Silverado 1500 - pinout for the BCM X6 connector

2021 CHEVROLET 1500

60 MILES • AUTOMATIC

JACK-ARRRDOR

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The BT Diesel Works AutoSync site lists a "surveillance mode" trigger option by switching the "BCM X6 (Pink/Purple) connector, pin 21" to ground. Do you have the full pinout diagram for that connector? And what would be the proper pin to fit that connector?

And are there any replacement switches for the dash push-buttons below the radio screen? I've got a two-position blank left of the auto-idle toggle switch. Specifically, I'd like to wire two toggles there, one that grounds the above pin to turn off all my lights, another to turn on some red exterior LED's for light-preserving night mode.

Jun 24, 2026 at 4:16 AM

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I would not recommend grounding a BCM pin until you verify the exact connector view and pin location from GM service information for your VIN, because the 2021 Silverado/Sierra BCM connectors can vary by trim, options, and body configuration.

For the switch, I would use a simple SPST on/off switch that grounds that one signal wire. One side of the switch goes to the BCM input wire, the other side goes to a clean chassis ground. Do not apply 12 volts to that circuit.

Here is the X6 wiring pin out. Check out the images (below). Let me know how it goes

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Jun 24, 2026 at 3:39 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.