Reply With QuoteIs it parked dead level ???
If you are on a slope of any kind, the self levelling wake up will be part of your problem.
Master
SupporterHi folks
My BeCM continues to wake up all night long, despite my having disconnected the antenna on the in-car fob receiver. I have also disconnected my 433mhz door bell and house energy monitor. My neighbours do not have weather stations.
I watch that damned little light glow dimly on the Park gear indicator and go out after two minutes. Most of the time it comes back on within a few seconds, and sometimes after a minute or two. The upshot is that my battery is dead a lot, and then I have a lot of fun jump starting it and listening to the horn alarm going off and seeing the "Engine disabled" messages.
I want to beat the problem, but I suspect I will be up for the receiver upgrade? Can I line my garage with 329 layers of alfoil?Anyone else beaten this problem?
I should add that I am in Carindale in Brisbane, and I have tried leaving the car locked and unlocked, always in Park, but normally with the drivers windows down.
Glen
Wizard
Is it parked dead level ???
If you are on a slope of any kind, the self levelling wake up will be part of your problem.
2011 Range Rover Sport SDV6 Autobiography
2007 Range Rover Sport TDV6
2004 Freelander TD4 SE
1997 Range Rover 4.6 HSE
1994 Range Rover Vogue
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Master
SupporterYep, the garage floor is flat concrete.Originally Posted by adm333
Wizard
OK, fair enough. If I was paying more attention I would have realised you're parking in the garage, and that most likely it's level.
2011 Range Rover Sport SDV6 Autobiography
2007 Range Rover Sport TDV6
2004 Freelander TD4 SE
1997 Range Rover 4.6 HSE
1994 Range Rover Vogue
----------------------------------------
YarnMaster
Subscriberhmmm...actually it should not matter if the vehicle is on a slope as long as all 4 wheels are essentially in the same planeI park my P38 with 2 wheels (LHS) on the nature strip and 2 wheels in the gutter. Vehicle is about 10 deg slope towards the gutter...stays like that for 48 hrs and drops evenly about 1cm... however, if 3 wheels are on the road and 1 is on the nature strip the car will gradually sink because it's trying to get equal displacement i.e same "elbow angle" of each height sensor... if that makes sense.
Self levelling should not drain your battery ... something else is waking up the BECM and dragging a lot of juice.
do the following test to check battery condition:
RangeRovers.net • View topic - Sticky: Electrical Troubleshooting Updated 2010
probably the best engineering test plan for P38 battery / charging system ever posted
good luck
Wizard
Indeed, very useful.
My vote goes to lining the garage with 50 rolls of aluminium foil... and an Armadillo helmet for the BeCM
just a thought... does the red light still come back on if you leave it neutral?
My toys, projects and write-ups at PaulP38a.com
Wizard
Agreed, it shouldn't matter. Just wanted to deploy the old "process of elimination" P38 diagnostic technique.hmmm...actually it should not matter if the vehicle is on a slope as long as all 4 wheels are essentially in the same plane
2011 Range Rover Sport SDV6 Autobiography
2007 Range Rover Sport TDV6
2004 Freelander TD4 SE
1997 Range Rover 4.6 HSE
1994 Range Rover Vogue
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AT REST
Re staying awake, this was just linked to another P38 thread:
Engine disabled
Meanwhile Jeffrey Upton came up with his own solution (he lives near Logan Airport in Boston and suffered this problem frequently). He disconnected the leads between the window RF antenna and the receiver. In this condition the remote still works fine as long as you are within a couple of feet of the vehicle, but the effect of external radio interference is eliminated! Andrew Walne came up with an even better idea -- installing a switch to control the RF receiver.
This is from this page:
Security and Alarm System Operation & Diagnosis on Range Rover 4.0/4.6/P38A
Master
SupporterOK - did that. Here are my results:
after driving around all day batt = 12.8v
eng off full elec load for 30sec then measure battery = 12.58
no load charge at battery at idle 13.95
no load charge at battery at 2000rpm 14.00
full load at idle 13.65
full load at 2000 13.7
at alt no load idle 13.95
same at 2000
at alt full load idle 13.75
same at 2000 rpm 13.8
alt body to batt ngtv -0.06v at idle
at 2000 rpm same
vlt drop from batt ng to alt earth 0.02
I think the take home point is that my charging voltage is a little low, and secondly it doesnt get much higher at 2000rpm then it does at idle. Any electrical whizs got a take on it?
Master
Definitely agree with disconnecting the wireless key antenna.
Do your doors open on their own and all the lights come on? the wireless system is pretty dumb it picks up all sorts of interference.
I had a passenger lumbar button triggering without any input.
Check that when you pull the key out the ignition detects that it is out, try pushing the barrel in after you pull the key, the becm doesnt go to sleep if it thinks the key is still in.
Use your multi meter across the fuses under the drivers seat and you will find where the power is going.
Check drain at the battery with multi meter, should be about 0.035a when a sleep, usually takes 2-3 minutes to sleep fully.
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