How to disable immobilizer system on my rover 400 and use only key

The immobilizer stays active until you actually try to start. To start (and turn the immobilizer off) the key needs to be in the ignition, the code in the fob read by the security system and the ignition switched to start - this is when the immobilzer LED goes off.

If the car was unlocked and had the correct key the car would still not start unless the key was attached to the correct fob.

Difficult without more info however Old school 1 are the batteries in the fob good, are there any fault lights on dash?2 have you removed any components like ignition switch, steering column, bonnet immobiliser switch on inner mudguard? 3 Check connections on this switch or hold down while trying to start car.

has your car got the round plip ? if so and you have checked the batteries and it locks and unlocks the car but does not disarm the security system the problem could be the scu which is located on the lh bulkhead/ footwell area inside the car and is prone to water damage, it is not easy to disconnect the imobilizer because it works in conjuction with the engine control module which needs a ok to start signal from the scu before you can start. if its the older type plip, you can disable the immobilizer by using the key access code which you should have in your handbook/info pack. this involves turning the drivers door lock in both directions a number of times to match the code, if this info does not help you need to find somone with rover testbook or t4 diagnostic equipment, hope this helps.

I have the same problem sometimes
1 Check the condition of your battery, if old, it will not give full power required to communicate with the security system.
2 If you don't have the EKA of your RR, try this next time you get caught, put key in the drivers door look, press unlock button on key fob and at the same time turn to unlock, if all locks unlock then the engine should not be immobilized - Good luck

inside your key fop were the battery fits there is three soldered points
just check they are connected properly if not just re-solder the connection i had the same fault on my rover 400 and that sorted it. if you are not sure about the connections being soldered correctly fold a small amount of paper and put it on top of your battery holder and refit your fop and then try it that should work just as well.

SOUND LIKE PROBLEM IN KEY IMMOBILIZER CONTROL MODULE.THIS IS A DEALERSHIP FIX.

I show immobilizers where only started in the 1998 accords, if you have a remote starter and they used a key in the box bypass all you need to do is find the box under the dash open it up and use the key

not sure about this model ,depends on year but removing fuse F! stop immobilisor from working

Immobilizer system can be disarmed using 4 digit code from vehicle security card as detailed in owners handbook.

you need to have a new key fob programed to de immobillize the vehicle there is not really a way round this with out big wiring changes