Cost / Time Requirements
Prices: £5 > £15
Prices: £20 > £30
20 to 40 Minutes
The Alarm Horn Louder:
is a simple modification you can do to all MK1 mondeos to make the
alarm horn louder. The mondeo's alarm horn is located (for a reason
known only to some designer at ford) inside the cabin, behind the
sound deadening material and carpet of the boot. As a result of
all the sound proofing it produces a rather pathetic beep noise
which isn't nearly loud enough in a busy carpark. This how-to explains
how to incorporate your front car horn(s) into the alarm system.
your model spec is GLX or below then you will only have one horn
as standard - to maximise output its recommended that you upgrade
your existing horn to twin's. To do this you need to get a second
horn from a scrapped mondeo and install it in the mounting position
(RHS - Next to screen wash bottle). You then need to run a cable
from the single connector on top of it, accross the engine bay to
your original horn (LHS), and splice into the cable supplying that
horn. If you have a higher spec level then you will probably have
this second horn already installed.
mondeo horn is permanently live, meaning that you can use it with
or without a key. Its also fed via a relay so there is no security
risk associated with connecting to it. However its switched negatively
which causes a few small problems and requires a relay to overcome
of the wiring shown in black is existing, the blue wiring (and relay)
you need to add.
This Circuit Works:
the alarm activates it sends a 12V pulse out of pin 4 on connecton
C451a. This pulse makes the alarm horn H5 activate and beep. We
can use this 12V feed to energise a new relay by taking a splice
just before the alarm horn (Connection Point 1). Grounding the other
end of the relay's coil makes the relay energise and de-energise
in time with the pulses from the alarm system (Connection Point
2). The other side of the relay acts as switch, so by taking one
pin to ground (Also Connection Point 2) and the other pin to (Connection
Point 3) we get a ground pulse being applied to horn switch - just
as if the steering wheel's horn button had been pressed. This in
turn energises the existing K33 Horn relay and makes both front
horns beep in time with the alarm.
aware that Ford didn't do this because the effect of all three horns
activating exceeds the noise level allowed by UK law for alarm systems.
Point 1 > On the left side of the boot, behind the wall carpet.
Splice into the Orange/Green cable supplying the alarm horn.
Point 2 > Use an O or P Crimp connector and use the ground
bolt of the existing alarm horn.
Point 3 > Locate the connector C11 (Mk1) above the
passenger fusebox and connect to the Black/Blue cable on Pin 16.