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Old 09-12-2020, 05:20 PM   #1
knesek
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Member#: 508145
Join Date: Nov 2019
Vehicle:
2007 WRX Wagon
Satin Pearl White

Impreza WRX Turn signals stop working when I plug in my phone

Hi everyone,

In the middle of driving yesterday, my turn signals just stopped working. Nothing happened at all on the interior or exterior when I tried to turn them on.

I found that this only happened when my phone was plugged in to play music, and I could only get them to come back on by turning off the car, turning the key into the first position and turning the ac and stuff off, and then starting the car. It's been consistently doing exactly that since. Checked the fuse and it was fine, but replace anyways. No difference.

I drive a 2007 WRX Wagon. I have had the battery light on dim for a while now but haven't had any problems. I do have a glowshift boost gauge installed and that is the only time I've messed with the wiring recently, but that was a few months ago.

Any ideas whats going on and how to fix it?
Thanks
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Last edited by knesek; 09-12-2020 at 06:20 PM.
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Old 09-13-2020, 05:45 PM   #2
Cougar4
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Location: Anchorage, AK
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2001 LL Bean Outback
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Are you plugging your phone into a power jack or audio jack? I suspect that there is a grounding problem causing this to happen.

Last edited by Cougar4; 09-13-2020 at 05:59 PM.
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Old 09-14-2020, 10:47 AM   #3
knesek
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its plugged into the usb port on a kenworth radio. I'm not very familiar in the slightest with electrical stuff, anything I should check in specific? also thanks for the reply I really appreciate it
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Old 09-14-2020, 02:30 PM   #4
Cougar4
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2001 LL Bean Outback
Winestone

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I would like to know what the voltage is on the ground wire for the turn signal light, while the problem is happening, using the negative battery post as the reference point for the voltmeter. Can you do that test?
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Old 09-15-2020, 10:22 AM   #5
knesek
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2007 WRX Wagon
Satin Pearl White

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Sorry I'm so bad at this stuff, I don't know how to do that but I'd love to be able to.

If I'm using the negative battery post for one end, where would I put the other?

I found the electrical diagrams for my model if that helps at all




Last edited by knesek; 09-16-2020 at 11:09 AM.
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Old 09-15-2020, 12:26 PM   #6
Cougar4
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2001 LL Bean Outback
Winestone

Default

Performing the voltage test is really pretty simple. The common or black lead of the voltmeter is placed on the negative battery post and the main lead touches the ground wire of the turn signal light that is shown on the TURN-02 page. This is the black lead of the turn signal light. While the light is supposed to be working, there should be very little or no voltage on the black lead, because that lead should be at the same voltage potential as the negative battery post, zero volts. If there is voltage on that wire it means there is a bad connection to ground.

I was wondering also if the emergency flashers work while this trouble is happening?
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Old 09-15-2020, 12:28 PM   #7
knesek
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Satin Pearl White

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Great thank you for taking the time to explain it! I'll run the test as soon as I can.
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