A truck's warning chime doesn't sound when the key is left in the ignition with the driver's door open. Using a wiring diagram, a technician determines that the circuit includes a door switch, ignition switch, and control module. What is the FIRST step in diagnosing this problem?
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✓ Correct answer: B. Test the door switch for proper operationThe first step should be to verify that the door switch is functioning correctly by checking if it shows continuity when the door is open. This is the logical starting point as it's one of the input sensors for the warning chime circuit.
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