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First you need to have EBCM - electronic brake control module check for DTC'S - diagnostic trouble code's . If the light is on there is a code stored . I think most part stores can do this and for free . After you find out what code is stored , looking up that code in service repair information for diagnostic trouble shooting chart would be next step . There are a few codes too.
DTC C0035 or C0040
DTC C0045 or C0050
DTC C0110
DTC C0131
DTC C0161
DTC C0186
DTC C0196
DTC C0201
DTC C0240
DTC C0241 or P0856
DTC C0244 or P1689
DTC C0245
DTC C0283
DTC C0287
DTC C0290 or C0292
DTC C0455
DTC C0550
DTC C0558
Find the code do the diagnostic's , fix the problem , wiring issue's , a sensor , bad module ,what ever it is . The light will go out then . Here is a sample of code discription .
• DTC C0035 Left Front Wheel Speed Sensor Circuit
• DTC C0040 Right Front Wheel Speed Sensor Circuit
Are the brake lights the ONLY lights that do not work? Does the third (high mount) brake light work when you apply the brake pedal?
The Hummer H3 is basically a Chevy Trailblazer in Hummer clothing.. so the first place to look is the brake light fuse. If it is good, then check for power at the brake light switch mounted near the top of the brake pedal pivot area. Also be sure that the bulbs themselves are OK.
Brake light problem - if bulbs and fuses (#34 and #43 in rear fuse panel) are good, then only other possibility are the circuit boards where all the tail lights are located.
Noise coming from rear is the mode control actuator in the rear HVAC unit, it is trying to move a stuck blend door.
The body mounted brake lights, are on a different fuse than the upper light. Check fuse #12 a 25amp fuse in the fuse block under the hood on
the left fender. The upper light fuse #16 a 10amp fuse in the rear fuse
block, under the left side of the back seat. Hope this helps.
Open the full hatch. Pull down the weather strip near the rear dome light. There should be a wire with a connector in it. Disconnect it Close the full hatch.
Open just the window hatch. There is 1 screw on either side of the bulb housing.
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