I changed the battery in my 1996 bmw 523 and it now won't start. It doesn't even turn which makes me think it's the immobiliser cutting it out. Does anyone know how to fix/ re code it? I don't really want to spend a lot on the car as i only recently bought it for my mum. Just wish the bloody thing would work!!!
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First thing I would do is make sure the batter cables are secure and tight to the battery post and make sure the red cable is to the + side of the battery and black is on the - side of the battery. They need to be tight and snug in order to put out the amps needed to start the car. YOu can also put a trickle charger on the battery over night at the 2 amp setting and make sure it is charged up. I would guess one of those problems is what is causing you your grief.
Remove battery terminals and clean both posts and terminals with sandpaper until you see shiny metal. The black coating is lead sulphate which has a high resistance to current flow both into and out of the battery. Also check the battery in you key as the immobiliser may not be reading it.
Check engine immobiliser and key battery. Have the fault codes read for faults Replace the faulty units with genuine one because most aftermarket units are not set for OEM cpu units and are not completely compatible.
Switch on head lights or cabin light. If they doesn't come on or is weak, the battery is flat. Ensure that you switch off the lights. With ignition switched on, assuming the lights on the instrument panel cames on and your immobiliser is deactivated, turn ignition to start. You should hear the solenoid at the starter making a click sound. If not, the battery is flat or the starter solenoid is faulty. If it does make a click sound, the battery could be too low to turn the starter or the starter is faulty. Assuming the immobiliser is working correctly, and the starter tries to turn the engine but it doesn't want to turn, the gasket could be blown and the cylinder filled with water, or the engine could be seized. Hope it is not the last case. MarioCpt
There is one method you ca try, first ensure the car is unlocked but with the keys out of the car. then disconnect the battery for about 2hrs, overnight if possible. this should reset the car immobiliser and ECU. When putting the battery back on connect the red first then the black i that order.
If no joy get back to me I have a few oher solutions.