Battery drain

EDVINAS KURAPKA

MEMBER
2003 BMW 530D
3.0L
6 CYL
TURBO
2WD
MANUAL
380,000 MILES

Something makes battery to drain, I found that disconnecting cas module stops battery drain. But while car in sleep mode amperage show 0.3 amps I disconnected battery and connect again then every think go to sleep and amperage meter show 0.03 amps. But when I unlock car and lock it again it would not go to sleep again. Can it be faulty cas module. I checked all fuses just number 7 stop drain it is for cas module also removing replay 30g stop drain.

Thursday, September 10th, 2020 AT 11:49 AM

3 Replies

KASEKENNY

MECHANIC
18,907 POSTS

I think you figured it out. The car activation module when reset by the battery disconnect and you plug it back in causes the module to remain asleep. However as soon as you activate it again by unlocking the doors, it is energized and then does not turn back off.

If the issue was there all the time even after a battery disconnect then I would think you had a wiring issue. However, if removing the power from the CAS causes it to go away, would lead me to replace that module.

Unfortunately I am not finding specific instructions on how to remove and replace this. So I will keep looking but I am sure that you found the issue.

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Thursday, September 10th, 2020 AT 5:37 PM

EDVINAS KURAPKA

MEMBER
2 POSTS

Thanks I will try that.

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Friday, September 11th, 2020 AT 12:34 AM

KASEKENNY

MECHANIC
18,907 POSTS

Thanks. Keep us posted with how this turns out. Thanks

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Friday, September 11th, 2020 AT 7:13 PM

Battery drain

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