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CANbus Resistance Values

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bikecrazy5:
don't get me wrong the led indicators are original bmw indicators from the newer models just retrofitted on to the older bikes

WarthogARJ:
Aha.
OK, I understand now.
But the dealer did not have to change anything to do this.
The newer LED's come complete with resistors to make the CANbus system think you still have the OEM bulbs.
You just plug in the new ones.
I did this myself on my bike: I installed them myself.
No errors either.
You have to order the resistors as an extra though, and the parts guy for my dealer did not know that the extra "harness" was in fact a resistor to do this.

My only issue was I needed two sets of rear LED's since the front set don't fit the HP2.
But they are great LED's I agree.

WarthogARJ:
I was looking at some other forums.
I think the closest I've seen to a solution is to power the HiD bulb directly from the BMW wiring and not use a relay.
And as long as the ballast has the same resistance as a BMW OEM H4 bulb then no Lampf faults.

But it would need to be happy for BOTH the High and Low beams.

I'll try that though: can use a couple of diodes to supply power to the ballast from either low or high beam parts of the OEM socket, but not allow them to short each other.
And then switch the HiD H4 from the High beam voltage.

Only other option is live with the Lampf faults, or else use a power resistor.

Until the Mighty HexCode GS-911 Team figures out the code!!

Haakon:
Re headlight and HID`s
Does anyone know the (resistance) values the "CAN-bus" accept?
There must be some leeway + and - ?
I do not think Hi or Lo matters
On my "table", add bad connections and so on...
My guess is the resistance can be between 2.0 to 5.5 ohms??
 
50W
12V
= 2.88 ohm
-----------
50w
14v
= 3,92 ohm
----------
-----------
45w
12v
= 3,2ohm
------
45w
14v
= 4,35ohm
-----------
Most HID ballasts draw 35Watts when the bulb is fully "on"- more during the first seconds, while its "charging".
35W
13v
= 4.8 ohm`s
------------------
I am way too tired to think so I cheated- using one of the many online "calculators"
http://www.rapidtables.com/calc/electric/watt-volt-amp-calculator.htm
For the paranoid, use the link on your own risk :-))))
 

WarthogARJ:
Haakon,
That was a good idea.
Yes, I think you're right about the resistance.

I'm going to try running the HiD ballast direct from the Low and High Beam supply of the BMW circuit.
Use a couple of diodes, and run leads to the ballast input.

And use the High/Low voltage to power the H4 High/Low beam to change filaments: as my current system does.

i think my HP2 system is a bit unusual: BMW brought out CANbus is 2004 and that's when the Hexheads started.
But they've all got OEM H7 bulbs (single filament), and not H4.
The H4 is a dual filament Hi/Low Beam.

Alan

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