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Circuit/System Testing: Notes

WARNING: This page is about a different car, the 2018 Buick Regal TourX and 2018 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

Use the schematics and connector end views to identify the device's ground, B+, ignition, and serial data circuit terminals. For E13LA Headlamp Assembly - Left, use connector end view for X110 Body Harness to Left Headlamp Harness. For E13RA Headlamp Assembly - Right, use connector end view for X120 Body Harness to Right Headlamp Harness.

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