Sigma s30 problem

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LandyLumpy

New Member
Posts
5
!!! Huston we have a problem !!! So i've had the battery disconected to do some welding on me discovery 1 and having reconnected it the immobilizer has developed a mind of its own. The car is fitted with a Sigma s30 alarm system, The key fob still works the central locking and the alarm Ok but the immobilizer wont deactivate !! Anyone got any idea's or came across this problem before ??
 
Ok we know the alarm system manufacture is Sigma but who manufactures the immobilising system, Sigma? If so unfortunately I can't help, I'm no familiar with that product but some one maybe? Have u spoken to the installers?
 
Yes there is a cure pull alarm fuses

Immobiliser designed to fail drivable generally
 
Only bought the car last week, I assume the immobilizer is part of the sigma system, I've got a key fob and the keypad inside the car, spoken to the last owner but he cant find the code for the keypad, tried to contact sigma but nobody there till tuesday.
 
LandyLumpy said:
Only bought the car last week, I assume the immobilizer is part of the sigma system, I've got a key fob and the keypad inside the car, spoken to the last owner but he cant find the code for the keypad, tried to contact sigma but nobody there till tuesday.
Click to expand...

Ok, u have answered your question then. U can't remobilise the engine because you don't have the code to enter into the keypad.

Depending how skilful the installer was you may see the odd unprotected wire in the engine bay, if so take a few photos and post them, the model and spec of your disco would also be helpful.

Shame the previous owner wasn't more helpful in telling u the about code when u purchased the car or even writing it in the owners handbook.
 
discool said:
Ok, u have answered your question then. U can't remobilise the engine because you don't have the code to enter into the keypad.

Depending how skilful the installer was you may see the odd unprotected wire in the engine bay, if so take a few photos and post them, the model and spec of your disco would also be helpful.

Shame the previous owner wasn't more helpful in telling u the about code when u purchased the car or even writing it in the owners handbook.
Click to expand...

Or as I used to install alarms, follow my advice
 
Cant take any pics just yet as its in my mates workshop, I believe its a 200TDI and its a 93 plate, there are no wires to speak of under the bonnet as only the siren is mounted there, not located the alarm unit yet I'm guessing its inside the car somewhere, I dont understand how the keyfob still operates the central locking & alarm but not the immobilizer ??
 
LandyLumpy said:
Cant take any pics just yet as its in my mates workshop, I believe its a 200TDI and its a 93 plate, there are no wires to speak of under the bonnet as only the siren is mounted there, not located the alarm unit yet I'm guessing its inside the car somewhere, I dont understand how the keyfob still operates the central locking & alarm but not the immobilizer ??
Click to expand...

Two separate systems or functions maybe is your answer to that so to meet insurance approval, much like the 300s passive immobiliser, there seems to be loads of info on Sigma alarms installation and problems, I've just Googled to see.

I doubt there's a spare fuse for security systems on a 200s fuse board so look also for in-line fuses when u have found the control unit that is.
 
Last edited:
All sorted now, rewired from the ignition switch down to the starter solenoid bypassing the alarm immobilizer !! (removing the fuse's did'nt work lol)
 
Well done!
Bypassing the immobiliser control unit by providing a direct power supply, as u have done, is the only way.
Normally the immobiliser control unit would have provided that supply when remoblilising the engine, removing the units own power supply by whatever means, pulling fuses or plugs would leave the control unit dead therefore unable to provide the power supply to remobilise the engine.

Your lucky as it appears that u had only on immobilising circuit to bypass, some vehicles have two. :)
 
Last edited:
discool said:
Well done!
Bypassing the immobiliser control unit by providing a direct power supply, as u have done, is the only way.
Normally the immobiliser control unit would have provided that supply when remoblilising the engine, removing the units own power supply by whatever means, pulling fuses or plugs would leave the control unit dead therefore unable to provide the power supply to remobilise the engine.

Your lucky as it appears that u had only on immobilising circuit to bypass, some vehicles have two. :)
Click to expand...

depends if the system fails safe, many do and can be driven away pulling two fuses
 
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