Part Number :- 111999155A / 111 999 155A for Volkswagen and Audi cars.
(No mention of commercial vehicles).
It is almost identical to the Cobra alarm that was fitted to the van when it still roamed the UK roads in the late 80s upto winter 1990.
The Cobra alarm had been repaired to a degree, but was really only bin fodder.
As part of the van rewire, I have prepared the wiring from the VAG alarm to look like it was factory fitted.
The van will have a proper Thatcham approved immobiliser in due coarse, but I do like a bit of OEM retro stuff.
So here is the knackered old Cobra alarm that now resides in my local-authority landfill.
And here is the VAG unit.
I have attached the fitting instructions.
What they don't tell you about are a thin blue, and thin black wire that goes from the alarm head to its six-pin spade connector.
The main loom only has four wires.
Red wire for un-fused battery live.
Black for switched ground.
And two yellows to flash the indicators.
So - does anyone know what the thin blue wire is for.? Assuming the thin black is a ground for something.
Warning LED perhaps???
There is nothing on the tinter-web about this unit.
Until now of course.
The alarm uses a two pole switch to turn on the alarm and kill the ignition in one position, and to kill the alarm and enable the ignition in the other position.
Black wires are for alarm switched ground.
Green wires are for the immobiliser (ignition live to coil feed).
Crude but effective if the switch is well hidden.
I will be using an "obvious" dash switch to kill / enable the ignition supply. (Immobiliser),
and the "key-in" ignition switch position for the alarm via a relay (87a) contact.
How many chancers would use a key to steal the van?
and
How many would have time to open a cab door and put the correct key in the ignition switch within seven seconds?
I suspect even I would struggle to 'beat the clock' before being welcomed by a rousing 120dB siren.
Nice!
For Info - any switch of a suitable rating could be used to cut the feed from Fusebox terminal D15 to the coil in the engine bay.
Or you could do similar if you use a starter / hard-start relay.
Just put a switch to cut either wire for relay terminal 86 or 85. Simples!!
