Front driver blinker and rear passenger blinker/brakes lights are not working

MATTHEW HUNTER CANTERBERRY

MEMBER
2011 BUICK REGAL
200,000 MILES

The front driver side blinker is not working. I replaced the bulb and still nothing. At the same time, the rear passenger side blinker/taillight also is not working. Replaced the bulb with it and nothing. Suggestions?

Thursday, August 6th, 2020 AT 8:25 PM

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

When you turn either side on, what happens? Does one light flash fast? Do any of the signals work?

Let me know. I ask because they are powered via the body control module (BCM). If one is working, we need to check at the module to see if power is being sent. They use different grounds, so that isn't the issue.

Let me know.
Joe

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Thursday, August 6th, 2020 AT 11:26 PM

MATTHEW HUNTER CANTERBERRY

MEMBER
2 POSTS

There is rapid blinking on the bulbs that do work, but nothing on the ones that are out.

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Friday, August 7th, 2020 AT 4:34 AM

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Okay, then we have an open circuit. What I need you to do is start at the light socket. Check to see if there is power to the socket. I attached two pics below from the wiring schematics. The first is for the right rear. Check the blue wire with a violet tracer for power when the signal is on.

Pic 2 shows the front. Check the blue wire with a white tracer for power. You will need to have a test light to do this.

Let me know if you have questions and what is found.

Joe

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