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Old 04-12-2018, 09:07 AM   #1
Jriddle76
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Join Date: Feb 2016
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Remote Locks

I have a 2008 Explorer XLT with Remote Door Locks. I can reprogram the remote, it works once, but if the key is not in the ignition, the remote is useless. Why is that? Battery maybe? Locks work with button, and keypad but not with remote.

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Old 04-12-2018, 01:52 PM   #2
J_C
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I can think of no other reason it would only work once besides the battery being drained too low. I'd grab a multimeter, and a few-hundreds-ohms resistor as a load if you happened to have any of that resistance value, and measure the loaded voltage.

Assuming it's a CR2032 cell (IIRC that's what other remote model years use, not sure about the 2008), at full charge a CR2032 is around 3.2V and many devices won't work with them much under 2.9V, though some devices still work down to 2.0V but if it's anywhere near 2.0V, it needs replaced soon enough anyway so might a well go ahead and do so.

One other possibility with those is that there may be a rubber membrane behind each button made out of silicone rubber that weeps silicone oil out over time. That oil can foul the electrical contacts and you could try scrubbing the rubber pad with hot, strong detergent solution and a toothbrush and wipe it off the circuit board with a paper towel (just get the bulk of it off, no need to get it clean enough to eat off of).

If the switches are discrete little soldered down box types with their own button in the middle, try not to get water in, or shake excess water out if you do and wait a day for them to dry before putting the battery back in. The other type of switch on some is just traces on the circuit board and those can get wet but don't need to be to just wipe excess oil off of them with a paper towel.
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'98 Explorer XLT 4L SOHC 4WD
'14 Explorer XLT 3.5L NA AWD
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