Doors wont unlock

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bishop10

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When I hit the unlock button the driver door will unlock, the passenger door will unlock 80% of the time, the rear door behind driver will unlock 50% of the time and the rear passenger door has stopped unlocking all together. If the unlock button is hit several times it sounds as if the power is going out.
Anyone know what the problem is and how I can fix it?...99 expedition
 

stamp11127

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I would check for power at each of the door solenoids that are giving trouble. While in the doors I would also lube the mechanisms.
Check the voltage with a decent meter not one of the "el cheapos" at HF. The polarity of the electrical feed changes(reverses) for lock/unlock.
 
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