"service 4wd" light on dash Help.
#21
TECH Addict
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Yes, it was the switch on the dash. I think it started working on its own again for a while, but I eventually had to replace it. Each button changes the resistance through the switch and causes the TCCM to command the various TC motor/encoder positions. If the commanded position on the Tech 2 does not change when you press the switches, then the switch is likely bad. If it does change, then problem is in another component. Not that we all have Tech 2s.
#22
TECH Addict
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I've had the same probs on & off for a while. Had the system check under warranty last yr and they said it was the sensor and all good...like usual dealer needs to work on it 3-4x before they figure it out - I'm guessing its the switch...DrX...how hard is it to replace the switch? Is it the whole 4 button unit or just 1?
Set park brake
Turn key to run position
Put shifter in 1st and tilt wheel all the way down
Pull off dash bezel
Release tabs that hold the module in place
Unplug module
Repeat in reverse order to install new module.
#23
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Join Date: May 2010
Location: Dallas Texas
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In my experience on the few vehicles I have seen with including mine it ended up being the connector going into the back of the switch. For some reason the wire crimps going into the connectors come loose. Its easy to check just pull the switch out of the dash with the power on and wiggle the wires. I pulled mine apart and re-crimped it and no problems since.
#24
old thread, but im having similar issues.
with my 03 sierra, upon engine start, the truck will be in either 4 low, 4 high, auto 4x or neutral. it was doing this months ago, but just went away. now its back. i have a predator sport hand held, i should be able to scan for codes. until then, any ideas ? not lifted, not modified other than intake and my hand held "tuner".
with my 03 sierra, upon engine start, the truck will be in either 4 low, 4 high, auto 4x or neutral. it was doing this months ago, but just went away. now its back. i have a predator sport hand held, i should be able to scan for codes. until then, any ideas ? not lifted, not modified other than intake and my hand held "tuner".
#25
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Join Date: Oct 2010
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Just came across this thread and wanted to give a little tip for future usres. If you have a service 4x4 light on your dash it is typically your push button 4x4 located on your dash. What happens is there are a few contacts that have cracked solder. It is very simple to fix. Just remove the buttons and look for the cracked solder and resolder it. No need for additional solder just heat up the old stuff. I forget the sequence of the fix but it's pretty easy. Better than spending 80 bucks or so.
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