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Discussion Starter · #1 · (Edited)
UPDATE: Problem solved. See below original post.

Gang- I've been trying to chase down a problem with an aftermarket power lock setup that recently went kaput all the sudden. A few weeks ago, I loaded up the wife and child and headed out for a nice day at the park. Upon leaving, I locked the doors with the door switch and all was good. Arrived at destination and unlocked, all good still. Then, once we were unloaded and ready to head to the park, the locks were dead. Since then using the multimeter, I've found that the keyless entry and the door switches deliver 12v right to the wires that run to the actuators themselves. I have tested two of them, and the wires to them each get a 12v pulse like they're supposed to. The actuators will move with the lock if I operate the lock on the door manually, so they're not seized. I don't know the brand of the actuators.

Any ideas?

PROBLEM SOLVED: A buddy of mine who works at the parts counter at a dealership (non-Nissan) recommended I head to a local alarm shop and see if I can cull any information about what might have gone bad on my door locks. The guy told me it would be $35 (made-up price) for his guy to diagnose the problem plus parts and labor to fix the problem once found. Although it sounded fair, I decided to do some recon online and found a sh!t ton of my type of 2-wire, 12-volt DC door lock online for cheap - which is probably where the installer got them in the first place. I figured, for $5 per actuator shipped to my door, I could get one door lock, install it and try to diagnose the problem. So, the single lock actuator arrived Friday, and within 15 minutes, I had fixed one of the four locks and had everything back together.

Diagnosis: all four actuators must have suffered a voltage spike and all died together at once. The two front actuators were seized solid, the two rears had movement, but would not work on their own. That afternoon, I placed another order on eBay, this time for a set of four from the same seller. They arrived yesterday, and this morning, within 30 minutes, I had the other three changed out and all four door locks working as they should.

So, for less than the cost of the local shop to even look at it, and in less work time than it would take to drive one-way to the shady dealer for "warranty" work (not to mention days on end waiting for the truck to be fixed), I have figured it out and taken care of bizz. Plus, I can whoop open the door panels on all four and re-assemble them now in about 2 minutes, so I learned a lot about the truck, too.
 

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Discussion Starter · #3 ·
Ground. Great idea. I had hope for this suggestion and got to testing it as soon as I could today. However, when I tested the continuity for the ground connection on the driver's side actuator wire, it was good when the switch was activated. Ground, at least on that circuit, is not the problem.

Any other suggestions?
 

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it's plausible but highly unlikely that they all went kaput after the same number of cycles?

the only way to be sure is to remove and test one outside the truck from a power supply independent of the vehicle. That will be a final answer telling you if it's the units themselves or the lock circuit in the truck.
 

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UPDATE: Problem solved. See below original post.

Gang- I've been trying to chase down a problem with an aftermarket power lock setup that recently went kaput all the sudden. A few weeks ago, I loaded up the wife and child and headed out for a nice day at the park. Upon leaving, I locked the doors with the door switch and all was good. Arrived at destination and unlocked, all good still. Then, once we were unloaded and ready to head to the park, the locks were dead. Since then using the multimeter, I've found that the keyless entry and the door switches deliver 12v right to the wires that run to the actuators themselves. I have tested two of them, and the wires to them each get a 12v pulse like they're supposed to. The actuators will move with the lock if I operate the lock on the door manually, so they're not seized. I don't know the brand of the actuators.

Any ideas?

PROBLEM SOLVED: A buddy of mine who works at the parts counter at a dealership (non-Nissan) recommended I head to a local alarm shop and see if I can cull any information about what might have gone bad on my door locks. The guy told me it would be $35 (made-up price) for his guy to diagnose the problem plus parts and labor to fix the problem once found. Although it sounded fair, I decided to do some recon online and found a sh!t ton of my type of 2-wire, 12-volt DC door lock online for cheap - which is probably where the installer got them in the first place. I figured, for $5 per actuator shipped to my door, I could get one door lock, install it and try to diagnose the problem. So, the single lock actuator arrived Friday, and within 15 minutes, I had fixed one of the four locks and had everything back together.

Diagnosis: all four actuators must have suffered a voltage spike and all died together at once. The two front actuators were seized solid, the two rears had movement, but would not work on their own. That afternoon, I placed another order on eBay, this time for a set of four from the same seller. They arrived yesterday, and this morning, within 30 minutes, I had the other three changed out and all four door locks working as they should.

So, for less than the cost of the local shop to even look at it, and in less work time than it would take to drive one-way to the shady dealer for "warranty" work (not to mention days on end waiting for the truck to be fixed), I have figured it out and taken care of bizz. Plus, I can whoop open the door panels on all four and re-assemble them now in about 2 minutes, so I learned a lot about the truck, too.
Do you have a P/N or Link to the ebay page for these actuators?
 

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Discussion Starter · #7 ·
Do you have a P/N or Link to the ebay page for these actuators?
I searched "2-wire power door lock actuator" on eBay. The seller is "uneeksupply" and the actuators were shipped from SoCal, but there are literally hundreds of these actuators on eBay right now from many sellers. I ordered one single on Tuesday and it arrived Friday in the mail. Then I ordered a set of 4 Friday evening, and they arrived Monday (yesterday) in the mail, and I live in the SF Bay Area. I don't have part numbers for these, and there is no identifiable manufacturer markings on the actuators themselves.

If you are looking for more"reputable" ones, you can check out SPAL. They make door switches, motors and lock systems and have been in business since the 1950's. I may go that route if these crap out on me. SPAL's 2-wire actuators run about $10 a pop, according to their Web site.
 
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