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2015 PIU Aux buttons

Discussion in 'Ford Explorer Police Interceptor Utility PIU' started by Eric Z, December 25, 2017.

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    1. Eric Z

      Eric Z Elite Explorer

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      If I understand correctly, the Aux switches on the steering wheel were set up to control various light options. I assume those switches were just used to activate relays that pulled in the high amp loads? Any idea as to what fuse locations were for what switch?? In other words, how does one figure out what power lead or location is energized by what switch? Would be neat to use those switches again, but there is a ton of wiring to trace......
       
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    3. billyfromhill

      billyfromhill New Member

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      See the upfitter manual. The four aux switches control switched grounds in the 16 pin vehicle signals harness under the center of the dash. The wire controls the ground side of the coil of a normal Bosch style automotive relay. DO NOT connect the ground side of you loads to the wires.

      AUX Button Light Wiring
       
    4. Trader0000

      Trader0000 Police Explorer for sale....needs paint Elite Explorer

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      There are no fuses for the aux buttons. They are controlled by a computer module.
       
    5. Eric Z

      Eric Z Elite Explorer

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      Ok thanks for the info. I find the info and think I know the connector in question and the table shows me pin and wire info, but.... Can you explain in more simple terms the power situation?? I had thought I would see +12volts at the connector pin, when that aux button was "on". I would then use that 12volts to activate a separate relay, but????? If I understand you... What I need is a "Bosch" style relay. To that I run a fused (at whatever level I need) power feed, to a power input on the relay and the power out goes to my load (lights). From the connector pin I run wire to the ground side of the relay and the lights have their own ground??
       
    6. Trader0000

      Trader0000 Police Explorer for sale....needs paint Elite Explorer

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      Yes, the AUX is part of the relay control circuit and you run your load (lights) with the power circuit side of the relay. The lights use their own separate positive source and ground.
      The AUX wire from the 14 pin connector completes the relay coil circuit.
       
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    7. billyfromhill

      billyfromhill New Member

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      When an AUX switch is off, you will have no signal on the wire. When an AUX switch is on, the wire corresponding to the switch is ground. If you test with a multimeter you should have continuity to ground when the AUX switches are on.

      A Bosch style relay is just a standard automotive SPST/SPDT relay.
      [​IMG]

      You would connect the AUX wire to pin 85 of the relay and B+ to pin 86. Your B+ for the load goes to pin 30 and your load connects to pin 87.

      [​IMG]

      GY-BN is one of the AUX switch wires in the 14 pin vehicle signals connector in this example.
       
    8. Eric Z

      Eric Z Elite Explorer

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      Thanks that helps clarify the wiring and I will post again when I get it all wired up. Nice to have people who can interpret the Ford Modifiers guide.
       

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