wont go into 4lo or hi just blinks

[sierra99]

My 99 silverado lt has done the same thing....I read all of the post about the transfer actuator but I looked at the switch itself. Pull the switch and take it apart. Look closely at the solder joints in the back of the switch while pushing on any and all of the buttons. Mine had a hairline crack in the solder joint. I had the same symptoms. Now you can either replace the switch or get a soldering iron out and add/ resolder all of the joints. I resoldered all of my joints. Now all is working great. Try that..

[Chuck D. Bones]

Please enlighten me, how do I remove the switch assy? Without the shop manuals, I have no clue how to get the sw assy out and I'm afraid of breaking some expen$ive plastic piece. Mine is a 98 Suburban.

Thanks,

- Chuck

[sierra99]

This is how I got mine out of my 99 silverado Lt (newer body style)

To get the switch out do this:

1 put key in ignition turn to on position without starting the truck.
2 put truck in drive with the motor off
3 Making sure the truck has the parking brake set.
4 pull on the bezel surrounding the gauge cluster radio and ac controls.
5 tilt steering wheel all the way down
6 remove the free bezel
7 unsnap the 4wd switch

You should not need any tools

there are snaps every 6-8 inches or so on the bezel

[98Z]

I picked up another switch assembly from ebay and swapped it out. Nothing has changed. It's still screwed up and does just what it did before. I think my problems go deeper than a screwy switch

[RPerformance]

Does anyone have a fix on this??? if it is not the dash switch or the transfer case motor?

I have not had the codes scanned at this point.

We have noted that if the lights don't come on the switch, then turning the ignition on and off multiple times will finally trigger them. Is there a harness issue with these??? My neighbor is having the same problem on an Avalanche, so I can't believe this is a rare problem. For those of you that have fixed the issue, could you share it with rest of us!!!

[RPerformance]

still no fix????

[mroakdale]

remove push button switch from dash take it apart and look at solder joints on back of switch, I resolderd mine and it fixed my problem.

[mdharmon]

Bad solder joints on the selector switch module. To remove the switch you need to remove the trim. Put the emergency brake on. Tilt steering down. Put the drive selector as far down as it can go. You'll need the key in. Now pull the trim off. It snaps out easily.

The selector module will require a flat tip screw driver to remove it from the dash. Pull the two connectors off the back and make sure to gently release the retainer clips that keep them on the there or they will break off.

To open the selector module use tiny flat tip screw drivers. There are three retainer clips on each long side of the module. Get two on one side and then start on the other. You'll see what I mean when you get started. Don't worry about spring flying or parts.

Once apart look for the two rows of solder joints. To make this work right remove the older solder before putting on new solder. Reflowing the old solder will work but will require rework in the future.

Good luck this is a good fix, you can do it!

[fuller32]

Had the same problem check and see if the grounds are rusted that should do the trick. Took mine to the dealership and they fixed it.

[roccodawg]

Not sure if I'm barking up the wrong tree, but I have a similar problem and wonder if anyone has thoughts that will help. My vehicle is a
2005 Silverado 2500HD 4X4 Duramax with only 62,000 miles and has been a lightly driven, RARELY used 4X4 vehicle...maybe 5 times over the years to get out of mud while hunting. At any rate, here's my problem:

When I select the 4LO button, it just blinks continuously. When switching to 4HI, it works just fine, which is what use most anyway. Actually never had occasion to use 4LO, but I'd sure like for it to work if I need it. Don't want to spend a ton at dealer if anyone has helpful thoughts. Thanks,

[roccodawg]

Originally Posted by fuller32

Had the same problem check and see if the grounds are rusted that should do the trick. Took mine to the dealership and they fixed it.

What was the problem/cost?

[j cAT]

Originally Posted by roccodawg

What was the problem/cost?

even with no use of the 4wd the transfercase fluid needs replacing...tracII ,,,,blue fluid....

are you sure you are rolling very slowly,, when using the proper proceedure to engage LOW 4WD...