RAM 2500 Truck 4WD V10-8.0L VIN W HDC (2000)
Headlamp Relay: Description and Operation
The headlamp (or security) relay is a International Standards Organization (ISO) micro-relay. The terminal designations and functions are the same as a
conventional ISO relay. However, the micro-relay terminal orientation (or footprint) is different, current capacity is lower, and the relay case dimensions
are smaller than those of the conventional ISO relay.
The headlamp relay is a electromechanical device that switches battery current to the headlamps when the high-line or premium Central Timer Module (
CTM) grounds the relay coil. See Headlamp Relay in the Diagnosis and Testing for more information.
The headlamp (or security) relay is located in the Power Distribution Center (PDC) in the engine compartment. Refer to the PDC label for relay
identification and location.
The headlamp relay cannot be repaired and, if faulty or damaged, it must be replaced.
