Hi
I have a battery drain, system will not go to sleep, p light stays on after 16 minutes turns off then within 2 seconds lights back up. current draw fluctuating between 1 amp down to .500 milli amps,

I have disconnected heater unit and resistor
pulled fuses for radio, engine, central, alarm , engine can put zke in to sleep mode by forcing through auto logic have used a 2nd hand zke unit but no different unsure if zke unit is any good ?

any ideas kind regards Ryan

Is this an E39 or an E 60?

yes sorry Andy this is e39..

Does this car have a Webasto additional diesel fuelled heater unit?

fault fixed,

I disconnected the additional heater unit and the vehicle has been fine since, thanks for quick reply.

Regards ryan