Rear Locker not engaging - no warning lights

[H32NV]

Reloader noticed that on poison spider, my rear locker was not working. The amber led on the switch cluster lights up solid like it is supposed to. I verified that there is 12V being delivered to the connector at the end of the cable harness at the rear diff, no CEL's/messages on the DIP. Does this mean it is likely internal? Any common problems with the rear diff e-locking unit?

Thank you,

 

[atvspeed4]

It is most likely the locking pins are worn out and rounded. This causes them to slip over the slots they lock into. This is very common. Rebuild kit is about $170 if I remember correctly. Only other issue I have run into is the retaining tab for the magnet breaks and spins the magnet which causes it to break the wiring. Again, part can be ordered to rebuild.

 

[4speedfunk]

How are you checking it? Make sure you actually spin the diff...it does not instantly engage. The Eaton (factory GM) requires some rotation to engage. Also it ratchets (momentarily disengages) when you change direction. Using an Eaton requires you to plan ahead somewhat when wheeling. It needs about ten feet to fully lock...every time you push the button or change direction.
Mashing the throttle during this transitional phase will certainly round off the pins. There's a great video on YouTube that shows one being operated with the cover off. Once you see it in action, you'll see the transitional delay and it will make more sense.


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[H32NV]

thank you for the replies. I too have noticed that you have to roll ten feet or so in either direction to actually feel it engage, and have heard the skips. Is the service something that is easily done at home or is someone going to have to re-shim it/etc? I usually leave shimming to people that do this 8 hours a day, but if I can fix it with a socket set and a puller than I might have a go at it...

thoughts??

 

[alrock]

If the diff's never been pulled or rebuilt, I'd leave it to a shop. The tolerances could have changed and different shims may be needed. However, I'm not an expert in this area so others - the ones much smarter than me - may say otherwise.

 

[Guerrero]

I would start with simple things. I have a similar problem in my 2006 H3. I crawl under the hummer, dissengage the connection to rear locker and clean it very well with electronic cleaner spray.

Once i do that, system works again perfectly. Try that, is fast.

Hope you resolve the issue. Guerrero