How-to: Locked Out Prevention Circuit

• +12volt Relay capable of NORMALLY CLOSED (N.C.) contacts.

• Silicon diode capable of handling +12volts (I used a 1N4001)

• Four wire taps

• Wire

• Zip-Ties

• Double Sticky Tape

Looking at the connectors on the back of the instrument cluster locate the far left connector.
Plugged into this connector is a WHITE W/ GREY DOTS wire. This is the Key Reminder Switch Wire.
My wire was already detached after doing the "Disable Door Chime" mod.
(NOTE: The door chime mod on my website is old, and also disables the courtesy light, disconnecting the above wire is the proper way to disable the door chime.)

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First I need to test this wire.
Indeed is has +12volts when there is a key in the ignition.
When the keys are removed this wire has no power.

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Next locate the connector at the far right.

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Remove this connector and look at it with the tab facing up.
The Door Ajar Switches are connected to the BLACK W/ BLUE STRIPE wire.
This wire is the middle wire near the tab.

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Remove this wire, and plug the connector back into the Instrument Cluster.

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Confirm that your Door Ajar Light no longer works.
Don't worry we will be putting this wire back, I only removed it to confirm I had the right wire.

Now we are ready to install our relay circuit.
Using double sticky tape I attached the relay to the back of the instrument cluster.

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I then connected the RED wire (This is the one with the diode) to the White w/ Silver.
And then connect the GREEN wire to the Black w/ Blue wire.
Try opening a door with the keys in the ignition, the relay should trip.
If not try reversing the RED and GREEN connections, and try again. (If that works you installed your diode backwards)

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Trim your GREEN wire to size, and using a tap attach the GREEN wire to the BLACK W/ BLUE STRIPE wire.
Make sure and re-install the Black w/blue wire back into the instrument cluster.

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Since I am leaving my Key Reminder Switch wire detached from the Instrument Cluster due to the door chime, I didn't need to use a tap.
Instead I simply stuck the wire into the connector and secured it with tape and zip-ties.
If you still want your door-chime, reconnect this wire to the instrument cluster and use a tap to attach to it.

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The relay connection is now complete.
Push the black wires behind the instrument cluster and down to the Door Lock Control Box.

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About ten seconds later I realized I had to move the relay due to the metal bracket.

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Next we need to go back down to the Door Lock Control Box, and our GREEN W/ RED STRIPE wire we left disconnected.

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Cut the Green w/ Red wire leaving enough wire on each end to attach our wire taps.
Also trim the black wire from the relay to size.

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Next attach one black wire to each end of the Green w/ Red wire.

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Re-install the Green w/ Red wire into the Door Lock Control Box.

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That's it!
Now if any car door is opened, and your keys are still in the ignition then, your door-lock buttons will not work.

Be aware if you do leave your keys in the ignition, exit the car, press the lock button, and walk away, your doors won't be locked!
But since the car makes a sound when you actualy press the lock button you should be able to tell something is wrong when you press the button.

Nice, I wish this existed before i got my compustar.

Very nice write up Zap, keep up the great work.

yeah sounds good...why not press the lock button on ur keys and then ur sure they are in your hand

NRRfrogmanP5 said:

yeah sounds good...why not press the lock button on ur keys and then ur sure they are in your hand

Click to expand...

Something I have not got into the habit of for some reason, it's automatic, I press Unlock, open the car door, press the lock, then get out, all in one motion.

moved to how-to

Great writeup as always man. Thanks..

My solution to this problem? The valet key is in my wallet, tucked into one of the credit card pockets. I have never had an instance where I have left both my keys and my wallet inside the car. (although now that I've said this, I probably will...)

Nice write up. If I didn't have a alarm remote that I always use I would definately use this. Only suggestion I have is to tell those who have no idea about relays where the wires are going to on it. Not everyone knows which is normally open or closed or if they need to use 87 or 87a......just a thought for those not electronicly inclined.

Nice write up. Great work.

Is the schematic still around? This would be a pretty handy mod to do.