Question

1. a technician uses an ohmmeter to test the four - pin brake light switch in the illustration for continuity. when the plunger is depressed, two connector pins have continuity, and two are open. technician a says this is normal. technician b says this brake switch has one no (normally open) and one nc (normally closed) connection. who is correct?

a. technician a
b. technician b
c. both a and b
d. neither a or b

Explanation:

1. Analyze Brake Switch Operation: A four - pin brake switch typically has one normally open (NO) and one normally closed (NC) circuit. When the plunger is depressed (brake applied), the NC circuit opens and the NO circuit closes. So, having two pins with continuity and two open when depressed is normal (matches Technician A's statement), and the switch has one NO and one NC connection (matches Technician B's statement).
2. Evaluate Technicians' Statements: Both Technician A (stating the continuity result is normal) and Technician B (stating the switch has one NO and one NC connection) are correct about the four - pin brake switch's operation.

Answer:

C. Both A and B