96 Targa interior light
#1
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Thread Starter
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my interior light is not getting power. The ground wires appear fine because if I run a hot to the light and use existing grounds it works. Fuse is good and other lights on the circuit (glove box light) are working.
I looked at the wiring diagram for the 96 targa/cabrio it does not show a relay. I searched the forums and saw talk about a relay for a power delay. But I can't find one.
Can anyone suggest troubleshooting.
I looked at the wiring diagram for the 96 targa/cabrio it does not show a relay. I searched the forums and saw talk about a relay for a power delay. But I can't find one.
Can anyone suggest troubleshooting.
#4
Three Wheelin'
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Also, what year is your car?
Edit - never mind. I see you clearly put the year in the title of the thread. I need more coffee.
See pic below from one of JDHertz11's TTs for an example of option M520.
![](https://cimg0.ibsrv.net/gimg/rennlist.com-vbulletin/1500x2000/img_0457_83620202cbdd5e5dd97e076e9b906e1751201708.jpg)
#6
Three Wheelin'
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Does your car have the M520 option?
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#8
Three Wheelin'
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I'm happy to help troubleshoot since my car works, but can't without knowing what path to take on the EWD.
#9
#11
Three Wheelin'
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For those without 520, the wiring looks really simple, based on the '96 wiring diagram.
There should be 3 wires going to the light:
#1 direct + from battery (through fuse 11)
#2 ground
#3 goes to the alarm unit
I can only guess that there is a switch on the light that will either:
1) Ground #1 to #2 if you want to manually activate the light at any time
2) Ground #1 to #3 if you want the car to control the light (door opening/closing)
3) Do not ground #1 at all, if you want to force the light off.
I'm with Grapeape, the switch is malfunctioning. To confirm, you could test all of this stuff with a multimeter in about 2 minutes.
To discover wire #1, test all for 12v
Then find #2, with doors closed, check for continuity to ground
The last one is #3. Verify continuity to ground when a door is opened.
Those tests would confirm that the wiring and alarm unit are working as expected, leaving only the switch as the problem.
There should be 3 wires going to the light:
#1 direct + from battery (through fuse 11)
#2 ground
#3 goes to the alarm unit
I can only guess that there is a switch on the light that will either:
1) Ground #1 to #2 if you want to manually activate the light at any time
2) Ground #1 to #3 if you want the car to control the light (door opening/closing)
3) Do not ground #1 at all, if you want to force the light off.
I'm with Grapeape, the switch is malfunctioning. To confirm, you could test all of this stuff with a multimeter in about 2 minutes.
To discover wire #1, test all for 12v
Then find #2, with doors closed, check for continuity to ground
The last one is #3. Verify continuity to ground when a door is opened.
Those tests would confirm that the wiring and alarm unit are working as expected, leaving only the switch as the problem.
#12
Rennlist Member
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Look at the tag on the inside of the frunk lid, or on the first page of your service manual. It will list "520", among the other option and other spec codes. I'll attach a pic of one of those tags on my brother's 993TT. I know this is an old post, but it was highly ranked for this subject and was directed here to find out more about this option on his car. You need to be careful when interpreting some of these codes because the "6" codes look a lot like "8"s. Stutcars has a good searchable list that says what they are here: https://www.stuttcars.com/technical/...des/993-96-98/
![](https://cimg5.ibsrv.net/gimg/rennlist.com-vbulletin/2000x1333/226290496_4789731551055311_60753983939011533_n_d77d87b3338b8c9f26a3a4c99e0eb0091a9e5765.jpg)