Park signal wire

[billyfromhill]

Does anybody know a good location to tap a park signal wire or fuse? I need to control a relay to turn off some lights automatically when the vehicle is shifted into park. Signal can either be 12V or ground, doesn't matter for my application.

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[CNJFF]

Looking through the '22 wiring diagrams, closest I found was circuit 17 off the BCM "CTRL MOD. - KEY INHIBIT AND PARK DETECT SWITCH RETURN", CDC74 (BU-GN). It runs between the BCM and steering column lock module.

No other info listed. Here's some insight from a 2015 Explorer diagnosis.

Hopefully someone else on here can determine if that's viable or would mess with the computer/etc if tapped into.

 

[billyfromhill]

So an update on this. I metered this wire where it connects to the BCM. It connects to pin 17 in the C2280D connector on the BCM. When the vehicle is in park this wire has battery voltage from fuse 4 on the BCM through the steering column lock module. The wire has battery voltage even when the ignition is off. This is illustrated on page 20-1 of the wiring diagrams. When in reverse, neutral, or drive the wire is pulled to ground by the BCM, as shown on page 13-37. I believe the steering column lock module prevents the key from being turned completely to the off position when the vehicle is not in park (key inhibit).

My plan is to tap this wire to trigger a relay when the vehicle is in park. I plan to run my tap wire via a diode and an inline fuse so nothing can backfeed into the BCM. The blue/green wire in the photo off to the side of the harness is the aforementioned wire at the BCM.

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