Test C: Ecu Power Source Circuit

When the wireless door lock main switch is ON, battery voltage is applied to terminal +B or the wireless door lock ECU, causing the ECU to operate. When the wireless door lock main switch is off, battery voltage is not applied to terminal +B and the ECU does not operate.

Fig 1: ECU Power Source Circuit Diagnostic

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Fig 2: ECU Power Source Circuit Test (1 Of 2)

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Fig 3: ECU Power Source Circuit Test (2 Of 2)

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