RAM 3500 Truck 2WD V8-5.7L VIN D (2003)
Brake Light Switch: Testing and Inspection
Fig.2 Brake Lamp Switch Terminal Identification
The brake lamp switch can be tested with an ohm-meter The ohmmeter is used to check continuity between the pin terminals.
SWITCH CIRCUIT IDENTIFICATION
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Terminals 1 and 2 brake lamp circuit
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Terminals 3 and 4 RWAL/ABS module and Powertrain Control Module (PCM) circuit
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Terminals 5 and 6 speed control circuit
SWITCH CONTINUITY TEST
NOTE: Disconnect switch harness before testing switch continuity.
With switch plunger extended, attach test leads to pins 1 and 2 Replace switch if meter indicates no continuity
With switch plunger retracted, attach test leads to pins 3 and 4 Replace switch if meter indicates no continuity
With switch plunger retracted, attach test leads to pins 5 and 6 Replace switch if meter indicates no continuity