Passenger blinkers blinking fast

2003 CHEVROLET TAHOE
300,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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BRENT METZ
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All three blinkers blink very fast about 3 times then quit. The front back and the mirror. I realize this usually means a bulb out but all three actually blink? Please help.
Nov 8, 2020 at 4:54 PM
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JACOBANDNICKOLAS
  • ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Hi,

The idea that it double times does indicate an open circuit (burnt bulb). Are you certain one of the lights assemblies doesn't have two bulbs for the signal, one working and one not? Compare it to the opposite side. See if there is anything different.

Let me know what you find.

Joe
Nov 8, 2020 at 7:03 PM
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BRENT METZ
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No it just has the one, I just recently bought the vehicle and replaced all the bulbs except the running lights. They all three just blink 3 times then nothing, so could it still be one of the bulbs like more resistance on that bulb? I guess what I'm asking is could the bulb still blink a couple times if it's bad?
Nov 9, 2020 at 10:26 AM
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JACOBANDNICKOLAS
  • ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Hi,

Anything is possible. It could be making contact and then lose it. However, when you say it blinks three times and then nothing, do they just totally turn off?

Joe
Nov 9, 2020 at 11:00 AM
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BRENT METZ
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Yes , sometimes they will blink little longer but the longer it blinks the faster as well. But normally three or four really fast blinks and then nothing. It stops to quick for me to get out and check on the outside , I have to have someone else stand in front to see if it blinks as well as the back, of course I can see the one in the mirror.
Nov 9, 2020 at 11:17 AM
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BRENT METZ
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I could get a video if that would help at all.
Nov 9, 2020 at 11:17 AM
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JACOBANDNICKOLAS
  • ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Hi,

I suspect the turn signal flasher module is bad. I say that simply because they work (fast) and then totally stop. What happens when the hazard lights are turned on?

I attached a couple of pics below showing the wiring schematic and where the module is located.

Let me know.
Joe
Nov 9, 2020 at 8:30 PM
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