The wiring harness that run the multifunction swith has broke. I took my column apart and soldered the wires back together for the mean time. I dont suggest tring to do that its not a good fix. i found your post looking for the harrness. If you disconnect the battery you disconnect the airbag system
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This isn't a shade tree job.Be sure ignition is on and press brake pedal to get it into park.....Normally it is the shift linkage inside the column or where it connects at the trans...You can disconnect linkage from trans and put it in park by hand ...However it is dangerous and I don't recommend it..If it is in the column you have to remove all the covers and steering wheel to get a good inspection..DONT NOT TRY THIS...Only a trained Tech.should..Air bag could kill you...If you don't have a choice disconnect battery before touching steering...Adjustable steering wheels are bad for this.....It would be safer to contact a good garage..
you need haynes repair manual with photos show you how to remove steering column.you can buy haynes repair manual at any auto parts stores.you can try go on line internet look up how to remove steering column on a 1999 chevrolet tahoe.
These trucks are known for bad multifuction switches. the switch that i talk of is the signal switch , the handle is the switch, it bolts to side of steering column . this switch controls the signals and the headlights and high /low beams. the other thing is the headlight switch connector, the connector some times goes bad and starts to melt or just comes out of the connector. you will need to remove the cover to steering column, the screws are located under the bottom cover in holes. remove cover and check connector and then test for power if you have power going into switch but not coming out then switch is bad.
the last thing is to make sure the bulbs are good , make sure the headlight bulbs are good , and also the driving light bulbs, test for power at the connectors to those lights to. You will need to do a little testing to find the problem.
Believe it or not there are some problems you should take to the dealer. It never was the gear box, its a defective steering column bushing. That problem had a factory notice and the dealer would have diagnosed it immediately an fixed it free parts +$40.install. Tahoes get that problem.
Same problem. The shaft they lubed is called the intemediate steering shaft. Not a safety issue according to GM. The shaft has to be removed and lubed using a kit and procedure from GM. Not a big deal to do but there are some precautions that need to be taken concerning the air bags/steering coil.