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+---- Thread: CIC flashing without power supply (/showthread.php?tid=20291)
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CIC flashing without power supply - deividasn - 16-12-2016
Hi, i want to flash CIC on my E61, but i dont have power supply
can i do like this? or it is will be correct?
connect + from donor car battery to + my car battery
connect - from donor car battery to my cars ground (body)
then
1 run donor car engine
2 connect icom to cars MOST bus
3 connect icom to PC LAN
4 connect icom to OBD
5 then start flashing CIC. CIA63 -> CIA62 -> CIA0
thx for answers
RE: CIC flashing without power supply - inspi1981 - 16-12-2016
Yes, possible like that
RE: CIC flashing without power supply - deividasn - 18-12-2016
Hi i was unlucky, i tried this method, donor car has 14.5v on running engine then connect to my cars battery locked icom and easy connect shows just 11.8 V. where is problem?
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RE: CIC flashing without power supply - ninja_zx11 - 19-12-2016
(18-12-2016, 21:52 PM)deividasn Wrote: Hi i was unlucky, i tried this method, donor car has 14.5v on running engine then connect to my cars battery locked icom and easy connect shows just 11.8 V. where is problem?
Sent from my Mi-4c using Tapatalk
Either your ICOM is not reading the volts correctly or the jumper cables you are using are not thick enought to withstand the current needed on your car.
RE: CIC flashing without power supply - deividasn - 19-12-2016
On running engine ICOM reading 14.5v. ICOM read correctly. i use 10mm2 thick and 2.5M length jumper cable. it's not enough?
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RE: CIC flashing without power supply - Node - 19-12-2016
The problem is 99% in your cable:
10mm2 and 2.5m long cable is on a weak side, but should be enough, given all other conditions are perfect. Cheap cables have really crappy (thin and weak) clamps and they are the source of problem. That said it also depends on where you connect the cables on both cars. Are you using terminals under the hood or you connect to battery? 2.5m 10mm2 cable itself has a drop of at least about 0.5V at 50A. If you have crappy clamps, easily add 1-2V more. If you connect directly to the battery on both cars, and if it has quite low charge on recipient car, add 1-2V more and there you are, 11.8V...
Now the cable from the alternator to the battery in the trunk is also quite long, so need to take that into account as well, though its much bigger than 10mm2. Terminals under a hood have a shorter path to the alternator, so it should be worth to connect to those clamps at least on donor car. On the recipient car I prefer to connect directly to the battery when using 2 car setup, and charge it for a while until its voltage raises.
Remaining 1% is due to a possible fault in the battery of recipient car which shorts one of cells and then battery itself and then your cable just can't push enough current to keep its voltage. What's the voltage in recipient car when engine is running and when its off, without additional supply?
RE: CIC flashing without power supply - deividasn - 19-12-2016
(19-12-2016, 11:25 AM)Node Wrote: The problem is 99% in your cable:
10mm2 and 2.5m long cable is on a weak side, but should be enough, given all other conditions are perfect. Cheap cables have really crappy (thin and weak) clamps and they are the source of problem. That said it also depends on where you connect the cables on both cars. Are you using terminals under the hood or you connect to battery? 2.5m 10mm2 cable itself has a drop of at least about 0.5V at 50A. If you have crappy clamps, easily add 1-2V more. If you connect directly to the battery on both cars, and if it has quite low charge on recipient car, add 1-2V more and there you are, 11.8V...
Now the cable from the alternator to the battery in the trunk is also quite long, so need to take that into account as well, though its much bigger than 10mm2. Terminals under a hood have a shorter path to the alternator, so it should be worth to connect to those clamps at least on donor car. On the recipient car I prefer to connect directly to the battery when using 2 car setup, and charge it for a while until its voltage raises.
Remaining 1% is due to a possible fault in the battery of recipient car which shorts one of cells and then battery itself and then your cable just can't push enough current to keep its voltage. What's the voltage in recipient car when engine is running and when its off, without additional supply?
thx for reply!
1. I using terminals under the hood
2. When my car is on running engine its 14.8v and when is off is 11.8v (light on)
3 Donor car on running engine 14,5v when off 12,2V
checket with digital multimeter
should i buy new cable like Diameter: 25 mm². current: 350 A. lenght: 3,5 m
RE: CIC flashing without power supply - Node - 19-12-2016
Better measure the voltage in your car first thing in the morning, before starting the engine. This will show battery state much better.
3.5m 25mm2 at least corresponds with official BMW cable. But look at those clamps first. The copper in them must still be like 1-2mm thick. I can't tell that from the picture.
RE: CIC flashing without power supply - bobdinro - 19-12-2016
Put terminals ON BATTERY!
RE: CIC flashing without power supply - ninja_zx11 - 19-12-2016
Just check the voltages on both ends of the jumper cable.Its easy to find the voltage drop.And if the jumper cable is dropping that amount of voltage then the clamps or cable must be getting warm.