From: Theo Jenniskens [jenniskens@wxs.nl]
Sent: Saturday, April 12, 2003 3:41 AM
To: 928
Subject: [928] RE: other elec gremlin

-----Oorspronkelijk bericht-----
Van: Tony Harkin [mailto:v1uhoh@hotmail.com]
Verzonden: zaterdag 12 april 2003 6:15
Aan: 928
Onderwerp: [928] other elec gremlin

Noticed the other day when backing up with a large storefront behind me that
neither of my reverse lights work .  I assume these bulbs are on the lamps
check circuit.?  I dont have a fault showing.  The koinky dink in all this
is that my PRND32 lights have never work since ive owned the car.

Based on this, my guess is the switching/signal mechansim on the tranny is
bad? Any ideas? Where is this little switch?

thankya

Tony
1987 S4 Auto, silver/grey, Auto
http://members.rennlist.com/v1uhoh
http://www.p-caronline.com/directory/v1uhoh/
Las Vegas

Tony,
the reserse bulbs are not in the check circuit as far as I know. There
is a relay XXII that turns on the light thru a switch (I have M249,
but the M481 is a bit different). The relay is at the relay panel
(where else..) and it is triggered by the backuplight switch at the
tranny. This switch is next to the control-pressure arm and combined
with the device that blocks starting while tranny not in P or N. The
PRND32 is switched on the same assembly. It is very possible that is
is not powered at all since no lights work in the dash. The switch
connects directly to the dash.
Check if U24 is 12volt while in reverse. That should engage the relay.
If not, the problem may be a lack of 12 volt at the tranny switch. The
switch is powered via a 2 pin connector on the dash assembly. If the
connector is loose or has bad contact, you will have no reverse light
or gear indicator lights. So the problems mat very well be associated.
I've had loose contacts at the relay socket one time. On the other
hand..... bulbs could be bad. I have just 3 working bulbs (yet another
task) ;-)

Hope that helps....
regards,
Theo
'88 928s4 cherry red
The Netherlands
http://home.wxs.nl/~Jennit/Porsche.htm