Your reverse light wires are probably
rubbed thru and touching the wire
that activates the trunk release. remove
the reverse light bulbs and see if it does it again, or remove the fuse for the trunk release. Also have someone look at the
reverse lights while your pushing
the trunk button on the drivers door.
If yhey come on then you know the circuit
is shorting to power
Your reverse light wires are probably
rubbed thru and touching the wire
that activates the trunk release. remove
the reverse light bulbs and see if it does it again, or remove the fuse for the trunk release. Also have someone look at the
reverse lights while your pushing
the trunk button on the drivers door.
If yhey come on then you know the circuit
is shorting to power
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SOURCE: trunk problem
lol someone hot wired the trunk latch to the reverse switch, get someone to run the wire to the right place
SOURCE: my trunk opens when i put the car in reverse.
I would test the harness that is currently connected to the button, if you are not getting power you can trace the wire and see if there is a break in the line or if a fuse is blown. If there is power then you have a break in the line that leads to the component that releases the trunk lever or the component itself may be faulty.
Another option would be to remove the harness that is connected and plug in the other harness that is tucked away behind the dash. Ford supplies two harnesses, one to release the trunk without the key and the other harness is a security feature which needs the ignition to be on in order to pop the trunk. This prevents anyone from accessing your trunk without the key.
SOURCE: 2002 Mercury Grand Marquis. Backup lights won't work
I had the same problem and solved it. Follow the wire harness from the trunk lock located on the trunk lid to the trunk lid hinge torsion bar located on the Driver's side. You will see a electrical connector of wires (male to female snap in black plastic connection). I found a black wire had broken off with a clean cut. This was caused by opening and closing the trunk throughout the years which would bend that wire back and forth until it broke off as a cut. As a result since the reverse lights, trunk lights, rear license plate light and power trunk lock share the same switch integrated into the trunk lock, the open circuit(cut black wire) allows voltage to travel into the truck lock when you shift into reverse. Closing the loop or repair the wire will prevent that. After the repair, I used a strong tape to prevent the lower part of the wire harness to the black connector from moving when opening and closing the trunk.
SOURCE: How fix 2002 grand marquis trunk it pops open when
Just experienced the same problem. Found a wire had pulled out of the wiring harness connector that goes to the trunk release. The harness is located near the left hinge. The wires going to the harness go around the hinge. The connectors are difficult to seperate because you can't see the release. I wanted to unplug the connectors to see if the car could be driven without the trunk opening. The fix was to find the corresponding wire to the one that had pulled out, stripped the ends added a length of wire to allow me to connect the ends with wire nuts, black tape the wire nuts then join the connectors. Essentially I added am jumper to bypass the harness connectors. Works great. Someday I may look into a permanent fix but am confident this will last.
SOURCE: How do you stop your trunk from opening when you put your car in reverse?
Please see my answer for similar problem on 2002 Grand Marquis. The problem is with the harness connector near the left trunk hinge. A wire has pulled out. It can be fixed with wire nuts and electrical tape.
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