Get (+) Signal From (-) Door Trigger, Risk to BCM? 2022 Ford Bronco
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=147262
Printed Date: May 01, 2024 at 9:13 PM
Topic: Get (+) Signal From (-) Door Trigger, Risk to BCM? 2022 Ford Bronco
Posted By: kipling79
Subject: Get (+) Signal From (-) Door Trigger, Risk to BCM? 2022 Ford Bronco
Date Posted: February 16, 2022 at 8:27 AM
Hello, I have been searching for a solution for a while, and have always ended back on this forum for the best answers. While I do know that I can use a relay to convert (-) door triggers to (+) signals, but I am curious as to whether this is safe on my vehicle:
I will be obtaining a 2022 Bronco soon, and already have some electric steps that lower when the door on that side opens. The manufacturer uses a magnetic switch and adhesive magnet to determine when the door is open; this is crude and I do not like it. This I am looking for other options:
1) I have a Bosch style relay (80ohm closing resistance) for both sides, and the equipment necessary to tap the door trigger wires. I am a little scared to put this load on the trigger circuit which runs to the BCM. Am I being too cautious?
2) If #1 has any risk, I am considering solid state relays, assuming that they have less resistance (no coil). But am I forgetting other risks (reliability/shorting the BCM, etc).
3) I am also researching whether Compustar Pro remote starts have the ability to detect door openings via the T-harness and can also be programmed to provide 12v Accessory-out when detected (preferably an individual circuit for both driver and passenger side).
I plan on installing a Compustar eventually (for manual transmission RS), and this would be a clean solution.
If anyone has experience with one or more of these scenarios, I would greatly appreciate your input!
Edit: 2022 Ford Bronco, push to start with FOBs and keyless entry pad
Replies:
Posted By: catback
Date Posted: February 16, 2022 at 6:09 PM
Don't know about the new Bronco but a lot of new Fords have a non-traditional NC (Normally-Closed) door trigger setup and the door trigger wires are grounded when the doors are closed and open circuit when a given door is open.
Can't speak to risk. All I can say is thread carefully, factory warranty typically doesn't cover damage done by aftermarket equipment/modifications.
Posted By: i am an idiot
Date Posted: February 16, 2022 at 6:39 PM
The 21 has normally closed door triggers. I am sure the 22 does as well.
Left Front Door Trigger Green/Violet - N.C. BCM-Dash Fuse Box, blue 52 pin plug (J5-E), pin 33
Right Front Door Trigger White - N.C. BCM-Dash Fuse Box, blue 52 pin plug (J5-E), pin 21
Left Rear Door Trigger Green - N.C. BCM-Dash Fuse Box, blue 52 pin plug (J5-E), pin 46
Right Rear Door Trigger Yellow - N.C. BCM-Dash Fuse Box, blue 52 pin plug (J5-E), pin 19
All of the alarm manufacturers make a special module to install an alarm into these vehicles. They are called Normally Closed Door Trigger Module.
If you think the double stick tape makes the OEM thing crude, you may want to look into magnetic switches used for home security systems. You can at least mount them via 2 screws per.
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Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB
Posted By: kipling79
Date Posted: February 18, 2022 at 5:35 AM
catback wrote:
Don't know about the new Bronco but a lot of new Fords have a non-traditional NC (Normally-Closed) door trigger setup and the door trigger wires are grounded when the doors are closed and open circuit when a given door is open.
I appreciate the response and info. This NC trigger throws an extra hurdle into my plans. If it gets too complex, the magnet switches my grow on me. Lol
i am an idiot wrote:
The 21 has normally closed door triggers. I am sure the 22 does as well.
Left Front Door Trigger Green/Violet - N.C. BCM-Dash Fuse Box, blue 52 pin plug (J5-E), pin 33
Right Front Door Trigger White - N.C. BCM-Dash Fuse Box, blue 52 pin plug (J5-E), pin 21
Left Rear Door Trigger Green - N.C. BCM-Dash Fuse Box, blue 52 pin plug (J5-E), pin 46
Right Rear Door Trigger Yellow - N.C. BCM-Dash Fuse Box, blue 52 pin plug (J5-E), pin 19
All of the alarm manufacturers make a special module to install an alarm into these vehicles. They are called Normally Closed Door Trigger Module.
If you think the double stick tape makes the OEM thing crude, you may want to look into magnetic switches used for home security systems. You can at least mount them via 2 screws per.
This is great info. Thanks! I have a lot to think about now. The switches aren't horrible, and are much less visible than I imagined. I just hate using them when the vehicle already has triggers built-in. But, I might get over this OCD when the project becomes too daunting!
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