# Need wiring diagram 99' Pontiac Grand Prix SE trunk light **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [March 5, 2023, 7:27pm UTC](https://community.cartalk.com/t/need-wiring-diagram-99-pontiac-grand-prix-se-trunk-light/189449 "2023-03-05T19:27:57Z")\ **Posts on this page:** 8\ **Page:** 3
**Author:** ![realrobd](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/realrobd/32/34389_2.png) [@realrobd](https://community.cartalk.com/u/realrobd)\ **Post date:** [March 7, 2023, 10:53pm UTC](https://community.cartalk.com/t/need-wiring-diagram-99-pontiac-grand-prix-se-trunk-light/189449/41 "2023-03-07T22:53:48Z")
No and correct. ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [March 7, 2023, 11:00pm UTC](https://community.cartalk.com/t/need-wiring-diagram-99-pontiac-grand-prix-se-trunk-light/189449/42 "2023-03-07T23:00:06Z")
Maybe whatever computer decides whether or not to turn on interior lighting doesn’t know whether it is day or night for some reason. Does your car automatically turn on headlights at night? ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [March 7, 2023, 11:08pm UTC](https://community.cartalk.com/t/need-wiring-diagram-99-pontiac-grand-prix-se-trunk-light/189449/43 "2023-03-07T23:08:44Z")
If your car has a door ajar switch malfunction, the interior lights might remain off until a door is opened. ---
**Author:** ![realrobd](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/realrobd/32/34389_2.png) [@realrobd](https://community.cartalk.com/u/realrobd)\ **Post date:** [March 7, 2023, 11:12pm UTC](https://community.cartalk.com/t/need-wiring-diagram-99-pontiac-grand-prix-se-trunk-light/189449/44 "2023-03-07T23:12:57Z")
Yes, it has daytime running lights and they operate as they should. ---
**Author:** ![realrobd](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/realrobd/32/34389_2.png) [@realrobd](https://community.cartalk.com/u/realrobd)\ **Post date:** [March 7, 2023, 11:14pm UTC](https://community.cartalk.com/t/need-wiring-diagram-99-pontiac-grand-prix-se-trunk-light/189449/45 "2023-03-07T23:14:02Z")
The time on is limited to 10 min if they are stuck on. As it stands, they shut off in 30 seconds as they should. ---
**Author:** ![realrobd](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/realrobd/32/34389_2.png) [@realrobd](https://community.cartalk.com/u/realrobd)\ **Post date:** [March 8, 2023, 6:34pm UTC](https://community.cartalk.com/t/need-wiring-diagram-99-pontiac-grand-prix-se-trunk-light/189449/46 "2023-03-08T18:34:55Z")
New discovery and this made me laugh… sorta. Thinking that the BCM may be having issues, I went looking for it to grab the number off of it. I found it and also found… a GM aftermarket keyless entry system installed. LOL After unplugging the aftermarket unit, I discovered that the trunk light is still only illuminated when the interior lights are on. Which makes sense seeing as the current BCU doesn’t have keyless entry and the only way to trigger the interior lights is by opening a door. As an aside to the trunk light issue, I wonder if I could swap the BCM for one with keyless entry and have a factory setup. Rock Auto has one for about $130. Not sure it’s worth it. ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [March 8, 2023, 9:32pm UTC](https://community.cartalk.com/t/need-wiring-diagram-99-pontiac-grand-prix-se-trunk-light/189449/47 "2023-03-08T21:32:35Z")
Oh my. With cars being computers on wheels these days, I guess we all have to expect this sort of incompatibility thing cropping up and biting us once in a while. Here’s a pretty easy, inexpensive option if you can accommodate having to press the button. > **[180 Lumen Rotating Magnetic LED Work Light](https://www.harborfreight.com/180-lumen-rotating-magnetic-led-work-light-63766.html)** > > Amazing deals on this 180 Lumen Magnetic Led Work Light at Harbor Freight. Quality tools & low prices. ---
**Author:** ![bing](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bing/32/4619_2.png) [@bing](https://community.cartalk.com/u/bing)\ **Post date:** [March 9, 2023, 1:04am UTC](https://community.cartalk.com/t/need-wiring-diagram-99-pontiac-grand-prix-se-trunk-light/189449/48 "2023-03-09T01:04:56Z")
Every car has a way to turn on the interior lights. Usually by rotating the dash light dimmer switch. I guess this switch would be one to tie into the supply wire without looking all over the place. As far as ordering a different computer my wife would just tell me to STOP already. [Previous page](https://community.cartalk.com/t/need-wiring-diagram-99-pontiac-grand-prix-se-trunk-light/189449.md?page=2)