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Thad in AR. 
Orange Level Access
Joined: 12 Sep 2009
Location: Arkansas
Points: 9653
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 Topic: Service 4wd light is on
Posted: 07 May 2022 at 3:19pm |
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On my 2000 GMC.
Has the push buttons on the dash for 4x4.
I was under it today. Unplugged the actuator and has 12v power to one wire.
Messed with the switches and it never changed. No other wire ever had power.
Pulled the switches. One wire had power. I pushed switches and no other wires showed power.
Do you suppose it’s the switches?
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
Points: 87623
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Posted: 07 May 2022 at 4:45pm |
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not 100% guarantee, but on a FORD, when you move the switch, the motor rotates and at the end of the travel IT HITS A SWITCH and tells the dash that it has completed the move... If it DOES NOT HIT THE SWITCH, i think you get the error... You might pull the motor and set on the floor , plugged in and see if it will ROTATE freely from the dash switch.
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Like them all, but love the "B"s.
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Thad in AR.
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Joined: 12 Sep 2009
Location: Arkansas
Points: 9653
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Posted: 07 May 2022 at 9:08pm |
 steve(ill) wrote:
not 100% guarantee, but on a FORD, when you move the switch, the motor rotates and at the end of the travel IT HITS A SWITCH and tells the dash that it has completed the move... If it DOES NOT HIT THE SWITCH, i think you get the error... You might pull the motor and set on the floor , plugged in and see if it will ROTATE freely from the dash switch. |
That will be next to try
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shameless dude
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Joined: 10 Apr 2017
Location: east NE
Points: 13607
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Posted: 07 May 2022 at 9:23pm |
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i haven't had it happen to me yet, but i've been told the switches in the GM's go bad alot.
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plummerscarin
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Joined: 22 Jun 2015
Location: ia
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Posted: 07 May 2022 at 10:40pm |
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Is this a thermal actuator? Remove actuator from housing to see if it extends as it warms up. I have no experience with the push button activation circuit. The ones I own are a lever on the floor but I do know these levers activate a switch on the transmission case.
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Thad in AR.
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Location: Arkansas
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Posted: 08 May 2022 at 5:50am |
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It will not lock in 4x4.
Don’t know if it’s switches, actuator or what?
Actuator is a 4 prong plug with power to one prong all the time.
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fixer1958
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Location: kansas
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Posted: 08 May 2022 at 6:39am |
Is it showing you have a ground at the switch and actuator
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Thad in AR.
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Posted: 08 May 2022 at 7:09am |
fixer1958 wrote:
Is it showing you have a ground at the switch and actuator
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Not sure?? I grounded to a bolt to see if I had power at each. Wouldn’t take long to see if there is hound at each. After some studying this morning, I believe I’m gonna order switches. It acted exactly like this last time they went out but it didn’t trigger the service 4x4 light that I recall. I read many instances where it did though this morning. These switches never last anyway so I think I need to order either way. Sadly this set ( auto parts store) have lasted 8 years or so. Longest of any so far.
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omahagreg
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Joined: 11 Sep 2009
Location: Omaha, Nebraska
Points: 2806
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Posted: 08 May 2022 at 4:22pm |
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My ‘96 chevy had the switch on the dash-wasn’t impressed! The owners manual stated you had to be moving to get into 4 low?!?! What if I’m stuck?
The service light was on, asked my mechanic to fix it! Said he would replace the dash switch but NO more! He had been working on a Suburban one time, following the prescribed testing and repairs-never got it to work! Guess the bill was at $1500 when the owner took it to the dealer! Said he never did hear was fixed it! Mine the dash switch fixed it!
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Greg Kroeker
1950 WD with wide front and Freeman trip loader
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omahagreg
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Location: Omaha, Nebraska
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Posted: 08 May 2022 at 4:24pm |
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My ‘05 Silverado has the mechanical lever on the floor! It allows me to get in low at a stand still! Sadly rust is not being kind to that one !
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Greg Kroeker
1950 WD with wide front and Freeman trip loader
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Riprock
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Joined: 13 Feb 2021
Location: Tennessee
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Posted: 10 May 2022 at 6:35pm |
South main Auto recently did 2 videos on these, slightly different but good troubleshooting.
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Coke-in-MN
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Joined: 12 Sep 2009
Location: Afton MN
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Posted: 13 May 2022 at 11:13am |
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Dash switch is a common problem on those vehicles , mine went bad in around 30,000 miles - one check is to see if you have action on the front actuator on the axle .
The transfer case actuator motor can also be a problem - that motor runs over $100 .
It has a round shaft with 2 flats in sided - later units have what looks like a TORX pattern .
I just had to rebuild my transfer case last year as pinion bearing on front axle locked up and smoked the clutch pack in transfer case . So new bearing, seal and crush sleeve in differential , then into transfer case to replace one bearing and the clutch pack .
Neighbor had dealer replace his problem with switch in dash $700 to get his truck out of shop . My full cost was under $200 but a lot of time involved
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Life lesson: If you’re being chased by a lion, you’re on a horse, to the left of you is a giraffe and on the right is a unicorn, what do you do? You stop drinking and get off the carousel.
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