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Pelican Technical Article:

Horn Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$110

Talent:

**

Tools:

10mm socket, Philips screwdriver

Applicable Models:

Porsche 993 Carrera (1995-98)
Porsche 993 Carrera 4 (1995-98)
Porsche 993 Carrera 4S (1996-98)
Porsche 993 Carrera S (1998)
Porsche 993 Targa (1996-98)
Porsche 993 Turbo (1996-97)

Parts Required:

Fuse, relay, horns

Hot Tip:

Give everything behind the liner a good cleaning

Performance Gain:

Working horns

Complementary Modification:

Check your bulbs

For some reason, driving a classic expensive car seems to be a magnet for every idiot out there "driving" along while on their cell phones, tablets, reading the paper or putting on make-up; basically doing everything but paying attention to the seriousness of driving an automobile. The horn is probably the most important way to gather the attention of those driving around you before they wander into your car.

Porsche has dual tone horns in the 993; one being a high frequency and the other being lower. This is to make sure they are covering all spectrums of the sound wave lengths so even people with partial hearing can hear you when you use them. Porsche redesigned the trumpets over the years, so make sure you are ordering the proper horn for your year, make and model.

Before replacing the horns make sure to check your fuse and relay and then check that power is actually getting to the horns. You will need to remove the front right wheel well liner to access the horns. While some people say you can remove the liner and replace the horns with the wheels on I recommend you safely lift and support the front of the vehicle; please see our article on safely lifting and supporting your Porsche 993 for additional instructions. Use care when placing your jack stands to make sure they are clear of the liner.

If your horn is not working you should start diagnosing the problem by checking the fuse and relay.
Figure 1

If your horn is not working you should start diagnosing the problem by checking the fuse and relay. Open the hood and pull back the carpet. The relay and fuse box is below the right side A-pillar in the front. Release the two clips and open the lid (red arrows).

Check with the manual for your vehicle and inspect the fuse.
Figure 2

Check with the manual for your vehicle and inspect the fuse. On our project car the dual horn fuse was number three and 15 amps (red arrow).

If the fuse is good check the relay with the good spare you should be carrying.
Figure 3

If the fuse is good check the relay with the good spare you should be carrying. Again check with you manual but the red arrow indicates the dual tone horn relay on our vehicle. If the fuse and relay are fine then you will need to remove the right front wheel well liner to check for power to the horns and/or replace them

To remove the forward liner begin by removing the Philip head screws including the three that join the liners on the top (red arrows).
Figure 4

To remove the forward liner begin by removing the Philip head screws including the three that join the liners on the top (red arrows).

Working under the vehicle remove the two 10mm plastic nuts holding the liner to the forward protection tray (red arrows).
Figure 5

Working under the vehicle remove the two 10mm plastic nuts holding the liner to the forward protection tray (red arrows).

There are two pieces of weather stripping on the forward liner (red arrows).
Figure 6

There are two pieces of weather stripping on the forward liner (red arrows). Once the liner is removed this is a good time to clean these out and get some rubber protectant on them.

You need to remove the liner from the wheel arch as this makes it easier to get off the air duct on the inner fender well.
Figure 7

You need to remove the liner from the wheel arch as this makes it easier to get off the air duct on the inner fender well.

With the liner removed you can see the dual tone horns (red arrows).
Figure 8

With the liner removed you can see the dual tone horns (red arrows). The horns will have different serial number depending on whether they are the high or low frequency horn, make sure to get the right one.

Begin by removing the leads to the horns by pulling out the spade connectors and checking for voltage while a friend presses on the horn (red arrows).
Figure 9

Begin by removing the leads to the horns by pulling out the spade connectors and checking for voltage while a friend presses on the horn (red arrows). If you are not getting voltage and the fuse and relay are fine then you have an electrical issue somewhere that you will need to trace down; it could be a pinched wire or something like the contact ring behind the airbag. If you are getting power to the horn and it is not working simply use a 10mm wrench or socket and remove the single screw and install a new horn. Installation is the reverse of removal.


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Page last updated: Fri 12/15/2017 03:12:05 AM