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Discussion Starter #1 (Edited)
Hi, recently purchased a 95 Laguna with the following fault: Will not start, stop lamp in display on, usual display lights show when switching on ignition(except the preheat light just flashes for an instant), starter turns fine but no ignition! I have tried the following: disconnected the battery overnight, then reconnected, no change. Activated the central locking in the correct way and tried to start within 10 seconds of entering the car, no change. The feeds to the preheat and fuel cut off are lacking i.e. no voltage present. Is there an electronic immobiliser, and if so where is it? is it possible to circumvent this ? Haynes manual is useless, wrong wiring colour codes and mickey mouse diagrams. I am an electronics technician, so is there anywhere I can obtain a good electrical schematic diagram? Thankyou for reading this. Sam
 

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Hi Sammy sounds like your immobiliser ain't disarming - thus preventing power to cut-off solenoid and glow-plug timer. There are numerous posts on here relating to this problem - if I find some I'll post a link:)
 

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Further details

I have managed to get hold of the technical details for this model, the main computer which is controlled by the central locking system feeds a coded signal to the fuel stop solenoid (its a digital signal) so if the computer fails, the car will not start, it is reasonably easy to get around this by feeding a seperate 12v supply (via the ignition switch) to this solenoid - although the solenoid is well protected against such an activity, but in the end its just a solenoid and Renaults own tech instructions gets around this problem. In my case it was the failure of the pre-heat system that prevented me from starting, again, although lots of electronics involved, its easily circumnavigated using a seperate switch to operate the relays for the pre-heat for the glow plugs. Renault must have had a few problems with this engine running smootly when cold as there are lots of additional activities going on in this unit, but what the heck, as soon as its warm everything is AOK. These cars are great if you have a degree in electronics!
 
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