I have a 1996 993 recently purchased, ya! for me. Im happy. one little issue is that when i brake my horn is sounding. maybe you all can help. Ive not noticed any warning lights, maybe the horn has a short, or is the horn used as warning for worn brake pads? Thanks D

 

Most likely the horn ring. Simple DIY. Read post below.


DIY - Horn Retaining Ring R&R

This DIY will explain how to remove and replace the horn retaining ring for a 97 993 with the standard 4-spoke steering wheel. This fixes the problem where the horn sounds when braking. The problem began appearing on my car this spring when air temperatures began to climb above 80 degrees. There are rubber suspension grommets in the ring which become soft and too elastic and permit the horn contact to be made when braking.

Pictures for this DIY can be found here:
https://picasaweb.google.com/bruce.c...Nq6n6Xn8p2kEg#

Parts & Materials Needed

993-347-088-01 horn retaining ring $75 at Sunset Porsche
Dielectric grease (optional - for battery terminals)
Security code for radio


Tools Needed

T30 Torx Socket Driver (I used Snap-on #FTXL30E. It is 4-1/2 inches long with a 3/8 drive.)
or
T30 Screwdriver, 8 inches long (any longer and it won't fit between the dash and the steering wheel.)
13mm wrench and socket (for battery terminals)
19mm wrench (for the 4 bolts holding the retaining ring in place.)
Battery cleaning brush
Battery terminal puller (optional - useful if terminals are corroded)



Procedure to Remove and Replace Horn Retaining Ring

Note mileage

Removal

Disconnect batteryWait 15 minutes to let air bag capacitors drain

Remove the 2 T30 torx bolts in the steering wheel hub (they will remain inside the hub)

Pull the air bag pad away from the steering wheel

Disconnect the 3 wiring connectors (black, red, and yellow) and set air bag aside.
(The yellow connector can be simply levered up with a screwdriver from the back
of the air bag unit.)

Remove the four 19mm bolts holding the retaining ring to the steering wheel

Remove the horn retaining ring and torx bolts

Installation

Place the 2 torx bolts into position in the plastic hub

Place the retaining ring into position over the torx bolts, insert the 4 19mm bolts and tighten.

Reconnect the wiring connectors and refit the air bag

Tighten the torx bolts

Connect the batteryFinish Up

Check horn operation
Check air bag light comes on and goes off
Reset the clock
Reset the radio security code
Update the log


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04-28-2013, 06:27 PM

 

Thanks for this great DIY post. I just did the fix today and it literally took me less than 20 minutes to complete. Your instructions and pictures were an excellent aid.


I have a 1997 C4S with about 62k miles. At first my horn was going off when I did hard braking on the race track during DE days. Then it started to go off during regular road driving and I knew I needed to fix immediately.


I bought the horn retaining ring (993-347-088-01) at Pelican Parts for $86.25. The tools I had on hand.


My Torx bolts were really held on tight. An improvised extension to my Torx L-key and gentle pressure (counter clockwise) did the trick. The rest went smoothly.