1998 Boxster alarm replace - Rennlist - Porsche Discussion Forums

Notices

1998 Boxster alarm replace

Old 06-14-2018, 11:55 PM
  #1  
ddodgen
User
Thread Starter
 
Join Date: Jun 2018
Location: Chesterfield, va
Posts: 56
Default 1998 Boxster alarm replace

has anyone had any luck in replacing the stock alarm and door opener system with an after market system? don't know if my problem is key guts or alarm system but it would cost over $200 to get and program new fob and a complete aftermarket is about $300. Your help would be appreciated.
ddodgen is offline  
Old 06-16-2018, 05:53 AM
  #2  
Geof3
Addict
Rennlist Member
 
Join Date: Dec 2016
Posts: 78
Default

Can’t be done. The immobilizer and ECU talk to each other, both must work and be installed along with the chip in the key fob to make everything do their thing. Pull your front seat, you immobilizer is under it. You may have water damage, which causes weird systems issues at best, kills the car at worst (until fixed or replaced)
Geof3 is offline  
Old 06-16-2018, 10:34 AM
  #3  
ddodgen
User
Thread Starter
 
Join Date: Jun 2018
Location: Chesterfield, va
Posts: 56
Default

Originally Posted by Geof3 View Post
Canít be done. The immobilizer and ECU talk to each other, both must work and be installed along with the chip in the key fob to make everything do their thing. Pull your front seat, you immobilizer is under it. You may have water damage, which causes weird systems issues at best, kills the car at worst (until fixed or replaced)
sorry to hear that. Car runs fine right now with no problems and I cannot find anything to indicate wet under the seat so will be manually unlocking doors. Cannot afford to spend close to $300 just to "try" and see with new fob
ddodgen is offline  
Old 06-16-2018, 11:50 AM
  #4  
Macster
Addict
Rennlist Member
 
Join Date: Sep 2006
Location: Livermore, CA
Posts: 17,622
Default

Originally Posted by ddodgen View Post
sorry to hear that. Car runs fine right now with no problems and I cannot find anything to indicate wet under the seat so will be manually unlocking doors. Cannot afford to spend close to $300 just to "try" and see with new fob
Just because the key fob button no longer unlocks/locks the doors is no reason to replace the car's security system.

Absent any signs of water intrusion -- keep those body water drains free of trash! -- the key/s can be at fault.

The circuit board in the key can go bad. The battery that powers the circuitry of the key can die. Or the circuitry of the key can act up. If one of these is going on a clue is when the door lock/unlock button is pressed the LED in the key fob does *not* flash/blink.

In this case what can resurrect a key is to gently pry apart the key fob case halves and remove the coin battery and flip it around and install it momentarily. This reversing of the polarity of the battery resets the circuitry and in my experience a couple of times over the years has revived a key that previously was unable to unlock/lock the doors.

There is even a less severe case of the key circuitry getting in a goofy state that can be "fixed" by inserting the key in door lock and turning the key to the left (or right I forget which direction now) two times in rapid succession. This resync's the key and its electronics with the car's security system. When I do this is when the key fails to unlock the doors but the LED of the key fob flashes which indicates the key circuitry is at some level working.
Macster is offline  
Old 06-16-2018, 01:57 PM
  #5  
Geof3
Addict
Rennlist Member
 
Join Date: Dec 2016
Posts: 78
Default

Also see if your door locks are working properly, you can insert the key, turn and hold, (don’t remember which direction) and it should open/close the windows. Does your alarm system chirp at all when trying to activate? It shouldn’t and can clue you in to some issues. Might be worthwhile to pull the immobilizer, remove the cover, and look at the board. It’s not too difficult a process overall. Or, you could take it to a dealer and have the entire thing diagnosed but that =$. I’m not sure if the standard Durametric cable lets you see problems with the security system, but the pro does. It is worthwhile IMO to get the box out and check to be sure. If it has had water damage it is a potential time bomb to leave you stranded somewhere. Usually though if the board is a problem you would have other odd issues with the electronics.

Macster, cool tip on the key reset!
Geof3 is offline  
Old 06-16-2018, 02:00 PM
  #6  
ddodgen
User
Thread Starter
 
Join Date: Jun 2018
Location: Chesterfield, va
Posts: 56
Default

Originally Posted by Macster View Post
Just because the key fob button no longer unlocks/locks the doors is no reason to replace the car's security system.

Absent any signs of water intrusion -- keep those body water drains free of trash! -- the key/s can be at fault.

The circuit board in the key can go bad. The battery that powers the circuitry of the key can die. Or the circuitry of the key can act up. If one of these is going on a clue is when the door lock/unlock button is pressed the LED in the key fob does *not* flash/blink.

In this case what can resurrect a key is to gently pry apart the key fob case halves and remove the coin battery and flip it around and install it momentarily. This reversing of the polarity of the battery resets the circuitry and in my experience a couple of times over the years has revived a key that previously was unable to unlock/lock the doors.

There is even a less severe case of the key circuitry getting in a goofy state that can be "fixed" by inserting the key in door lock and turning the key to the left (or right I forget which direction now) two times in rapid succession. This resync's the key and its electronics with the car's security system. When I do this is when the key fails to unlock the doors but the LED of the key fob flashes which indicates the key circuitry is at some level working.
appreciate your help. Key flashed before but not now and I tried the reset using the door lock. Im lost.
ddodgen is offline  
Old 06-16-2018, 02:04 PM
  #7  
ddodgen
User
Thread Starter
 
Join Date: Jun 2018
Location: Chesterfield, va
Posts: 56
Default

Originally Posted by Geof3 View Post
Also see if your door locks are working properly, you can insert the key, turn and hold, (donít remember which direction) and it should open/close the windows. Does your alarm system chirp at all when trying to activate? It shouldnít and can clue you in to some issues. Might be worthwhile to pull the immobilizer, remove the cover, and look at the board. Itís not too difficult a process overall. Or, you could take it to a dealer and have the entire thing diagnosed but that =$. Iím not sure if the standard Durametric cable lets you see problems with the security system, but the pro does. It is worthwhile IMO to get the box out and check to be sure. If it has had water damage it is a potential time bomb to leave you stranded somewhere. Usually though if the board is a problem you would have other odd issues with the electronics.

Macster, cool tip on the key reset!
Thanks. Tried the key and windows go up and down. No chirp no sound whatsoever. I will put the seat tomorrow and see what I can see. No other issues with electrics or electronics
ddodgen is offline  
Old 06-16-2018, 02:32 PM
  #8  
Geof3
Addict
Rennlist Member
 
Join Date: Dec 2016
Posts: 78
Default

Given all of that, it is probably the key circuit board as Macster mentioned. You would have other funkiness if it were the immobilizer. Does your key open the frunk or trunk? I'm not sure if the early keys had that feature. Take the cover off and manually press the little button, the rubber can get funky in the fob itself. You can get replacement fobs on Pelican if you get lucky and that is the problem, I had to replace mine and my fob worked perfectly after that. Could also just be a bad connection in the little board, check the solder joints...
Geof3 is offline  
Old 06-16-2018, 04:10 PM
  #9  
ddodgen
User
Thread Starter
 
Join Date: Jun 2018
Location: Chesterfield, va
Posts: 56
Default

Originally Posted by Geof3 View Post
Given all of that, it is probably the key circuit board as Macster mentioned. You would have other funkiness if it were the immobilizer. Does your key open the frunk or trunk? I'm not sure if the early keys had that feature. Take the cover off and manually press the little button, the rubber can get funky in the fob itself. You can get replacement fobs on Pelican if you get lucky and that is the problem, I had to replace mine and my fob worked perfectly after that. Could also just be a bad connection in the little board, check the solder joints...
I think I will gamble and order the fob from Pelican. When you did yours did you reset the new fob by turning key in lock twice or how?
ddodgen is offline  
Old 06-16-2018, 04:16 PM
  #10  
ddodgen
User
Thread Starter
 
Join Date: Jun 2018
Location: Chesterfield, va
Posts: 56
Default

Originally Posted by ddodgen View Post
I think I will gamble and order the fob from Pelican. When you did yours did you reset the new fob by turning key in lock twice or how?
Geoff, went looking in Pelican but could not find the key fob. Any suggestions?
ddodgen is offline  
Old 06-16-2018, 06:58 PM
  #11  
Geof3
Addict
Rennlist Member
 
Join Date: Dec 2016
Posts: 78
Default

Here is the link, but yours may be different:

https://www.pelicanparts.com/cgi-bin...iption=986+key

My issue was only the outer plastic portion, the rubber buttons were shot, my internals were fine. That’s why it would be good to open up the fob, try the buttons with your fingers and see if it works. If so, all you need is the plastic cover. You have tried a new battery haven’t you? If you have, try another one, I’ve had more than one be dead out of the package.

You can find replacement outer’s on eBay as well, just swap your internals. Regarding the new board reset, the transponder chip is what your car needs to start, it is a little green pill in the fob. It is glass, if you break that, it is tow the car to the dealer time and have a completely new key made $$$$. The car will not start without that little green pill. I’m not sure how to program the board to the car, check your owners manual, there may be a procedure in there, or perhaps someone else may have done it.
Geof3 is offline  
Old 06-16-2018, 07:27 PM
  #12  
ddodgen
User
Thread Starter
 
Join Date: Jun 2018
Location: Chesterfield, va
Posts: 56
Default

Originally Posted by Geof3 View Post
Here is the link, but yours may be different:

https://www.pelicanparts.com/cgi-bin...iption=986+key

My issue was only the outer plastic portion, the rubber buttons were shot, my internals were fine. Thatís why it would be good to open up the fob, try the buttons with your fingers and see if it works. If so, all you need is the plastic cover. You have tried a new battery havenít you? If you have, try another one, Iíve had more than one be dead out of the package.

You can find replacement outerís on eBay as well, just swap your internals. Regarding the new board reset, the transponder chip is what your car needs to start, it is a little green pill in the fob. It is glass, if you break that, it is tow the car to the dealer time and have a completely new key made $$$$. The car will not start without that little green pill. Iím not sure how to program the board to the car, check your owners manual, there may be a procedure in there, or perhaps someone else may have done it.
I misunderstood. the outer plastic is fine. I am thinking tht the guts are the problem and I really don't want to spend $175-$200 for it. I think I will just leave it alone and manually unlock/lock the car. Thanks
ddodgen is offline  
Old 07-18-2018, 06:17 PM
  #13  
smuko
User
 
Join Date: Jul 2018
Posts: 29
Default

Hello ,I can help with your key fob ,If you have problem I can learn again your key fob which doesn't work with another PAS unit,I need only PAS unit and key . You haven't buy new remote control ,I do this gratis (no pay ,because many people have the same problem but nobody here on this forum believe me ,I want only presenet my know-how)
Best regards
smuko is offline  
Old 12-02-2018, 08:37 PM
  #14  
ddodgen
User
Thread Starter
 
Join Date: Jun 2018
Location: Chesterfield, va
Posts: 56
Default

After several months of looking, I am still lost. My key operates the door manually fine. If I lock the doors manually the led on the dash indicates alarm on and if if open the hood or doors while it is locked the alarm will sound. Battery in remote was replaced and the little light on the fob will still not light or work no matter what I do. looked carefully at circuitry and cannot see cracks or anything wrong.. It appears that the electronics in the fob are dead. Where can I get new electronics for my 2 button? I realize that I will probably have to go the Porsche to reprogram but would like to fix.
ddodgen is offline  
Old 12-02-2018, 08:44 PM
  #15  
Anker
User
 
Join Date: Nov 2016
Posts: 144
Default

If the light doesn't come on when you press the buttons your switches under the buttons may be toast. If you are handy with a soldering iron you can fix that yourself. The switches are available on eBay (to buy them elsewhere you have to buy them in lots of a 1000). If you take the circuit board out with the battery in it and press the buttons with a nail or a pen you may get them to light up. Another way to test the switches is to take a piece of single strand wire and short the two sides of the switches. If you see the light blinking you have confirmation that the switches are bad.
Anker is offline  

Thread Tools
Search this Thread
Quick Reply: 1998 Boxster alarm replace


Contact Us About Us Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: