Turn signal stopped working. Stumped.

[TavisB]

Noticed today driving home from work that I was getting a fast flash on my right turn signal. When I got home everything was working, no lights out. I have Oracle flush mounts, and I read that some people had trouble with corrosion so I pulled it out and the connector for the resistor def had some corrosion. I cleaned it up and went to test it out, and now I'm not getting any turn signal at all. I tested at my trailer wiring and nothing. Tried the OEM tail light and nothing. Tail/brake works. Other side turn works. Just not the right rear turn.

Halp.

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[Dlars99]

I just ordered a set of the flush mounts. Where are you seeing corrosion? And thank you in advance.

 

[TavisB]

I just ordered a set of the flush mounts. Where are you seeing corrosion? And thank you in advance.

The connector for the resistor (for non LED Broncos) is not sealed. If you have this one, put some dielectric grease on it (or maybe even cut it out and use a better connector).

 

[Dlars99]

Will do thank you!

 

[TavisB]

Is this something I need to reset in Forscan? Maybe I shorted something?

 

[DefNotBuddyLee]

Did you take it to a shop that primarily handles BMWs? They likely disabled as that is standard SOP for any BMW on the road.

Did you double check the connector after cleaning? Sounds like it may not be seated properly after you cleaned the corrosion and worth a second look.

 

[TavisB]

Definitely a short issue. Hooked up Forscan and saw it was disabled due to a short. Unhooked my trailer wiring pigtail and it went away. I'll dig into it more tomorrow.

 

[BadlandsA51]

Definitely a short issue. Hooked up Forscan and saw it was disabled due to a short. Unhooked my trailer wiring pigtail and it went away. I'll dig into it more tomorrow.

If the Body Control Module has detected a short too many times, it may need to be replaced. There should be DTCs, if problem remains after codes are cleared, it’ll need a BCM.

 

[TavisB]

Ok. Checked it out a little more today. I couldn't find a short in any of my wiring or in the harness for the tail light.

I think the code clearing when I removed the trailer wiring was just coincidence.

When I was poking around today the code came back with nothing plugged in at all.

I replaced the Oracle LED tail with the OEM, and today eventually the code went away and the fast flashing stopped and I had a turn signal again. Hooking the trailer pig-tail back up did not cause any issue and it was still working.

So...new question.

Could just having the tail light unhooked trigger the code I was getting? I wasn't having that issue until I started unhooking everything to check the resistor.

I was getting B12848 Right Rear Turn Indicator
Short to ground

I'm used to diagnosing this stuff with a multimeter and spare fuses. This modern stuff is new for me lol.

 

[Brian_B]

Unhooking it won't give a Short to Ground error code.

Now - if you unhooked it and accidently arc welded it to the chassis - maybe.

Just unhooking would give an Open or Failed Bulb error code - whatever the code it would throw would be called.

 

[TavisB]

Guess I'll just put the OEM tails back in and get ready to take it to the dealership yet again. .

 

[Ford Motor Company]

Noticed today driving home from work that I was getting a fast flash on my right turn signal. When I got home everything was working, no lights out. I have Oracle flush mounts, and I read that some people had trouble with corrosion so I pulled it out and the connector for the resistor def had some corrosion. I cleaned it up and went to test it out, and now I'm not getting any turn signal at all. I tested at my trailer wiring and nothing. Tried the OEM tail light and nothing. Tail/brake works. Other side turn works. Just not the right rear turn.

Halp.

Good afternoon, Tavis! I would be glad to help you out with these turn signal concerns if you are still in need of assistance. Just shoot us a PM with your VIN and dealer name/location, and I'll get right on it. To send a private message, just click on our username and select "Start Conversation". Thank you!

 

[TavisB]

I ended up getting a similar resistor from Amazon and cut the old one out and redid the wiring with a better connector. Everything is working properly ATM. I'll keep an eye on it but hopefully the short was just me being sloppy with the probes.

The original resistor was what failed. I'll probably reach out to Oracle and see what they say.

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