Datatek
Well-Known Member
- Posts
- 45,015
- Location
- Near Poitiers SW France
It's been a few days since my last post, but I've finally made some progress with my main issue; the battery drain. Thought I'd better post an update, should anyone have the same issue...
It turns out the RF receiver wasn't the cause of my problem, though it may not have been helping so I've left the antenna off until I get the replacement unit. 3½ days after giving the battery a full charge she was dead as a dodo again. Now knowing a bit more about how the BECM works, the current it should draw when awake & asleep, and how long it takes to go to sleep, etc, I decided to re-do my fusebox elimination test from scratch.
After waiting 2 mins for the BECM to go to sleep, the current draw dropped from the normal 700mA, but not as far as the 30mA as it should have.. it was still registering 120mA with a sleeping BECM. I set about pulling each fuse in turn; none of the fuses in the engine bay made any difference, but the 4th fuse I pulled from under the seat saw the current drop down to the 30mA I was looking for.
So I've found the circuit causing the problem.. interior fuse 4, which is the "Transfer Box ECU", which also ties in nicely with the fact that I haven't been able to use low range since I bought it - something I wasn't immediately concerned about as I don't plan to do any off-roading at this point.
So the battery's back on charge and should hopefully stay charged for weeks rather than days, now I've removed the offending fuse. I will get around to fixing the transfer box one day, but it's not exactly vital for every day use. I'm one happy camper.
I should fix it sooner rather than later, if you ever need to tow it you need to be able to select transfer box neutral. I would guess it's the motor, but it's possible it's stuck slightly off the end of travel.