Brake Light Switch: Testing and Inspection

Brake Lamp Switch Terminal Identification:

The brake lamp switch operation can be tested with an ohmmeter. The ohmmeter is used to check continuity between the pin terminals.

SWITCH CIRCUIT IDENTIFICATION
Terminals 1 and 2: brake sensor circuit
Terminals 3 and 4: speed control circuit equipped
Terminals 5 and 6: brake lamp circuit

NOTE: Disconnect switch harness before testing switch continuity.

With the switch plunger retracted, attach test leads to terminal pins 1 and 2. Replace switch if meter indicates no continuity.
With the switch plunger retracted, attach test leads to terminal pins 3 and 4. Replace switch if meter indicates no continuity.
With the switch plunger extended, attach test leads to terminal pins 5 and 6. Replace switch if meter indicates no continuity.