leds on disco II

[Austin Shackles]

anyone fitted LED indicator bulbs, and if so did they work -

a) without load resistors
b) with load resisitors?

The BCM does indicators, AFAIK, and thus there isn't a flasher unit to
either replace or doctor, unlike the earlier models. Chances are it'll go
apeshit with "wrong" loads...
--
Austin Shackles. www.ddol-las.net my opinions are just that
Travel The Galaxy! Meet Fascinating Life Forms...
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a webcartoon by Howard Tayler; I like it, maybe you will too!

[Dave Liquorice]

On Mon, 14 Dec 2009 10:43:48 +0000, Austin Shackles wrote:

> The BCM does indicators, AFAIK, and thus there isn't a flasher unit to
> either replace or doctor, unlike the earlier models. Chances are it'll
> go apeshit with "wrong" loads...

Surely only the thermal flasher units go ape shit with wrong loads.
I'd expect a computer just to toggle the relay drive at the same rate
regardless. If there was some "bulb blown" detection it might vary
the rate as an indication.

--
Cheers
Dave.

[Alex]

I would have thought that too, so why do modern cars with EBCM flash
the inidicators with a different cadence when the hazards are on? The
amount of on-time is distinctly shorter.

Alex

[Austin Shackles]

On or around Mon, 14 Dec 2009 12:34:55 +0000 (GMT), "Dave Liquorice"
<allsortsn...@howhill.com> enlightened us thusly:

nah, there's a requirement to have a bulb-outage indication by flashing at
either faster or slower pace. Thermal flasher units flash very slowly or
not at all with only 1 bulb in place (eg old series motors) - electronic
units have load-sensing and use this to make it flash (usually) very fast.
Putting LEDs instead of bulbs makes the unit think a bulb has gone. However,
on those, the bulb-outage can be disconnected on the circuit board - easier
if you can identify the corrcet pin of the little IC is the bulb outage
signal. The more clever electronic ones also have load sensing for
more-than-normal bulbs, and use this to flash a trailer light on the dash.
This is why the trailer light if you have one flashes when you run the
hazards.

thing is, the DII doesn't have a flasher unit as such, the lights and
flashers and so on are switched by the BECM via relays. I suppose I could
remove a bulb and see what it does. It's not immediately obvious how it
does bulb outage sensing, if it does.

doesn't answer my question though :-)