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Steve, disconnecting either coolant or washer sensors has no effect on the warning lamp. It remains on.
Both sensors are new from MB . The voltage on the Brown/Blue wire is 8.46 vdc and 0.085 vdc on the Brown wire and 0.0056 ohms on the Brown wire to ground, measured at the plug connectors or at a peiced point down stream.
I think the 'black electrical tape' idea is workable !!
dk
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