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Power door locks

Tiny
LEGGETTBILL
  • MEMBER
  • 2002 FORD F-150
Electrical problem
V8 Two Wheel Drive Automatic 80000 miles

I recently purchased this truck, the first 20 minutes the door locks worked fine. I did not recieve a key fob w/ purchase. I have to manualy lock and unlock all doors. I dont beieve that all actuators went out at the same time. I hope. Is it possible that the culprit is possibly a relay for the auto lock like when the vehicle is put in gear or starts to move forward. If so, please share all your knowledge and expertise on repair or replacement.
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Sunday, March 2nd, 2008 AT 3:10 PM

5 Replies

Tiny
FLEXY5
  • MECHANIC
  • 512 POSTS
What exactly do they do or not do?
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Sunday, March 2nd, 2008 AT 10:25 PM
Tiny
LEGGETTBILL
  • MEMBER
  • 2 POSTS
The locks do not respond when you press the lock or unlock switch on the door panels. Also I programmed a key fob yesterday, which does not work the locks either but will turn on interior lights and sound the horn. But in both cases there is a clicking sound coming from under the dash drivers side when I press the switch or use the the fob.
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Monday, March 3rd, 2008 AT 7:00 AM
Tiny
FLEXY5
  • MECHANIC
  • 512 POSTS
The problem sounds like it may be either a broken wire in the drivers door jam or the master switch assembly. I could also be the relay itself. The clicking you hear is the module activating the door lock relay, which means the signal is good from the switch to the module and from the module to the relay. Locate the door lock relay and test the relay. If the relay is good test power and grounds at the switch on the drivers door.
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Monday, March 3rd, 2008 AT 9:55 PM
Tiny
JUSTIN THOMPSON
  • MEMBER
  • 1 POST
I have the exact truck and the exact problem. I tested all locks and switches. Turned out to be the Vehicle security module. Its a white box up behind the fuse panel nearest fire wall. Installed new one everthing works great. Took the computer board out of the old one and it had a break int he copper wire in the board and it had lifted off the green pc board.
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Friday, October 13th, 2017 AT 7:29 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,878 POSTS
Great addition to this thread! Please feel free to help out whenever you are on the site :)

Cheers, Ken
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Monday, October 16th, 2017 AT 11:49 AM

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