XJ XJ6 / XJR6 ( X300 ) 1995-1997

alarm system help..please??

  #1  
Old 09-06-2014, 06:27 AM
flying scotsman's Avatar
Member
Thread Starter
Join Date: Sep 2014
Location: sunderland
Posts: 30
Received 3 Likes on 3 Posts
Default alarm system help..please??

Hello all. Just bought a 95 sovereign and though it drjves like is bit rough round the edges.
This may seem strange question.
, but is it possible to disable the security system?
I have only 1 key, and a fob that doesnt work.
I feel for our family use, a new key and no fobs is going to be easier for us.
Can i simply unplug it?
 
  #2  
Old 09-06-2014, 08:25 AM
aholbro1's Avatar
Veteran Member
Join Date: Aug 2010
Location: Decatur, TX
Posts: 4,612
Received 1,638 Likes on 1,066 Posts
Default

Welcome to the forum, Scotsman. Please drop by the new members section and make an introductory post so you can enjoy the full benefits of this fabulous forum.


Meanwhile, you may find that your FOB need only be programmed to the car. Give it a fresh battery and refer to the owner's manual for the procedure (Available here in the "Stickies" if you don't have the paper copy)


On the other hand, I'm not sure I understand your question. If you obtain a proper second key, the security system should pose no problem. Inserting a valid key in the driver's door to unlock it will prevent the sound and light show, and should start the car.


Others may happen along with a better grasp of your question and how to answer it. I'm thinking while perhaps possible, it would be more trouble/expense than it is worth.
 
  #3  
Old 09-07-2014, 06:06 AM
flying scotsman's Avatar
Member
Thread Starter
Join Date: Sep 2014
Location: sunderland
Posts: 30
Received 3 Likes on 3 Posts
Default

Hi, thanks for the reply.
Problem i have is my current doesnt work. Changed battery with no luck.
I just thought it would be easier to just disconnect the system and open and close with a key?
Do the keys have transponder chips in them?
 
  #4  
Old 09-08-2014, 06:44 AM
V126man's Avatar
Senior Member
Join Date: Jun 2012
Location: Ireland
Posts: 126
Received 72 Likes on 43 Posts
Default

UK spec cars have a transponder chip. The car will crank but not start or run if the key is not recognised. The key fob only controls the alarm. Using the key in the door lock does the same thing as the key fob.
 
  #5  
Old 09-09-2014, 03:26 PM
flying scotsman's Avatar
Member
Thread Starter
Join Date: Sep 2014
Location: sunderland
Posts: 30
Received 3 Likes on 3 Posts
Default

Thanks. Can you think of a reason the alarm wouldnt read the transponder? It seems to be a bit intermittent.
 
  #6  
Old 09-11-2014, 06:35 AM
V126man's Avatar
Senior Member
Join Date: Jun 2012
Location: Ireland
Posts: 126
Received 72 Likes on 43 Posts
Default

The components involved are
1. The transponder chip in the key itself (unlikey as these are generally very reilable).
2. The exciter coil fitted around the ignition switch barrel - this energises and reads the key (unlikely unless you have been working at the wiring around the steering column).
3. The exciter module fitted behind the trim panel on the left below the steering coulmn - this is connected to the coil above and reads the key.
4. The security and locking control module (SLCM) in the boot behind the fuel filler neck. This receives the signal from the exciter module and checks against the registered keys. If the key is recognised it sends an encoded signal to the ECU to disable immobilisation. This module can only be programmed using dealer level diagnostics to pair with keys.
5. The ECU disables fuel injection and ignition until the correct encoded communication is received from the SLCM. Because it is integrated within the ECU the system cannot be simply overriden or unplugged.


Once the key has been successfully read and the engine has started these security components play no further part until the ignition is switched off so it is unlikely that they are responsible for intermittent behaviour during running.
 
  #7  
Old 09-15-2014, 11:16 AM
flying scotsman's Avatar
Member
Thread Starter
Join Date: Sep 2014
Location: sunderland
Posts: 30
Received 3 Likes on 3 Posts
Default

Thanks for that. Very helpful.

So like you say, the immobiliser is unlikely due to the intermittent cutting out when running...

bugger. That would have been too easy I suppose!

Fist problem I have is getting the damned thing running, it wont even try now. Have no idea if there is a spark or fuel as I've not had time to look at it yet.
I'm still convinced it's an electrical problem though. Will have to start going through every fuse and connection I can find and see what happens I suppose.

Cheers
 
  #8  
Old 09-16-2014, 06:57 AM
V126man's Avatar
Senior Member
Join Date: Jun 2012
Location: Ireland
Posts: 126
Received 72 Likes on 43 Posts
Default

See this post for a collection of no start problems.
https://www.jaguarforums.com/forum/x...ngines-120221/
A common issue -
Crankshaft Position Sensor - on cranking the rev counter should show a reading if this is working. It does not produce a fault code and there is no easy way to test. It can be intermittent (mine was, occasionally failing to start - that's why I know about immobilisation!).
Some owners have also reported corrosion on the ECU pins due to water ingress. It is behind the trim panel on the right in the drivers footwell.
Other than that it's working through the problem systematically and don't forget to check for fault codes.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Chuck Schexnayder
XK8 / XKR ( X100 )
12
09-18-2015 03:10 PM
kabs3012
S-Type / S type R Supercharged V8 ( X200 )
3
09-12-2015 10:40 AM
kabs3012
US Midwest
0
09-10-2015 01:17 PM
Bigvettefreak
XJ XJ6 / XJ8 / XJR ( X350 & X358 )
0
09-06-2015 04:27 PM
philwarner
XJ XJ6 / XJ8 / XJR ( X350 & X358 )
4
09-03-2015 10:14 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Quick Reply: alarm system help..please??



All times are GMT -5. The time now is 01:50 PM.