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Passenger blinkers blinking fast

Tiny
BRENT METZ
  • MEMBER
  • 2003 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 300,000 MILES
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.
Sunday, November 8th, 2020 AT 4:54 PM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,913 POSTS
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
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Sunday, November 8th, 2020 AT 7:03 PM
Tiny
BRENT METZ
  • MEMBER
  • 4 POSTS
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?
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Monday, November 9th, 2020 AT 10:26 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,913 POSTS
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
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Monday, November 9th, 2020 AT 11:00 AM
Tiny
BRENT METZ
  • MEMBER
  • 4 POSTS
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.
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Monday, November 9th, 2020 AT 11:17 AM
Tiny
BRENT METZ
  • MEMBER
  • 4 POSTS
I could get a video if that would help at all.
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Monday, November 9th, 2020 AT 11:17 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,913 POSTS
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
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Monday, November 9th, 2020 AT 8:30 PM

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