This is a rough one if youhave never taken apart the steering column before. the steering wheel has to come off and the air bags have to come off also. it would be easier to ttake it to someone to fix this
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Replace the multi-function switch in the steering column. The 3rd brake light is powered directly off the brake switch while the regular brake lights are wired thru the turn signal switch. Common problem
You don't need to remove the column off to replace the hazard switch.
1. Take a pair of neede nose pliers and just pull the old one out. 2. Lube up you new one and just slide it in. The part numbers for the hazard switch are: 15174447 (retails for $16.23) & 15177379 (retails for $18.42). You have to look for the bar code on the top of the turn signal (multifunction) switch. If the number is 26083635, 26083636, or there is no bar code use the 15174447 hazard switch. If the barcode number is 26090641, 26090642, 26096832, or 26096833 use the other hazard switch (15177379). Now these numbers came off of the recall that was for the 2000 & 2001 S/T trucks so they may not work back too far. But I know that one of those switches works back to 96 (and maybe 95). Thank you for using Fixya and this should take you about 5 min to replace. Good luck
We bought a 2000 Blazer in '02 and one day I noticed there were no brake lights, but the 3rd light on top worked fine. I did some research online and found out there was a recall on this problem due to the hazard switch on the column. I also found out if I wiggled the hazard switch a certain way, the brake lights worked. I was able to get by for awhile by wedging a 'widget' beside the hazard switch button and the hole in the column cover. This worked fine until someone would knock the widget out of place. I finally got around to having the switch replaced at a local dealer. All was fine until last week when I was told the brake lights were out again and I found out my hazard lights didn't work either. I changed out the switch assembly myself this time, and once I had it out I saw what happened. The brake light voltage comes in to the assembly on a white wire, and the first contact this goes through is on the hazard switch. In my case the contact had obviously overheated from the brake light current and melted the plastic holding the contact in place, thus breaking the circuit to the brakes. Either a poor design or too much current for the circuit to handle. Soooooo now I am in the process of replacing the four bulbs in the tail/brake light assembly with 3 watt Luxeon LED plug-in replacements. The current draw of the original bulbs was measured at 2.2 amps at 13.8 volts, times 4 bulbs makes about 8.8 amps that goes through the contact in the hazard switch whenever the brakes are stomped. The LED replacements draw .2 amp each, so times 4 will be .8 amp or less than 1/10th of the original equipment bulbs. These LED bulbs in my opinion are as bright or brighter than the original equipment and hopefully will help from burning out another switch assembly.. David