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Old 09-18-2016, 10:59 AM   #1 (permalink)
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Angry 4 way flashers won't stop flashing

The 4 way flashers (on the dash and on the car) on my 2008 Suzuki Forenza begin to flash on their own. Mostly overnight, sometimes while driving. They eventually stop flashing, but then start again. It is not a steady flashing, once or twice every few seconds, then stops for a few seconds and then starts up again. I removed the fuse for the hazard lights (4-way flasher) and tested by turning on hazard lights (they obviously don't flash with the fuse out). However, the 4 ways will still turn on by themselves (and if left overnight, drain the battery). I've had the car to b repaired 5 times. They've replaced all of the fuses and took the dashboard apart but could not find anything wrong. I've tried disconnecting the battery for two weeks, but as soon as I reattached the battery, they started up again. Any ideas?
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Old 09-18-2016, 11:32 AM   #2 (permalink)
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As the hazard switch joins the left and right indicators together and puts power on from a permanent supply I'd be most suspicious of that.
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Old 09-18-2016, 01:56 PM   #3 (permalink)
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Thanks, I will take a look.

Last edited by fordem; 09-23-2016 at 05:32 AM. Reason: Remove quote
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Old 09-18-2016, 02:01 PM   #4 (permalink)
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More information, if your handy with a multimeter

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Old 09-18-2016, 04:06 PM   #5 (permalink)
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Thanks again. This should help a lot. I'm hoping that's the answer. Will let you know.

Last edited by fordem; 09-23-2016 at 05:31 AM. Reason: Remove quote
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Old 09-23-2016, 04:07 AM   #6 (permalink)
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Got the car back last night, I had the switch replaced. They checked all of the readings and everything checked out. This morning when I got up, the lights were flashing again. The repair shop has run out of ideas. Any other thoughts on what could be causing it?
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Old 09-25-2016, 07:09 AM   #7 (permalink)
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Sorry to hear that
I'm afraid I can't think of anything else that could cause those symptoms.
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Old 09-28-2016, 10:43 AM   #8 (permalink)
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Many times, these type of phantom electrical problems are due to a faulty ground-connection somewhere.
I would check the ground-wire on all turn-lamps.

One other possibility: On the schematic I see 2 connections to the Anti-theft Control Unit. I wonder what would happen if you disconnected these 2 wires, whilst all lights are flashing?
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Old 09-28-2016, 01:20 PM   #9 (permalink)
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Quote:
Originally Posted by Ford Prefect View Post
One other possibility: On the schematic I see 2 connections to the Anti-theft Control Unit. I wonder what would happen if you disconnected these 2 wires, whilst all lights are flashing?
Good call, well worth a try. The unit would join the indicator circuits together and he did say they weren't flashing steady like they would do if the hazards where actually on.
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Old 09-28-2016, 09:18 PM   #10 (permalink)
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Thanks so much. I will give these suggestions a try and let you know the outcome. The car is great except for this problem (which is debilitating since it drains the battery).
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