Hi,

Just wondering if the standard factory OEM alarm on my 1998.5 A4 B5 has a negative trigger input?

I've heard that there's an optional ultrasonic sensor add-on from the factory which connects up the alarm and central locking pump in the boot (trunk), so I'm thinking this module would use a negative trigger to trigger the alarm?

Anyone know what colour wire the negative input would be going into the central locking pump?

Thanks.