Turn signal problem

2013 FORD F-150
141,000 MILES • 5.0L • V8 • 4WD • AUTOMATIC
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DMHENT
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  • 1 POST
I put a new multi-function switch in because my wipers quit working properly. Now everything works properly except the turn signal. It works in lane change mode, flashes three times, but then stops. If I hold the handle it works, just not on its own. I thought it might be a bad switch so I got another one and same thing happens. Any suggestions?
Jun 6, 2019 at 2:11 PM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
Good afternoon,

The signals are controlled by the Body Control Module.

The serial data line is what controls it. You command the lights to come on and a signal is sent to the module which activates the lights according to your command.

I attached a diagram for you to view.

You will need an advanced scan tool to monitor the BCM outputs.

Roy

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Jun 6, 2019 at 2:43 PM
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BMDOUBLE
  • ✓ASE Certified Mechanic
  • 1,139 POSTS
  • ASE Certified Mechanic
Have the part number verified with your VIN number at a Ford dealership. There are more than one type and aftermarket manufacturers sometimes get it wrong or make a “one fits all” part.
Jun 24, 2019 at 7:23 PM
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