Module isn't shutting off? help solve my battery problem

[John Galt]

My P light stays on all the time, I don't think it is anything to worry about? If you think the FSR is bad, I would replace it.

[Weasel]

The FSR is only for the internal blower fan that blows the air in your face... The fan under the hood could be a problem, check draw with it unplugged.

[killcrap]

the Aux fan in front of the engine is a common culprit for parasidic draws. it also has a Final Stage Resistor built in, in which the DME sends a PWM signal to activate. The software for the DME was revised to check the AUX fan for operation when it was determined that some AUX fans were faulty without throwing the check engine lamp, There were several recalls on these fans, as most of them started a fire and total losses ensued. The DME briefly activates the Aux FAN, then turns it off, it then switches to measurment mode in which it attempts to measure the amperage generated by the moving aux fan to determine if fan activation was successful. A faulted AUX fan is known to Draw up to 2 Amps. Other failures that can cause parasidic draws are the Final Stage Resistor for the blower. The MRS control unit(usually a K-BUS is down, and you cannot communicate with the Body), The instrument cluster(gateway for BUS systems), The Ignition switch as KL15 is sometimes open circuit. The CD53 and BM53 Radio for staying on too long after Load Circuit 2 has been shut off. Good Luck.

[killcrap]

here is posted information from BMW about the strange phenomenon of its shifter lights on e53, hope this information i have posted will help someone.

[diyanich]

Question to Killcrap:

How much the faulty instrument cluster would draw?

[Mdorphin]

Problem Solved!

Well sure enough, the Auxillary Fan was the problem and had to be replaced. With the amp meter plugged in, the original would keep it at .23 with the car asleep. When the new auxillary fan was plugged in, it immediately dropped to .02 and we left it at that (said screw it for the P light). Thank you all so much for your help especially Weasel and killcrap. Couldn't have done it w/o you.
FYI the part was $534....

For all you other people out there with the battery problems, make sure you do a draw test before you head to the dealer. Pulling the fuses in the glovebox is a good start.

Any questions feel free to pm.

Originally Posted by Weasel

The FSR is only for the internal blower fan that blows the air in your face... The fan under the hood could be a problem, check draw with it unplugged.

Originally Posted by killcrap

the Aux fan in front of the engine is a common culprit for parasidic draws. it also has a Final Stage Resistor built in, in which the DME sends a PWM signal to activate. The software for the DME was revised to check the AUX fan for operation when it was determined that some AUX fans were faulty without throwing the check engine lamp, There were several recalls on these fans, as most of them started a fire and total losses ensued. The DME briefly activates the Aux FAN, then turns it off, it then switches to measurment mode in which it attempts to measure the amperage generated by the moving aux fan to determine if fan activation was successful. A faulted AUX fan is known to Draw up to 2 Amps. Other failures that can cause parasidic draws are the Final Stage Resistor for the blower. The MRS control unit(usually a K-BUS is down, and you cannot communicate with the Body), The instrument cluster(gateway for BUS systems), The Ignition switch as KL15 is sometimes open circuit. The CD53 and BM53 Radio for staying on too long after Load Circuit 2 has been shut off. Good Luck.