Battery Drain - help!

Hi all. Past 2 weeks my d40 has developed a battery drain. I measured it at 1.4A and narrowed it down to the Fuse bank that contains the BCM although it only dropped it down to .4A on removal.

Before I start disconnecting things coming from the BCM, has anyone had to change their BCM before?

Cheers
Dan

danlincs said:

Before I start disconnecting things coming from the BCM, has anyone had to change their BCM before?

Cheers
Dan

Click to expand...

I changed my BCM and ECU. If you change either or both the key needs to be reprogrammed because the four components ... Key, ECU, BCM and IMMO are coded as a set.

Changing the BCM is two minute job and simple to do.

Update
Did some more investigation yesterday, there's a 500mA drain from;
Interior Passenger FuseBox Fuse 19. Dropping the key off load draw on the battery down to 100mA when removed.

I've removed the Front Air Control Unit and the Rear Diff switch to see if it's these. But it's not.

Can anyone tell me where I can find some wiring schematics for the vehicle? Before I have to start stripping back the wiring harness and following the FUSE 19 power feed.

danlincs said:

Can anyone tell me where I can find some wiring schematics for the vehicle? Before I have to start stripping back the wiring harness and following the FUSE 19 power feed.

Click to expand...

https://navlife.com.au/d40-series-service-manuals/
Download the workshop manual for your Thai or Spain D40 and you'll have the wiring diagrams. The wire colour code legend is in the general information (GI) part of the manual.

I'm pretty sure you have covered this, I was suffering battery drain initially with my D40, I had no idea that the cigarette lighter in the dash was powered 24/7. I had a phone charger in it connected to my wireless charger cradle.. it was slowly sucking the juice when I was only driving the ute once a week or so.

Phunk said:

I'm pretty sure you have covered this, I was suffering battery drain initially with my D40, I had no idea that the cigarette lighter in the dash was powered 24/7. I had a phone charger in it connected to my wireless charger cradle.. it was slowly sucking the juice when I was only driving the ute once a week or so.

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Yes good point.

Also the OBD port is directly wired to the battery so it's powered 24/7. I use a Bluetooth dongle in the OBD port to run TorquePro. Occasionally I've forgotten to unplug the dongle and it's slowly drained the battery.

Scott52 said:

Yes good point.

Also the OBD port is directly wired to the battery so it's powered 24/7. I use a Bluetooth dongle in the OBD port to run TorquePro. Occasionally I've forgotten to unplug the dongle and it's slowly drained the battery.

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Bingo... I was one of those people too!

I've got an android head unit and have Torque running on it to show boost / water temp and ironically enough - voltage.