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Electric door locks not working

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Old 07-03-2011, 01:50 AM
Junior Member
Join Date: Jul 2011
Posts: 1
Question Electric door locks not working

just got a 1999 F150 and the door locks only work with a key.
both switches do nothing like no power, fuse has power but the switches do nothing, no noise no click nothing on both driver and passenger side,
also the alarm seems to be not working but the fuse has power and not blown.
the blue light does not come on.
what would make both door locks not work with switch and the alarm not work?
i just got the truck so do not know history..
can anyone help?
i hate taking to a dealer unless i have an idea what is wrong and what the cost will be.

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Old 07-03-2011, 02:17 AM
Senior Member
Join Date: Oct 2009
Location: Corona, Crazyfornia
Vehicle: 2003 ford f150
Posts: 2,358
Power door locks too!

Look at this post. SSCULLY (A very smart guy) gave me some good sustem diagrams for the door locks.

My issue was a weak battery. But a few days later showed up in a bad driver side switch. If you search power window switch repair it is very simular.

Good luck.
Love my box stock V-6
I believe in COMMON SENSE gun control
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Old 07-03-2011, 02:17 AM
Senior Member
Join Date: May 2011
Posts: 215
I had the same problem and I had to replace both actuator for the locks and they work now
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Old 12-24-2013, 07:38 PM
Join Date: Jan 2004
Location: LOCKNEY, TX
Vehicle: 1999 FORD F-150
Posts: 33
have the same problem with my '99, except the locks will click just sounds real weak and will not move door locks
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Old 12-24-2013, 11:41 PM
Senior Member
Join Date: Jun 2007
Location: Utah
Vehicle: 1999 Ford F-150 5.4
Posts: 5,431
The fail regular. Not all that easy to replace either.

1999 F-150 xlt 5.4 4x4
1971 Mach 351c 5 speed TKO600 Tremac-sold!
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Old 12-25-2013, 01:18 PM
Senior Member
Join Date: Jul 2002
Location: Lebanon, Missouri
Vehicle: 2000 Ford F150
Posts: 2,932
Mines been that way for years now, someday I'll get it fixed but it's not high on my to do list.
2000 F150 4x4 XLT 5.4L, 77 Series K&N, Gibson Super Sport Exhaust, Edge Evolution Programmer, Alpine DVD Player, 16x10 Chrome DC-1 Cepeks, 33" Nitto Terra Grapplers, Strobes, and on..
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Old 12-26-2013, 12:32 AM
Technical Article Contributor
Join Date: Oct 2005
Location: MI
Vehicle: 1998 Ford F150 5.4L 4X4
Posts: 25,636
Yea, mine aren't working now. I'll take them apart at some point. I believe something corrodes somewhere inside. Cleaning may solve the prob.
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Old 12-28-2013, 12:23 PM
JMC JMC is offline
Technical Article Contributor
Join Date: Dec 1997
Location: Windsor,Ontario,Canada
Vehicle: 2000 Ford F-150 4x4
Posts: 9,364
Send a message via ICQ to JMC
Disable the alarm and try the door locks.
Jean Marc Chartier

4.6 to 5.4 swap, M5OD w/ Hurst short throw, Warn XD9000i, OBX Long Tubes /w Cats, Troyer E-fans, P-1SC Procharger @15psi, Troyer tuned. ;)
Swap notes; http://www.f150online.com/forums/art...ml#post3570245
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Old 12-28-2013, 11:44 PM
Join Date: Oct 2013
Posts: 17
My driver side was not working either when I bought it. The issue was that I heard grinding so the switch was working.

There is a DC brushed motor that has gears attached to the motor shaft...that move a long piece plastic with gears that is attached to the lock mechanism via a long rod....gears (plastics) had worn out on mine.

My solution was to just add a metal wedge in there as to make the worn gears make better contact...been working ever since I bought the truck..since I registered here.

I also fixed my brothers on his truck...his the problem was the DC brushes where gone...needed a new motor or the whole thing new...i just replaced the brushes.
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