Thread: W210 Should voltage readings at battery terminals be same as at CCU?
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Old 01-10-2015, 07:24 PM
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Graham Graham is offline
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Location: Ontario, Canada
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The climate control on a W210 always displays a voltage 0.6-0.7V lower than the actual battery voltage.

From what I recall, it is due to the presence of a diode in circuit. (That perhaps protects the ECU from the car voltage)
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