Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Reply
 
LinkBack Thread Tools Display Modes
Old 01-12-2010, 04:58 PM   #1
Registered User
 
jim_hoyland's Avatar
 
Join Date: Nov 2006
Location: Sunset Beach, CA
Posts: 275
Front Trunk Light- What's going on ?

I got a headache; the front trunk light was out. So I thought a simple bulb replacement was needed. To be sure, I took the bulb from the rear trunk-it works-and tested it in the front trunk. No Dice

Out comes the multimeter. The front trunk light plugs into a red and yellow wire. Tested them without the light and get 12 volts; yellow wire has continuity to ground; my conclusion is there is twelve volts to the light. When I plug the light back on, NADA. Interestingly, I do not get 12 volts at the light connectors either.

The light unit works fine with a battery and works fine in the rear trunk.

Anyone been down this road ? It doesn't make sense to me.

jim_hoyland is offline   Reply With Quote
Old 01-12-2010, 06:14 PM   #2
Porsche Purist
 
Paul's Avatar
 
Join Date: Aug 2003
Location: Wisconsin
Posts: 2,063
Garage
Probably the switch in the front hood latch, what year is your car?
__________________
1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster bought new. Installed used motor at 89k.
1987 924S . 2002 996TT. PST2
Owned and repaired Porsches since 1974. Have driven them all the way the Dr intended...
Paul is offline   Reply With Quote
Old 01-12-2010, 07:54 PM   #3
Registered User
 
jim_hoyland's Avatar
 
Join Date: Nov 2006
Location: Sunset Beach, CA
Posts: 275
It's a 1998 I thought it might be the switch originally too. But, the voltmeter shows 12 volts at the + red and - yellow wires that connect to the light.

I also tested a spare license plate light. NADA again. Everythig I see tells me the light should be working.....but, I'm missing something; what is it ?
jim_hoyland is offline   Reply With Quote
Old 01-13-2010, 02:58 AM   #4
Registered User
 
Join Date: May 2009
Location: Colorado Springs Colorado
Posts: 53
Mine is the exact same way. I have an 02
BoxsterS21 is offline   Reply With Quote
Old 01-13-2010, 06:32 AM   #5
Registered User
 
jim_hoyland's Avatar
 
Join Date: Nov 2006
Location: Sunset Beach, CA
Posts: 275
Searched the Renntech forum on this and didn't find anything other than lubricating the latch mechanism so that the light switch ( microswitch) works properly.

The switch must be working if the red and yellow wires read 12 volts; interestingly, if I use the cars ground instead of the yellow wire, the light will work.
And, the yellow wire showed continuity with the cars ground....

The Renntech forum indicated both front and rear come on together---don't know if this is true, but if it is true, could there be somthing else going on ? I'll revist this again today....

Last edited by jim_hoyland; 01-13-2010 at 03:16 PM.
jim_hoyland is offline   Reply With Quote
Old 01-13-2010, 02:11 PM   #6
Registered User
 
Join Date: Sep 2006
Location: California
Posts: 713
interested in this topic as well. Mine used to work fine, and now seems to be taking a break...
__________________
http://farm4.static.flickr.com/3420/...90927559_o.jpg

Some stuff for sale: M030 S 24mm front sway bar, M030 base 19.6mm rear sway bar, 996 GT3 OEM Porsche Motorsport front strut mounts monoball "camber plates"

WTB: looking for some 5-7mm spacers with extended bolts
chaudanova is offline   Reply With Quote
Old 01-13-2010, 03:15 PM   #7
Registered User
 
jim_hoyland's Avatar
 
Join Date: Nov 2006
Location: Sunset Beach, CA
Posts: 275
For those whose front trunk light is not working, I would like to know whether you get a 12 volt reading when the red and yellow wires are attached to a multimeter. The red is + and yellow is -; disconnect the light light unit from the plug to do the test. I get 12v
jim_hoyland is offline   Reply With Quote
Old 01-13-2010, 04:36 PM   #8
Porsche Purist
 
Paul's Avatar
 
Join Date: Aug 2003
Location: Wisconsin
Posts: 2,063
Garage
Guys you are reading a phantom voltage, probably due to a bad ground somewhere.

You need voltage and current to light a bulb.

Check the switch since it most likely provides the ground.
__________________
1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster bought new. Installed used motor at 89k.
1987 924S . 2002 996TT. PST2
Owned and repaired Porsches since 1974. Have driven them all the way the Dr intended...
Paul is offline   Reply With Quote
Old 01-13-2010, 04:39 PM   #9
Porsche Purist
 
Paul's Avatar
 
Join Date: Aug 2003
Location: Wisconsin
Posts: 2,063
Garage
What happens if you try to lock the car with the trunk open?
__________________
1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster bought new. Installed used motor at 89k.
1987 924S . 2002 996TT. PST2
Owned and repaired Porsches since 1974. Have driven them all the way the Dr intended...
Paul is offline   Reply With Quote
Old 01-13-2010, 08:18 PM   #10
Registered User
 
jim_hoyland's Avatar
 
Join Date: Nov 2006
Location: Sunset Beach, CA
Posts: 275
When the bulb is inserted and the red/yellow tested-No Voltage

I'll try locking the car with the trunk open tomorrow...
jim_hoyland is offline   Reply With Quote
Old 01-14-2010, 06:43 AM   #11
Registered User
 
Join Date: Jan 2009
Location: kansas
Posts: 447
Garage
My trunk and frunk lights come on separately. I pulled my frunk bulb a few weeks ago to hook up a batt. tender. I hope it comes back on?!? I was going to just "push in" the latch to make the bulb go out. I was afraid I might try to close the hood on the latch and damage it so I just pulled the bulb. Hummmm???

sean
SeanZ4 is offline   Reply With Quote
Old 01-14-2010, 08:56 AM   #12
Registered User
 
Join Date: Sep 2007
Location: CA
Posts: 83
Mine does not work as well. It's a 2000S
Where is the switch located?
__________________
2000 Boxster S
1984 Carrera
1976 912E

1997 E36 M3/4/5
http://i713.photobucket.com/albums/w...ygug/arial.jpg
gerrygug is offline   Reply With Quote
Old 01-14-2010, 09:38 AM   #13
Registered User
 
jim_hoyland's Avatar
 
Join Date: Nov 2006
Location: Sunset Beach, CA
Posts: 275
The microswitch is located within the latch assembly. If you do a search on the Renntech Form under 986 Boxster with the search words" front trunk", there is an article on how to replace just the microswitch. The latch assembly has to be removed to do this.
jim_hoyland is offline   Reply With Quote
Old 01-14-2010, 09:38 AM   #14
Registered User
 
Join Date: Jan 2009
Location: kansas
Posts: 447
Garage
I have a 2000 S as well. I believe it's in the front latch assmbly. When I was trying to decide as to whether to remove the bulb or not I was able to push the latch assmbly down and it turned the light off.

sean
SeanZ4 is offline   Reply With Quote
Old 01-14-2010, 07:10 PM   #15
Registered User
 
jim_hoyland's Avatar
 
Join Date: Nov 2006
Location: Sunset Beach, CA
Posts: 275
Paul:

Tried locking the car with the front trunk open; the doors lock like normal, nothing else I couls see or hear.

As tried locking with rear trunk open; same thing.
jim_hoyland is offline   Reply With Quote
Old 01-15-2010, 06:54 PM   #16
Porsche Purist
 
Paul's Avatar
 
Join Date: Aug 2003
Location: Wisconsin
Posts: 2,063
Garage
OK then your front trunk switch is bad since your alarm horn should have beeped when you locked the car with the trunk open.
__________________
1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster bought new. Installed used motor at 89k.
1987 924S . 2002 996TT. PST2
Owned and repaired Porsches since 1974. Have driven them all the way the Dr intended...

Last edited by Paul; 01-15-2010 at 07:46 PM.
Paul is offline   Reply With Quote
Old 01-15-2010, 07:33 PM   #17
Registered User
 
jim_hoyland's Avatar
 
Join Date: Nov 2006
Location: Sunset Beach, CA
Posts: 275
Paul,

Thanks for the explanation. Unfortunately, my horn doesn't always beep twice when everthing is shut; but I get the idea and tend to agree that it's the microswitch.

I didn't want to go off topic, but have to ask why my horn doesn't always beep after the lights flash twice. It might beep one out of ten or 20 times when locking.
jim_hoyland is offline   Reply With Quote
Old 01-15-2010, 07:41 PM   #18
Porsche Purist
 
Paul's Avatar
 
Join Date: Aug 2003
Location: Wisconsin
Posts: 2,063
Garage
It beeps only when something is not closed.

At least the following will cause the alarm horn to beep:

front trunk open
rear trunk open
door open
glove box lid open
Roof clam shell not closed

Some of your switches may be working intermittently.
__________________
1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster bought new. Installed used motor at 89k.
1987 924S . 2002 996TT. PST2
Owned and repaired Porsches since 1974. Have driven them all the way the Dr intended...

Last edited by Paul; 01-15-2010 at 07:50 PM.
Paul is offline   Reply With Quote
Old 01-16-2010, 07:04 AM   #19
Registered User
 
jim_hoyland's Avatar
 
Join Date: Nov 2006
Location: Sunset Beach, CA
Posts: 275
Didn't know that beeping results only fron an open trunk/door; so many cars beep when locked, I thought it was supposed to beep. I'll go back and read the owners manual. Thanks for the info-I learned something today !
jim_hoyland is offline   Reply With Quote
Old 02-10-2010, 01:36 PM   #20
Registered User
 
jim_hoyland's Avatar
 
Join Date: Nov 2006
Location: Sunset Beach, CA
Posts: 275
Thanks for the tips and info. I found a DIY on Renntech, ordered a replacement microswitch, from Suncoast and did the exchange. The front trunk light is back.

One question though: There are two cables entering the front trunk latch, one from the right-driver side-, and one lower from the left ( pass side ). The upper one from the right looks like its attached to the manual mechanism on the door sill.
What is the lowere cable about ??? Curious minds want to know

jim_hoyland is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 03:04 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page