Renault megane scenic that you can not get the immobiliseroff ihave changed the batteries on the fob but the problem seems to be from the sensor on the roof?

Answer 1

These key fob often fail, generally its the infra-red L.E.D. ( not the little red light that you can see lighting beside the fob button) light that fails, to check this you need a digital camera, the one on your phone will do.

hold in the button on the fob in and take a photo of it

the photo should show a white glow from the L.E.D.

if you can see the glow in the photo the problem is else where ie the sensor in the roof panel, or at the fuel solenoid. both can be bypassed

the roof sensor needs a very small spring loaded switch that only works when pushed, upon releasing it the current is switched off, similar to a push button starter switch.

the fuel pump solenoid can be by passed by connecting the live wires to bypass the sawitch - its not live when the ignition switches off so it wont drain the battery.

If the L.E.D. doesnt light up then its probably the led itself, generally the soldered wires to the L.E.D. have come loose and simply need re-soldered on.

if you need a new L.E.D. an auto electrician should be able to get one and solder it into your existing fob, no need to change sensor in the roof or anything, for a lot lot lot less than a Renault dealer would ask.

mine cost £15 so i got new L.E.D. lights both keys fitted for £25-00 and fitted new batteries to both for an extra few quid.

Scenic 97 1600 8 valve