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Discussion Starter #1
Every now and then I?ll leave my truck running if I have to just run into the store quick, have to get my daughter from daycare, or some other quick stop?..usually just to keep the A/C or heat running, or if I have a lot of stops around town, it keeps me from having to start the truck 15 times a day.
It makes me nervous as hell though that someone?s going to jump in and drive off with my truck?.so most of the time I just shut it off and take the keys.

I was wondering?.is there any kind of simple wiring mod you could do with an upfitter switch that would kill the truck if someone jumped in and hit the brake pedal? Either where you could turn the switch on and it would allow you to turn the truck off and remove the key, but would keep it running as long as the switch was on, and you didn?t hit the brake pedal? Or maybe some other way to wire it in where you left the key in the ignition, but if you hit the brake pedal it would kill the motor until you turned the switch off and restarted it?

Just something that would be a simple way to prevent someone from jumping in a running truck and being able to drive off. I would think that if someone knew the wiring schematics and PCM good enough, they could come up with something
 

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This could be easily accomplished using two Bosch type relays to interrupt the PCM power circuit when the brake pedal is depressed and could be enabled by turning on one of the upfitter switches. Since the brake pedal needs to be depressed to get the truck out of park it would thwart a theft attempt by cutting off the engine... interesting concept. The only problem would be if a would be thief were to turn off the switch (for whatever reason) the vehicle would then ne able to be driven off. Small detail however.
 

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Hi. I’m wondering if you’ve found a solution? I posted a similar question the other day but haven’t received any good info.
 

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Discussion Starter #4
Nope...I've never really got any good details on how to do it.
 

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So what would you like? We can choose a circuit to shut down and find an easy place to access a section to splice then draw up an electrical schematic and then search and source the relays, connectors, some wire and splice connectors? Of course we also need to visit the Ford Truck BBA website to download the bulletin on the Upfitter Switches and Customer Access circuits.
 

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Your best bet is to shut the truck off. There is a safety reason for this. If you continue to do this they will eventually steal your truck. Not sure if you can lock the doors and use the keypad to open the doors with the truck running.
 

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Discussion Starter #7
So what would you like? We can choose a circuit to shut down and find an easy place to access a section to splice then draw up an electrical schematic and then search and source the relays, connectors, some wire and splice connectors? Of course we also need to visit the Ford Truck BBA website to download the bulletin on the Upfitter Switches and Customer Access circuits.

That's really all I'm looking for. What circuit can I interupt that would either kill the truck if someone pressed the brake pedal down in order to shift the transmission out of park. Or, not allow the transmission to shift out of park in the first place. Is there a solenoid in the transmission that gets a signal from the brake pedal switch that tells it that the brake pedal is depressed, then it will activate the solenoid and let the transmission shift? If so, could you interrupt the brake pedal switch? Any other ideas?



I don't need it spoon fed to me bit by bit........if I could just find the best circuit to interrupt, everything else will be easy.
 

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That's really all I'm looking for. What circuit can I interupt that would either kill the truck if someone pressed the brake pedal down in order to shift the transmission out of park. Or, not allow the transmission to shift out of park in the first place. Is there a solenoid in the transmission that gets a signal from the brake pedal switch that tells it that the brake pedal is depressed, then it will activate the solenoid and let the transmission shift? If so, could you interrupt the brake pedal switch? Any other ideas?

I don't need it spoon fed to me bit by bit........if I could just find the best circuit to interrupt, everything else will be easy.

Okay, using the truck in your signature, 2005 Soooper Doooody, you could indeed interrupt the interlock circuit. Find the brake pedal position switch and identify the red wire with the light green tracer. Interrupting that circuit will disable the Brake Shift Interlock. While this could be defeated by crawling under the truck and disconnecting the shift cable I cant see someone quickly figuring that out in the excitement of an attempted theft. Also, doing this instead of shutting the engine off will not create the possibility that your engine will cut out while driving should your modification fail. Use a 5-pole Bosch relay and connect the cut wire to the NORMALLY CLOSED leads of the relay and the interlock will work normally. When you energize the relay with an upfitter switch for example, the relay will open the circuit rendering the shift interlock inoperative. Let us know how you make out!
 

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Discussion Starter #9
Okay, using the truck in your signature, 2005 Soooper Doooody, you could indeed interrupt the interlock circuit. Find the brake pedal position switch and identify the red wire with the light green tracer. Interrupting that circuit will disable the Brake Shift Interlock. While this could be defeated by crawling under the truck and disconnecting the shift cable I cant see someone quickly figuring that out in the excitement of an attempted theft. Also, doing this instead of shutting the engine off will not create the possibility that your engine will cut out while driving should your modification fail. Use a 5-pole Bosch relay and connect the cut wire to the NORMALLY CLOSED leads of the relay and the interlock will work normally. When you energize the relay with an upfitter switch for example, the relay will open the circuit rendering the shift interlock inoperative. Let us know how you make out!

Thanks for the info. As soon as it gets above freezing out in my shop, I might trying wiring up one of my upfitter switches like that. I think that would be a nice anda simple secirity feature .


Thanks again.
 
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