courtesy light delay

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=42241
Printed Date: May 14, 2024 at 6:55 AM

Topic: courtesy light delay

Posted By: wolf.zero
Subject: courtesy light delay
Date Posted: November 04, 2004 at 3:16 PM

i wish to fit a delay to the interior light it has standard negative trigger from the door switch and a permanant positive supply.

any idea's or wiring diagrams would be appreciated thanks

Replies:

Posted By: audiopro111
Date Posted: November 04, 2004 at 7:06 PM

what kind of car is it year,make and model......

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AudioPro111

Posted By: wolf.zero
Date Posted: November 05, 2004 at 5:04 AM

the car is a 1989 porsche 944

the original interior light is a hella unit 1" X 3" with a 3 position switch (on-off-door trigger) negative triggered from the door switch.

Posted By: wolf.zero
Date Posted: November 07, 2004 at 4:33 PM

I FOUND THE FOLOWING SPECS FOR ANYBODY WISHING TO UPGRADE A NON DELAY INTERIOR LIGHT

Courtesy light extender

In essence, this circuit is a 15 to 20-second courtesy light extender for cars. It is activated in the usual way by opening a door but it also samples the negative lock/unlock signals from a car alarm or central locking and does two more things.

First, when an unlock signal is received, it turns on the courtesy light for 15-20 seconds before you open the door. Second, when a lock signal is received, it turns off the courtesy light immediately, with no fade-out. This is done to eliminate false triggering of the burglar alarm through current drain sensing.

When a car door is open or the unlock relay is activated, the 33ìF capacitor discharges through diode D1 and this keeps transistor Q1 turned off. This allows Q2 and Q3 to turn on and the courtesy lamp is activated.

When the door is closed, the courtesy lamps stay illuminated and the 33ìF electrolytic capacitor starts charging through the associated 1MÙ resistor. As the voltages rises, Q1 turns on slowly, turning off Q2 and Q3 which gradually fades out the courtesy lamp.

If a lock signal from the central locking system is received, relay 1 closes and charges the capacitor instantly, so the lamp turns off immediately.

Relays were used to interface to the central locking/alarm system as a safety feature, to provide isolation in case something goes wrong.

Posted By: samis
Date Posted: November 28, 2004 at 1:10 AM

That looks very good and I will try out what you have suggested.

How can you modify the circuit so that when you turn the IGN off the interior light comes on.

Also if the doors are closed and you turn the IGN on the interior light turns off. (also so that if the IGN is on that no delay is present if the door has been opened and then closed the light will go out once the door has been closed)

Thanks for your info.

Posted By: wolf.zero
Date Posted: November 28, 2004 at 1:27 PM

Samis to do both of the things you wish to do properly you will need to build a more complicated driver circuit using an ic chip like a 555 timer.

but it is posible using a couple of relays and making them positive triggered from the ignition instead of negative triggered from the c/locking.