Turn signals and hazards not working

LIGHTLESS

MEMBER
2010 MAZDA 6
3.7L
V6
2WD
AUTOMATIC
115,000 MILES

Turn signals and hazards are suddenly not working. Fuses are fine. Where is the relay located?

Thursday, November 14th, 2019 AT 7:22 PM

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,883 POSTS

Hello,

It sounds like the BCM went out. To be sure here is a guide so you can check for power at the fuses (stop, hazard) and the instruction on how to replace the BCM as well. I also have the turn signal wiring diagrams so you can see how the system works.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

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Saturday, November 16th, 2019 AT 12:15 PM

LIGHTLESS

MEMBER
2 POSTS

Thanks for the help, Ken. I did a bit more research on the BCM and it looks like it's a common problem with this car (mostly due to water leaks).

Fuses are okay, but I'll have to replace the BCM. If I buy one used, will I have to reprogram it? If so, how can I avoid going to the dealership for this? I haven't found a concrete answer for my specific vehicle.

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Sunday, November 17th, 2019 AT 4:20 PM

KEN L

MASTER CERTIFIED MECHANIC
42,883 POSTS

Yes, reprogramming will need to be done but if you find a re-builder then can program it for you before they send it. They just need the VIN number. Let me know how it goes.

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Monday, November 18th, 2019 AT 11:03 AM