Turn signals not working

ANTHONYTUANVU

MEMBER
2010 TOYOTA HIGHLANDER
175,000 MILES

One day the left turn signal would blink really fast, so I suspected a bad bulb on that side and sure enough, the rear signal bulb was not on while the front one was rapidly flashing. I checked the bulb, but it wasn't burnt or anything, but I decided to replace it with a new one anyways. To just test it out. With the new bulb, it still didn’t work and had the same issue. I then suspected the socket, so I tried using the socket and bulb from the right side that was working but it still did not work. I am not sure what it could possibly be at this point. Please help, thanks!

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

If the right side is working and the left front is, we either lost power or ground. I attached two pics below and highlighted two wires. One is the power supply to the left rear and the other is the ground for the bulb.

First, check to see if there is actually power to the yellow wire at the light socket when the signal is on. If there is, then I need you to confirm there is continuity to ground via the white wire with a black tracer. The ground has a junction behind the bumper on the left side of the vehicle. There, the ground is supplied for both left and right. However, the ground for the left only may have failed.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Try this and let me know the results or if you have other questions.

Take care,

Joe

See pics below.

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Thursday, March 3rd, 2022 AT 8:38 PM

ANTHONYTUANVU

MEMBER
2 POSTS

Hi! I’m about to check those two things today. If either were not getting power, what would be the fix for them? Also, is it something that I could do at home? Thanks so much!

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Sunday, March 6th, 2022 AT 7:13 AM

JACOBANDNICKOLAS