Under engine hood lamp timer
Drifting
Joined: Feb 2003
Posts: 1,761
Likes: 235
From: North Carolina
I was thinking the same thing.
The BCM looks for current draw to turn the lights back on. When you cycled the mirror light switch, the BCM turned the lights back on. Any electrical disturbance will start the timer over again.
Give it another try and see if the under hood light does go out after 10-15 minutes. Mine turns off after 12 minutes but some C5s do it sooner, some take longer.
Another thought. If something in the car is turning on and off (like your seat motors or lumbar pump motor), the timer will never turn the lights off.
Bill
Bill
The BCM looks for current draw to turn the lights back on. When you cycled the mirror light switch, the BCM turned the lights back on. Any electrical disturbance will start the timer over again.
Give it another try and see if the under hood light does go out after 10-15 minutes. Mine turns off after 12 minutes but some C5s do it sooner, some take longer.
Another thought. If something in the car is turning on and off (like your seat motors or lumbar pump motor), the timer will never turn the lights off.
Bill
Bill
When I installed a LED underhood light it would not shut off with the timer. In fact when the timer circuit kicked in, it actually went about 1/4 dimmer but not completely out. If I opened the car door it went back on 100% bright. I eventually soldered a very small miniature light in line with the LED into the circuit in the underhood light assembly. It has worked fine with that small additional load in the circuit. I'm thinking Clancy209 might have a LED in that housing. Just a hunch, it could be something completely different.
Last edited by MAC5; Mar 27, 2014 at 09:55 PM.
Thread Starter
Burning Brakes
Joined: Sep 2013
Posts: 969
Likes: 141
From: Staten island NY
I was thinking the same thing.
The BCM looks for current draw to turn the lights back on. When you cycled the mirror light switch, the BCM turned the lights back on. Any electrical disturbance will start the timer over again.
Give it another try and see if the under hood light does go out after 10-15 minutes. Mine turns off after 12 minutes but some C5s do it sooner, some take longer.
Another thought. If something in the car is turning on and off (like your seat motors or lumbar pump motor), the timer will never turn the lights off.
Bill
Bill
The BCM looks for current draw to turn the lights back on. When you cycled the mirror light switch, the BCM turned the lights back on. Any electrical disturbance will start the timer over again.
Give it another try and see if the under hood light does go out after 10-15 minutes. Mine turns off after 12 minutes but some C5s do it sooner, some take longer.
Another thought. If something in the car is turning on and off (like your seat motors or lumbar pump motor), the timer will never turn the lights off.
Bill
Bill
Drifting
Joined: Feb 2003
Posts: 1,761
Likes: 235
From: North Carolina
Yes, see my note in post #21 above.
Note: I did this about a year ago and cannot remember whether I inserted that small bulb in series or parallel with the led. Maybe someone will chime in with a recommended resistor value that will work.
Note: I did this about a year ago and cannot remember whether I inserted that small bulb in series or parallel with the led. Maybe someone will chime in with a recommended resistor value that will work.
Last edited by MAC5; Mar 28, 2014 at 07:59 PM.
Thread Starter
Burning Brakes
Joined: Sep 2013
Posts: 969
Likes: 141
From: Staten island NY
Thanks you might have solved my problem
Team Owner
Joined: Jul 2006
Posts: 22,187
Likes: 4,178
From: Kannapolis NC
That's the kind of information that could have helped get you a quick, correct answer.
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