Mission1979
New Member
Hello there.
I know this question had come up before, and believe me I have read a lot about this over the last few months.
Thing is now I am stuck for what to do.
I have a 1995 Range Rover SE 4.0 with a manual gearbox, no sunroof.
A while ago the battery went flat, so I replaced it. Then a few months later it went flat again. So I started trawling arounf looking for causes. The first and most glaring possible problem wwas the RF unit and the 433mHz frequency. I thought bingo, I have cracked it, must be the PIR triggered outside light right next to the car. So disconnected the window aerial and hey presto, a few worry free weeks of motoring. Since then the car has been parked away from the lamp at the other side of the house. Then a few days ago I went to get in the car and I couldnt blip the central locking even from inches away from where the sensor is concealed. Manually unlocking the doors, I found that everything was completely dead. After trying to charge battery and jump start car from a donor, still no luck, mainly due to lockout and battery wouldnt stay charged long enough to enter emergency code. So battery off car and on charge for a day on trickle. Sure enough this was enough to unlock code, start it and get it moving. So after reading another forum thread I put multimeter in line with negative lead and found that on locking the car the current settled at 0.54A. After a minute or so dropped gradually to 30mA (As the BECM went to sleep). After exactly 3 minutes the current went back up to 0.55A for exactly 2 minutes, the dropped again steadily to 30mA. This cycle repeated everytime. Even got to point I was counting it down from 10. I did the same test without locking the car with same result apart from I am sure first sleep cycle lasted 4 minutes, but I could have mis-timed it.
So to recap,
0.54A drops to..
30mA for 3 minutes
Rises suddenly to
0.54A for 2 minutes
Over a few seconds drops to
30mA for 3 minutes
...and so on.
Pretty sure its not RF based interference, what could possibly be causing this to such a specific time frame.
I really would appreciate any assistance anyone can provide
Many thanks in advance
Tim
I know this question had come up before, and believe me I have read a lot about this over the last few months.
Thing is now I am stuck for what to do.
I have a 1995 Range Rover SE 4.0 with a manual gearbox, no sunroof.
A while ago the battery went flat, so I replaced it. Then a few months later it went flat again. So I started trawling arounf looking for causes. The first and most glaring possible problem wwas the RF unit and the 433mHz frequency. I thought bingo, I have cracked it, must be the PIR triggered outside light right next to the car. So disconnected the window aerial and hey presto, a few worry free weeks of motoring. Since then the car has been parked away from the lamp at the other side of the house. Then a few days ago I went to get in the car and I couldnt blip the central locking even from inches away from where the sensor is concealed. Manually unlocking the doors, I found that everything was completely dead. After trying to charge battery and jump start car from a donor, still no luck, mainly due to lockout and battery wouldnt stay charged long enough to enter emergency code. So battery off car and on charge for a day on trickle. Sure enough this was enough to unlock code, start it and get it moving. So after reading another forum thread I put multimeter in line with negative lead and found that on locking the car the current settled at 0.54A. After a minute or so dropped gradually to 30mA (As the BECM went to sleep). After exactly 3 minutes the current went back up to 0.55A for exactly 2 minutes, the dropped again steadily to 30mA. This cycle repeated everytime. Even got to point I was counting it down from 10. I did the same test without locking the car with same result apart from I am sure first sleep cycle lasted 4 minutes, but I could have mis-timed it.
So to recap,
0.54A drops to..
30mA for 3 minutes
Rises suddenly to
0.54A for 2 minutes
Over a few seconds drops to
30mA for 3 minutes
...and so on.
Pretty sure its not RF based interference, what could possibly be causing this to such a specific time frame.
I really would appreciate any assistance anyone can provide
Many thanks in advance
Tim