Turn Signal Circuit Advice (2008 Mazda 5)

[Mase]

Originally I was having an issue with my hazard light fuse blowing whenever I unlocked my doors with the key fob, you can see that thread here.

Now my left signals work, but my right signals don’t – none of them. When I select the right turn on the turn switch I get a rapid flashing of the instrument cluster indicator as if one or more of the bulbs were bad, however, all of the bulbs are good. Periodically, the instrument cluster indicator won’t flash at all.

I was able to source a circuit diagram from a friend’s ProDemand account which I have attached. I have done my best to trace the harness and look for any obvious signs of a short to ground, I have also inspected all of the harness connections and have not turned up any evidence. That has lead me to believe it is either a problem with the turn switch (combination switch) or the Body Control Module (BCM). I have more or less ruled out the turn switch because the hazard switch is unable to activate the signals on the right side either and according to the diagram it should act independently of the turn switch, and shares a common ground for both left and right signals.

If someone who is more skilled than I can look at the diagram and confirm if I’m correct in suspecting the BCM is the problem, or if it is something else that would be great!

Attachments:

• M5Circuitpdf.jpg

Topic

[college man]

Test for power from the switch to the bcm Then check for power out until you loose the power.
Thats where you dig.

[Brian]

There is also a chance of a corroded bulb socket. Undo each fixture as if you were going to change a bulb, then pull it out and look at those connections and the harness leading to it. Sometimes the harness can be missing a bit of insulation and ground out against the body.

[Author]

Replies