BECM Box programming

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mistco

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I have a P38 Range Rover Vogue 4.6 V8 Petrol, with Nicholson McLaren SRi Autogas which I don't use as it's faulty.

In July 2012, whilst parked on a camp site in Lincs my 4 hazard lights came on [and stayed on]. They weren't flashing, just stuck in the 'on' mode.
Disconnected battery overnight then drove home next day. No further problem until going back to the same campsite 2 weeks later, and guess what? Yep, the hazards came on and stayed on!!
Car had major service following day and all was well until 25 August when I went back for the third time to the same campsite.
During that same day, people told me that the alarm kept coming on and going off, and yes, the hazards stayed on!!
I was recovered by my breakdown service to my specialistRange Rover garage near my home in Wisbech, who reprogrammed the BECM Box in about 20 minutes, and the car seems fine now.
However, the garage advised me that they have not necessarily cured the problem because whatever caused the hazard lights to keep coming on has not been identified, and the car could still let me down!

Some opinions suggest that the original hazard light problem is where the origin of the problems begin, and may have caused the BECM box to finally shut down. The BECM box may have shut down because it decided that the car was "being tampered with" and shut down to prevent further tampering. This 'tampering' didn't actually happen, but the BECM box reacted as if it WAS being tampered with.
Others suggest that carrying car keys in your back pocket and then sitting on them can cause the BECM box to be confused and it then shuts down because the 'remote' has been activated by sitting on the key fob.
Next week my garage are replacing both sets of buttons for the two sets of keys [cost about £20] that I have as the remote buttons have now 'lost' the little rubber covers that activate the locking/unlocking mechanism and the coin-operated battery access covers are burred over so they're going also. So, the car is parked at home unlocked, which is far from ideal!
There could also be a fault in the BECM box itself which was replaced in 2009 when I bought the car.

Has anyone had a similar experience on a 2001 P38 Vogue? My garage has at least two other 2001 Range Rovers which demonstrate identical behaviour to mine; the garage imply that 2001 P38's have this problem in common.....
Any help would be so welcomed.....thank you for reading all this.
 
Given that it has happened at the same location, I would guess that something is interfering with the RF receiver. I don't know why it is giving such odd systems. Plenty of threads about interference. You'll need the latest RF receiver which filters out stray signals.

G~
 
I've had this happen just once, when I was parked outside Shaun 69's house. My battery is good and I've recently checked all my electrics, ECU connections included, so I'd be leaning towards RF as a first check.

You mention Lincs and I can't help thinking; flat country, RAF and radar. Then you mention your local Landy garage, you couldn't be living near any military facilities or similar that might be triggering this?

If you're going back to your campsite anytime you could try disconnecting the RF aerial.
 
I've had this happen just once, when I was parked outside Shaun 69's house. My battery is good and I've recently checked all my electrics, ECU connections included, so I'd be leaning towards RF as a first check.

You mention Lincs and I can't help thinking; flat country, RAF and radar. Then you mention your local Landy garage, you couldn't be living near any military facilities or similar that might be triggering this?

If you're going back to your campsite anytime you could try disconnecting the RF aerial.
First I thought to discount the RF issue, but given the information above now sounds like a good call ^^^^^ what he said...
 
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I used to get the same issue with the indicators, all 4 on - not flashing when parked overnight on my driveway. This proved to be a symptom of the battery discharging due to the alarm not sleeping properly because of interference and an old type RF receiver. I had a wireless energy monitor connected to my electricity meter at the time and believe this was the cause of the interference. I proved the battery drain with a DC clamp meter. The current drain would drop for a few seconds when the alarm went into sleep mode then rise again. The indicators and sometimes the alarm used to activate as the battery charge dropped. If I did not notice the indicators being on the battery would fully discharge overnight. I removed the wire from the RF receiver and have not had the issue since.

Long way round but I would agree with previous answers, possible RF receiver issue.
 
Did the latest version of the RF receiver ever get fitted to production models or was it only introduced after 2002? My '97 had the original version and the '99 had the second attempt. Also you dont hear much of the RF issues in the US but not sure why.
 
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