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Hi Im David, The OD light functions for the transmission similiar to a check engine light for the engine. When the OD light is on it means there are fault codes stored in controller memory for the transmission. These codes must be retrieved using a scan tool with this capability to even give a point to begin diagnosis.
yes, you check do a continuity check of all the wiring of the affected systems. let me pull up some prints
i see that you did a continuity check, but did you check for a high resistance to ground on each wire?