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PostPosted: Sat Mar 10, 2018 11:16 am    Post subject: Reply with quote

So I'm I change the fob battery and neither the bonnet pops or the car locks, I'm assuming either the fobs broken (despite light on fob flashing) or it's somehow become induced to the car?
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chriscoates81
Suzuka


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PostPosted: Sat Mar 10, 2018 12:32 pm    Post subject: Reply with quote

Just tried it, still no luck and to top it off as soon as I open the car with the kettle alarm goes off. Weirdly I can still lock the car by pressing the fob button when it's in the ignition. Should I order a new fob?
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deMort
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PostPosted: Sat Mar 10, 2018 5:19 pm    Post subject: Reply with quote

Try fitting the fob battery upside down , then refit it the correct way .

There are other ways to try and reset the fob but i cant find the list Sad

I would suggest get your indy to look at it first rather than just replaceing the fob as i find it strange it works when in the ignition lock as that takes us back to the ignition lock fault where it doesnt see the key being removed from the ignition .
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chriscoates81
Suzuka


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PostPosted: Sat Mar 10, 2018 6:40 pm    Post subject: Reply with quote

I'm visiting an Indy on Mon night after work to see if he can resend it (I've tried battery upside down, key in ignition and pressing button) also my alarm goes off straight away rather than give me 10 secs which is quite annoying.
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chriscoates81
Suzuka


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PostPosted: Mon Mar 12, 2018 6:04 pm    Post subject: Reply with quote

So after a visit to my Indy, there were no error codes but he thinks it's the sensor on the dash 99665325100. Anyone have any experience changing it, it looks as though it just pops out.
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deMort
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PostPosted: Mon Mar 12, 2018 7:59 pm    Post subject: Reply with quote

No fault codes and he thinks its this .. Pop Corn

yes it just pops out .

Btw .. thats the sun sensor and the alarm indicator light .
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chriscoates81
Suzuka


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PostPosted: Mon Mar 12, 2018 8:25 pm    Post subject: Reply with quote

There were some codes but I can't remember them. My issue is to take to Porsche is a sat job as I can't get there before they shut on a weekday. Do you think he's barking up th^ wrong tree, design 911 lists it as a sensor with no mention of it being related to sun. He's thinking its that due to the bonnet not popping up with the fob either.
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deMort
Zolder


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PostPosted: Mon Mar 12, 2018 9:01 pm    Post subject: Reply with quote

its difficult for me to say .. i cant see the car so am working on what you have posted .

Info ..

The car wont lock ..

So .. its either not seeing the signal to lock or its seeing something critical that it wont lock because of that.

No signal .. can be seen on a tester .. fob signal in alarm actual values .

Fob faulty or alarm not seeing the signal so antenna lead or faulty alarm control unit .

Critical items ..

If it thinks the key is in the ignition it wont lock .

If it thinks the drivers door is open it wont lock .

It will lock for pretty much every situation other than that but will beep if it sees a fault .

That sensor is pretty much just an led .. i guess it could cause this .. all i can say is i wouldn,t expect it to do this and ive never seen it before .

I have seen the faults ive listed though .

Drivers door lock can be seen on a tester .

Ignition key being seen as still in the lock can be seen on a tester.

Fob signal .. which will rule out the antenna lead and the fob .. can be seen on a tester .

As with all things we eliminate each posibility then move onto the next .

When we have proved all external parts are ok we replace the control unit as thats all thats left and its almost impossible to prove a control unit / software fault.

We eliminate things .


EDIT ..

The codes would help if you can get them .
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chriscoates81
Suzuka


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PostPosted: Mon Mar 12, 2018 10:04 pm    Post subject: Reply with quote

OK, he cleared them however I might nip in on Sat morning. Just to note, the car locks with the key OK but 75% of the time the alarm goes off straight away when unlocking. I think if I can test that my fob is actually sending out a signal that will help. I'm thinking as the fob doesn't pop the bonnet it's got to be either the fob or the reciever in the car, any idea where it's located. I would guess that if either isn't working the car probably won't throw a code as it won't know they're not working or am I being daft?
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deMort
Zolder


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PostPosted: Tue Mar 13, 2018 7:43 pm    Post subject: Reply with quote

The key and the fob are seperate systems .. the key mechanically moves the drivers lock mechanism and that sends out the lock or unlock signal.

The fob sends a frequency direct to the alarm control unit (433 mhz in this country ) .

The antenna lead plugs direct into the alarm cu which is under the passenger seat (black wire with a brass connection ) .

You should have 10 seconds before the alarm tiggers so that in its self is a fault .. might be the cu is " upset " .. its been locked with a fob but now is being unlocked with a key many times .. or it might be seeing something it thinks is a theft attempt .

You wont get a code for a fob fault .. there isnt one .. it either gets the signal or doesnt.

90 % of the time its a fob fault but ive listed other things that can cause it and i have seen over the years .

Check under the passenger seat for water / drinks bottles as thats another possibility ... CU,s dont like water .

With out looking at the car im kinda stuck on what else to tell you im afraid Sad
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chriscoates81
Suzuka


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PostPosted: Tue Mar 13, 2018 8:10 pm    Post subject: Reply with quote

I did read a website saying that putting a sensitive piece of electronics in the lowest part of the car was a bit of a stupid move. I'm going to a locksmiths on Sat afternoon as they can then test my fob and car. My gut feeling is that you're right, the fob dead. It's possible it's the original fob so could be 15 years old which means its had a fair bit of hammer. Unfortunately I live near near so nearest opc is an hour a a quarter away so it's a weekend trip only.
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deMort
Zolder


Joined: 21 Mar 2015
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Location: Brighton


PostPosted: Tue Mar 13, 2018 8:16 pm    Post subject: Reply with quote

They can test the fob is sending a signal .. but its coded ..

Well .. its a rolling code so the fob and the alarm cu keep altering the code .. not sure if they can test its the correct code .. love to know if they can though .

Trouble is .. just throwing a fob at the car is kinda expensive .. hence i would have prefered a tester to see if its recieveing the signal .

But yes .. the fob is the most obvious .. if not that then it will require a " bit " of investigation .

EDIT ..

Porsche still fit CU,s to the floor pan even on the 991 .. ive seen them flooded out before .

water always gets in the passenger side and rarely the drivers side .. RHD have the cu,s under the passenger side .. sigh .
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