Brake Light Switch: Testing and Inspection

Brake lamp switch operation can be tested with an ohmmeter. The ohmmeter is used to check continuity between the pin terminals at different plunger positions.

Switch Circuit Identification
- Terminals 1 and 2: brake sensor circuit
- Terminals 3 and 4: speed control circuit
- Terminals 5 and 6: brake lamp circuit

Switch Continuity Test

NOTE: Disconnect switch harness before testing continuity.

With the switch plunger retracted, attach the test leads to terminal pins 1 and 2. Replace switch if meter indicates no continuity.

With the switch plunger retracted, attach the test leads to terminal pins 3 and 4. Replace switch if meter indicates no continuity.

With the switch plunger extended, attach the test leads to terminal pins 5 and 6. Replace switch if meter indicates no continuity.