Okay, I found instructions for finding a bad ground wire that has paint under it and isn't grounding properly.
1. Locate the ground point for G19 and G20. This is located behind and close to the ABS/ESC unit, on the LH outward panel.
Using a 1/4-inch-drive ratchet, 14-inch extension and 10 mm flex/swivel socket, reach behind he ABS/ESC unit to remove the G19 †G20 ground bolt. You may need to insert your other hand over top of the ABS/ESC unit to guide the socket onto the bolt. The bolt used for G19 †G20 is a self-tapping screw which collects debris when first inserted.
Move the ground lug away from the threaded hole so that no debris will collect on or between the ground surfaces during the thread cleaning process. Clean the bolt threads with a stiff bristle brush. Do not use a wire wheel, as this can damage the bolt’s self-tapping capability. Reinstall the bolt fully without attaching the ground lug. Run the bolt in and out completely three times (without fully removing he bolt) in order to clean the body’s thread hole. Once again, completely remove the bolt and clean the threads with a stiff bristle brush. Used compressed air to remove any remaining debris from the threaded hole, body surface and the bolt’s threads. This is the technical bulletin for the abs, break light staying on.
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Saturday, December 7th, 2019 AT 9:21 AM