Grand Cherokee 2WD V8-4.7L VIN J (2004)
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
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Terminals 1 and 2 brake sensor circuit
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Terminals 3 and 4 speed control circuit
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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.
