BeCM waking up - dead battery

**996TURBO** · 14th March 2011, 12:05 AM

Guys, stop paying outrageous prices for batteries. Have a look at boat batteries. I found a 125ah and 1000CCA that has the same size as the OEM land rover battery for a ridiculous price : 110 euros. 4 years warranty and deep cycle.

**glenhendry** · 2nd February 2012, 12:49 PM

The situation has finally been resolved. Completely. There are three thread that are related, I will finalise them all; here is the list:
- "fob handset sync"
- "Becm waking up"
- "engine disabled"

The solution ,as predicted by many who helped, was to buy the upgraded RF receiver (YWY500170). I got one from Island 4x4 for GBP141. It is very easy to install and requires no resync or setup.

Now the car is sleeping peacefully in the garage and on the street, with doors locked or unlocked. I am very relieved.

I think the main lesson here is that if your car is waking due to these errant signals, get it fixed (or remove rf receiver) before it drains your battery, thereby rattling and ruining your door locks, and confusing your becm into forgetting your fob codes. Better still, dont buy a house with 433mhz radiation around the place.

Sorry for the duplicate posts on these threads.

**rockstar** · 3rd February 2012, 10:51 PM

Bet you slept like a baby that night!!

I am sure you now qualify for some sort of RR degree now!!

Good on you for persevering and hopefully now you can get on with enjoying one of the finest machines man has made (according to me anyway)!!

**glenhendry** · 24th September 2013, 06:44 AM

Even with the new RF receiver installed, I have been getting the car waking up all night long. I believe I have traced it to the ODB scanner bluetooth transmitter plugged into the ODBII port at passengers feet.

I used this excellent resource (RangeRovers.net Forum) to determine what items cause the BeCM to wake, and determined that many pins from the ODBII port could do it.

I use this ODB scanner (PLX Kiwi Bluetooth | OBD2 OBDII Android), which is excellent compared to the cheapies on ebay. I hook it up to my android smartphone over Bluetooth, running the Torque app. However, since I leave the scanner plugged in 24x7, it must be drawing on the ODB port occasionally and waking the BeCM.

I will now have to hook up a switch on the dash that interrupts power to the ODBII port so that I can turn it on (the port) only when using the Torque app. I often monitor the LTFTs and the O2 sensors as I am trying to fix a rich running condition (which I have narrowed down to either an underperforming fuel pump or a leaking inlet manifold gasket).

Edit: This is confirmed, the voltages are better in the mornings now with the diagnostic device disconnected. Better than a switch in the cabin, a relay off the ignition may be better to power the ODBII port, who needs to diagnose the Becm with the ignition off anyway?

Thread: BeCM waking up - dead battery

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Situation resolved.

ODB device wakes car

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